重点 (八) : 经常使用代码集合

时间 2019-12-04

原文原文链接

CGRect

CGRect frame = CGRectMake (origin.x, origin.y, size.width, size.height);矩形NSStringFromCGRect(someCG) 把 CGRect 结构转变为格式化字符串; CGRectFromString(aString) 由字符串恢复出矩形;

CGRectInset(aRect) 建立较小或较大的矩形(中心点相同),+较小 -较大 CGRectIntersectsRect(rect1, rect2) 判断两矩形是否交叉,是否重叠 CGRectZero 高度和宽度为零的/位于(0,0)的矩形常量

CGPoint & CGSize

CGPoint aPoint = CGPointMake(x, y); CGSize aSize = CGSizeMake(width, height);

设置透明度

[myView setAlpha:value]; (0.0 < value < 1.0)

设置背景色

[myView setBackgroundColor:[UIColor redColor]];

(blackColor;darkGrayColor;lightGrayColor; whiteColor;grayColor; redColor; greenColor; blueColor; cyanColor;yellowColor; magentaColor;orangeColor;purpleColor; brownColor; clearColor; )

自定义颜色

UIColor *newColor = [[UIColor alloc]

initWithRed:(float) green:(float) blue:(float) alpha:(float)];

0.0~1.0

竖屏

320X480

横屏

480X320

状态栏高 (显示时间和网络状态) 20 像素

导航栏、工具栏高(返回) 44 像素

隐藏状态栏

[[UIApplication shareApplication] setStatusBarHidden: YES animated:NO]

横屏

[[UIApplication shareApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight].

屏幕变更检测

orientation == UIInterfaceOrientationLandscapeLeft

全屏

window=[[UIWindow alloc] initWithFrame:[UIScreen mainScreen] bounds];

自动适应父视图大小:

aView.autoresizingSubviews = YES;

aView.autoresizingMask = (UIViewAutoresizingFlexibleWidth |

UIViewAutoresizingFlexibleHeight);

定义按钮

UIButton *scaleUpButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [scaleUpButton setTitle:@"放大" forState:UIControlStateNormal]; scaleUpButton.frame = CGRectMake(40, 420, 100, 40);

[scaleUpButton addTarget:self

action:@selector(scaleUp) forControlEvents:UIControlEventTouchUpInside];

设置视图背景图片

UIImageView *aView;

[aView setImage:[UIImage imageNamed:@”name.png”]]; view1.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@"image1.png"]];

活动表单

- (IBActive) someButtonPressed:(id) sender {

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@”Are you sure?”

delegate:self

cancelButtonTitle:@”No way!” destructiveButtonTitle:@”Yes, I’m Sure!” otherButtonTitles:nil];

[actionSheet showInView:self.view];

[actionSheet release]; }

警告视图

- (void) actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger) buttonIndex

{

if(buttonIndex != [actionSheet cancelButtonIndex]) {

NSString *message = [[NSString alloc] initWithFormat:@”You can breathe easy, everything went OK.”];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Something was done”

[alert show]; [alert release]; [message release];

}

动画效果

-(void)doChange:(id)sender {

if(view2 == nil)

{

[self loadSec];

}

[UIView beginAnimations:nil context:NULL];

[UIView setAnimationDuration:1];

[UIView setAnimationTransition:([view1 superview]?UIViewAnimationTransitionFlipFromLeft:UIViewAnimationTransitionFlipFromRigh t)forView:self.view cache:YES];

if([view1 superview]!= nil) {

[view1 removeFromSuperview]; [self.view addSubview:view2];

}else {

[view2 removeFromSuperview]; [self.view addSubview:view1]; }

[UIView commitAnimations];

}

Table View <UITableViewDateSource> #pragma mark -

#pragma mark Table View Data Source Methods //指定分区中的行数,默认为 1

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return [self.listData count]; }

设置每一行 cell 显示的内容

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

static NSString *SimpleTableIndentifier = @"SimpleTableIndentifier"; UITableViewCell *cell = dequeueReusableCellWithIdentifier:SimpleTableIndentifier];

if (cell == nil) {

cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:SimpleTableIndentifier]

autorelease];

}

UIImage *image = [UIImage imageNamed:@"13.gif"]; cell.imageView.image = image;

[tableView

NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row];

cell.textLabel.font = [UIFont boldSystemFontOfSize:20];

if(row < 5)

cell.detailTextLabel.text = @"Best friends"; else

cell.detailTextLabel.text = @"friends"; return cell;

}

判断邮箱格式是否正确的代码

利用正则表达式验证

-(BOOL)isValidateEmail:(NSString *)email

{

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];

return [emailTest evaluateWithObject:email];

}

图片压缩

用法：UIImage *yourImage= [selfimageWithImageSimple:image scaledToSize:CGSizeMake(210.0, 210.0)];

压缩图片

- (UIImage*)imageWithImageSimple:(UIImage*)image scaledToSize:(CGSize)newSize

{

Create a graphics image context

UIGraphicsBeginImageContext(newSize);

Tell the old image to draw in this newcontext, with the desired

new size

[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];

Get the new image from the context

UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();

End the context

UIGraphicsEndImageContext();

Return the new image.

return newImage;

}

亲测可用的图片上传代码

- (IBAction)uploadButton:(id)sender {

UIImage *image = [UIImage imageNamed:@"1.jpg"]; 图片名

NSData *imageData = UIImageJPEGRepresentation(image,0.5);压缩比例

NSLog(@"字节数:%i",[imageData length]);

post url

NSString *urlString = @" http://192.168.1.113:8090/text/UploadServlet";

服务器地址

setting up the request object now

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init] ;

[request setURL:[NSURL URLWithString:urlString]];

[request setHTTPMethod:@"POST"];

NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];

NSString *contentType = [NSString stringWithFormat:@"multipart/form-data;boundary=%@",boundary];

[request addValue:contentType forHTTPHeaderField: @"Content-Type"];

NSMutableData *body = [NSMutableData data];

[body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithString:@"Content-Disposition:form-data; name=\"userfile\"; filename=\"2.png\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; 上传上去的图片名字

[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[NSData dataWithData:imageData]];

[body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

[request setHTTPBody:body];

NSLog(@"1-body:%@",body);

NSLog(@"2-request:%@",request);

NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

NSLog(@"3-测试输出：%@",returnString);

给imageView加载图片

UIImage *myImage = [UIImage imageNamed:@"1.jpg"];

[imageView setImage:myImage];

[self.view addSubview:imageView];

对图库的操做

选择相册：

UIImagePickerControllerSourceTypesourceType=UIImagePickerControllerSourceTypeCamera;

if (![UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

sourceType=UIImagePickerControllerSourceTypePhotoLibrary;

}

UIImagePickerController * picker = [[UIImagePickerControlleralloc]init];

picker.delegate = self;

picker.allowsEditing=YES;

picker.sourceType=sourceType;

[self presentModalViewController:picker animated:YES];

选择完毕：

-(void)imagePickerController:(UIImagePickerController*)pickerdidFinishPickingMediaWithInfo:(NSDictionary *)info

{

[picker dismissModalViewControllerAnimated:YES];

UIImage * image=[info objectForKey:UIImagePickerControllerEditedImage];

[self performSelector:@selector(selectPic:) withObject:imageafterDelay:0.1];

}

-(void)selectPic:(UIImage*)image

{

NSLog(@"image%@",image);

imageView = [[UIImageView alloc] initWithImage:image];

imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height);

[self.viewaddSubview:imageView];

[self performSelectorInBackground:@selector(detect:) withObject:nil];

}

detect为本身定义的方法，编辑选取照片后要实现的效果

取消选择：

-(void)imagePickerControllerDIdCancel:(UIImagePickerController*)picker

{

[picker dismissModalViewControllerAnimated:YES];

}

跳到下个View

nextWebView = [[WEBViewController alloc] initWithNibName:@"WEBViewController" bundle:nil];

[self presentModalViewController:nextWebView animated:YES];

建立一个UIBarButtonItem右边按钮

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右边"style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];

[self.navigationItem setRightBarButtonItem:rightButton];

设置navigationBar隐藏

self.navigationController.navigationBarHidden = YES;

iOS开发之UIlabel多行文字自动换行（自动折行）

UIView *footerView = [[UIView alloc]initWithFrame:CGRectMake(10, 100, 300, 180)];

UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(10, 100, 300, 150)];

label.text = @"Hello world! Hello world!Hello world! Hello world! Hello world! Hello world! !";

背景颜色为红色

label.backgroundColor = [UIColor redColor];

设置字体颜色为白色

label.textColor = [UIColor whiteColor];

文字居中显示

label.textAlignment = UITextAlignmentCenter;

自动折行设置

label.lineBreakMode = UILineBreakModeWordWrap;

label.numberOfLines = 0;

代码生成button

CGRect frame = CGRectMake(0, 400, 72.0, 37.0);

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

button.frame = frame;

[button setTitle:@"新添加的按钮" forState: UIControlStateNormal];

button.backgroundColor = [UIColor clearColor];

button.tag = 2000;

[button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

让某个控件在View的中心位置显示

（某个控件，好比label，View）label.center = self.view.center;

好看的文字处理

以tableView中cell的textLabel为例子：

cell.backgroundColor = [UIColorscrollViewTexturedBackgroundColor];

设置文字的字体

cell.textLabel.font = [UIFont fontWithName:@"AmericanTypewriter" size:100.0f];

设置文字的颜色

cell.textLabel.textColor = [UIColor orangeColor];

设置文字的背景颜色

cell.textLabel.shadowColor = [UIColor whiteColor];

设置文字的显示位置

cell.textLabel.textAlignment = UITextAlignmentCenter;

隐藏Status Bar

读者可能知道一个简易的方法,那就是在程序的viewDidLoad中加入

[[UIApplication sharedApplication]setStatusBarHidden:YES animated:NO];

更改AlertView背景

UIAlertView *theAlert = [[[UIAlertViewalloc] initWithTitle:@"Atention"

message: @"I'm a Chinese!"

delegate:nil

cancelButtonTitle:@"Cancel"

otherButtonTitles:@"Okay",nil] autorelease];

[theAlert show];

UIImage *theImage = [UIImageimageNamed:@"loveChina.png"];

theImage = [theImage stretchableImageWithLeftCapWidth:0topCapHeight:0];

CGSize theSize = [theAlert frame].size;

UIGraphicsBeginImageContext(theSize);

[theImage drawInRect:CGRectMake(5, 5, theSize.width-10, theSize.height-20)];这个地方的大小要本身调

整，以适应alertview的背景颜色的大小。

theImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

theAlert.layer.contents = (id)[theImage CGImage];

键盘透明

textField.keyboardAppearance = UIKeyboardAppearanceAlert;

状态栏的网络活动风火轮是否旋转

[UIApplication sharedApplication].networkActivityIndicatorVisible，默认值是NO。

截取屏幕图片

建立一个基于位图的图形上下文并指定大小为CGSizeMake(200,400)

UIGraphicsBeginImageContext(CGSizeMake(200,400));

renderInContext 呈现接受者及其子范围到指定的上下文

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

返回一个基于当前图形上下文的图片

UIImage *aImage = UIGraphicsGetImageFromCurrentImageContext();

移除栈顶的基于当前位图的图形上下文

UIGraphicsEndImageContext();

以png格式返回指定图片的数据

imageData = UIImagePNGRepresentation(aImage);

更改cell选中的背景

UIView *myview = [[UIView alloc] init];

myview.frame = CGRectMake(0, 0, 320, 47);

myview.backgroundColor = [UIColorcolorWithPatternImage:[UIImage imageNamed:@"0006.png"]];

cell.selectedBackgroundView = myview;

显示图像

CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);

UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];

[myImage setImage:[UIImage imageNamed:@"myImage.png"]];

myImage.opaque = YES; opaque是否透明

[self.view addSubview:myImage];

能让图片适应框的大小（待确认）

NSString*imagePath = [[NSBundle mainBundle] pathForResource:@"XcodeCrash"ofType:@"png"];

UIImage *image = [[UIImage alloc]initWithContentsOfFile:imagePath];

UIImage *newImage= [image transformWidth:80.f height:240.f];

UIImageView *imageView = [[UIImageView alloc]initWithImage:newImage];

[newImagerelease];

[image release];

[self.view addSubview:imageView];

实现点击图片进行跳转的代码：生成一个带有背景图片的button，给button绑定想要的事件！

UIButton *imgButton=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 120, 120)];

[imgButton setBackgroundImage:(UIImage *)[self.imgArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];

imgButton.tag=[indexPath row];

[imgButton addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

多线程和结束后的更新UI操做

dispatch_async(dispatch_get_global_queue(0, 0), ^{

耗时操做

dispatch_async(dispatch_get_main_queue(), ^{

更新UI操做

});

修改PlaceHolder的默认颜色

[username_text setValue:[UIColor colorWithRed:1 green:1 blue:1 alpha:0.5] forKeyPath:@"_placeholderLabel.textColor"];

页面上移解决文本框被键盘弹出挡住的问题

textfield的函数

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

[username_text resignFirstResponder];

[password_text resignFirstResponder];

When the user presses return, take focus away from the text field so that the keyboard is dismissed.

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyboard" context:nil];

[UIView setAnimationDuration:animationDuration];

CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);

self.view.frame = rect;

[UIView commitAnimations];

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

When the user presses return, take focus away from the text field so that the keyboard is dismissed.

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyboard" context:nil];

[UIView setAnimationDuration:animationDuration];

CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);

self.view.frame = rect;

[UIView commitAnimations];

[textField resignFirstResponder];

return YES;

}

- (void)textFieldDidBeginEditing:(UITextField *)textField

{

CGRect frame = password_text.frame;

int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0);//键盘高度216

NSTimeInterval animationDuration = 0.30f;

[UIView beginAnimations:@"ResizeForKeyBoard" context:nil];

[UIView setAnimationDuration:animationDuration];

float width = self.view.frame.size.width;

float height = self.view.frame.size.height;

if(offset > 0)

{

CGRect rect = CGRectMake(0.0f, -offset,width,height);

self.view.frame = rect;

}

[UIView commitAnimations];

}

iOS代码加密经常使用加密方式，常见的iOS代码加密经常使用加密方式算法包括MD5加密、AES加密、BASE64加密：

MD5 iOS代码加密

建立MD5类，代码以下

#import <Foundation/Foundation.h>

@interface CJMD5 : NSObject

+(NSString *)md5HexDigest:(NSString *)input;

@end

#import "CJMD5.h"

#import <CommonCrypto/CommonDigest.h>

@implementation CJMD5

+(NSString *)md5HexDigest:(NSString *)input{

const char* str = [input UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(str, strlen(str), result);

NSMutableString *ret = [NSMutableString stringWithCapacity:CC_MD5_DIGEST_LENGTH];

for(int i = 0; i<CC_MD5_DIGEST_LENGTH; i++) {

[ret appendFormat:@"%02X",result];

}

return ret;

}

@end

MD5是不可逆的只有加密没有解密，iOS代码加密使用方式以下

NSString *userName = @"cerastes";

NSString *password = @"hello Word";

MD5加密

NSString *md5 = [CJMD5 md5HexDigest:password];

NSLog(@"%@",md5);

END

AES加密iOS代码加密

AES加密iOS代码加密使用方法

AES加密

NSString *encryptedData = [AESCrypt encrypt:userName password:password];加密

NSString *message = [AESCrypt decrypt:encryptedData password:password]; 解密

NSLog(@"加密结果 = %@",encryptedData);

NSLog(@"解密结果 = %@",message);

END

BASE64加密iOS代码加密

BASE64加密iOS代码加密添加以下方法

+ (NSString*)encodeBase64String:(NSString *)input;

+ (NSString*)decodeBase64String:(NSString *)input;

+ (NSString*)encodeBase64Data:(NSData *)data;

+ (NSString*)decodeBase64Data:(NSData *)data;

+ (NSString*)encodeBase64String:(NSString * )input {

NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

data = [GTMBase64 encodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)decodeBase64String:(NSString * )input {

NSData *data = [input dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

data = [GTMBase64 decodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)encodeBase64Data:(NSData *)data {

data = [GTMBase64 encodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

+ (NSString*)decodeBase64Data:(NSData *)data {

data = [GTMBase64 decodeData:data];

NSString *base64String = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

return base64String;

}

BASE64加密iOS代码加密使用方法

BASE64加密

NSString *baseEncodeString = [GTMBase64 encodeBase64String:password];

NSString *baseDecodeString = [GTMBase64 decodeBase64String:baseEncodeString];

NSLog(@"baseEncodeString = %@",baseEncodeString);

NSLog(@"baseDecodeString = %@",baseDecodeString);

RSA加密：

RSA是目前最有影响力的公钥加密算法，它可以抵抗到目前为止已知的绝大多数密码攻击，已被ISO推荐为公钥数据加密标准。

RSA公开密钥密码体制。所谓的公开密钥密码体制就是使用不一样的加密密钥与解密密钥，是一种“由已知加密密钥推导出解密密钥在计算上是不可行的”密码体制。

一般是先生成一对RSA 密钥，其中之一是保密密钥，由用户保存；另外一个为公开密钥，可对外公开，甚至可在网络服务器中注册。为提升保密强度，RSA密钥至少为500位长，通常推荐使用1024位。这就使加密的计算量很大。为减小计算量，在传送信息时，常采用传统加密方法与公开密钥加密方法相结合的方式，即信息采用改进的DES或IDEA对话密钥加密，而后使用RSA密钥加密对话密钥和信息摘要。对方收到信息后，用不一样的密钥解密并可核对信息摘要。

RSA算法是第一个能同时用于加密和数字签名的算法，也易于理解和操做。RSA是被研究得最普遍的公钥算法.

RSA算法是一种非对称密码算法，所谓非对称，就是指该算法须要一对密钥，使用其中一个加密，则须要用另外一个才能解密。

RSA的算法涉及三个参数，n、e一、e2。

其中，n是两个大质数p、q的积，n的二进制表示时所占用的位数，就是所谓的密钥长度。

e1和e2是一对相关的值，e1能够任意取，但要求e1与(p-1）*(q-1）互质；再选择e2，要求（e2*e1）mod((p-1）*(q-1））=1。

（n，e1）,(n，e2）就是密钥对。其中(n，e1）为公钥，(n，e2）为私钥。[1]

RSA加解密的算法彻底相同，设A为明文，B为密文，则：A=B^e2 mod n；B=A^e1 mod n；（公钥加密体制中，通常用公钥加密，私钥解密）

e1和e2能够互换使用，即：

A=B^e1 mod n；B=A^e2 mod n;

1）本地数据加密

对NSUserDefaults，sqlite存储文件数据加密，保护账号和关键信息。）URL编码加密

对程序中出现的URL进行编码加密，防止URL被静态分析

2）网络传输数据加密

对客户端传输数据提供加密方案，有效防止经过网络接口的拦截获取

3）方法体，方法名高级混淆

对应用程序的方法名和方法体进行混淆，保证源码被逆向后没法解析代码

4）程序结构混排加密

对应用程序逻辑结构进行打乱混排，保证源码可读性降到最低

返回指定范围的随机数(m-n之间)的公式

Math.random()*(n-m)+m

防止被Iframe嵌套

if(top != self){

location.href = ”about:blank”;

}

/**

* HTTP GET 请求

**/

+(NSData *) doHttpGet:(NSString *)url

{

NSURL *uri = [NSURL URLWithString:url];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:uri];

[request setHTTPMethod: @"GET" ];

NSData *returnData = [NSURLConnection sendSynchronousRequest: request returningResponse: nil error: nil];

return returnData;

}

/**

* HTTP POST请求

**/

+(NSData *) doHttpPost:(NSString *)url withString:(NSString *)param

{

NSData *data = nil;

if(param != nil && [param isEqualToString:@""] == NO){

param = [param stringByAddingPercentEscapesUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

data = [param dataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

}

//调用withParam NSData*类型的方法.

return [self doHttpPost:url withParam:data];

}

/**

* HTTP POST请求

**/

+(NSData *) doHttpPost:(NSString *)url withParam:(NSData *)param

{

新建请求

NSURL *uri = [NSURL URLWithString:url];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:uri cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:40.0];

设置请求参数

[request setHTTPMethod:@"POST"];

[request addValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

if(param != nil)

[request setHTTPBody:param];

打开访问网络的状态提示

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

请求连接

NSError *error = nil;

NSData *retData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

NSLog(@"%d: %@", error.code, error.description);

关闭访问网络的状态提示

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

返回结果

return retData;

}

/**

* 获取网络图片

**/

+(UIImage *) getImageFromUrl:(NSString *)url

{

if(url == nil || [url isEqualToString:@""]){

return nil;

}

url = StringByTrimWhiteSpace(url);

NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:url]];

UIImage *image =[[UIImage alloc] initWithData:imageData];

return image;

}

/**

* 获取网络图片的内容

**/

+(NSData *)getImageDataFromUrl:(NSString *)url

{

if(url == nil || [url isEqualToString:@""]){

return nil;

}

NSData *imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:url]];

return imageData;

}

#pragma mark - 字符串处理

/**

* 利用正则表达示获取字符串的匹配结果

**/

+(NSString *) getRegExpressResult:(NSString *)source regExp:(NSString *)regExp

{

NSString *temp = [NSString stringWithFormat:@"%@", source];

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

if (regex != nil) {

NSTextCheckingResult *firstMatch = [regex firstMatchInString:temp options:0 range:NSMakeRange(0, [temp length])];

if (firstMatch) {

NSRange resultRange = [firstMatch rangeAtIndex:0];

截取数据

NSString *result = [temp substringWithRange:resultRange];

返回结果

return result;

}

return @"";

}

/**

* 匹配字符串中整个HTML标记的内容

**/

+(NSString *) getHtmlText:(NSString *)source tagName:(NSString *)tag

{

NSString *regexp = [NSString stringWithFormat:@"<\\s*%@\\s+([^>]*)\\s*>([^/%@>]*</%@>)?", tag, tag, tag];

return [BaseFunction getRegExpressResult:source regExp:regexp];

}

/**

* 匹配HTML标记内容中的属性值

**/

+(NSString *) getHtmlTagAttr:(NSString *)tagContext attrName:(NSString *)attr

{

NSString *regexp = [NSString stringWithFormat: @"%@\\s*=\\s*?(['\"][^'\"]*?)['\"]", attr];

NSString *result = [BaseFunction getRegExpressResult:tagContext regExp:regexp];

替换

NSString *oldstr = [NSString stringWithFormat:@"%@=\"", attr];

NSString *newstr = [result stringByReplacingOccurrencesOfString:oldstr withString:@""];

newstr = [newstr substringToIndex:[newstr length] - 1];

return newstr;

}

/**

* 获取HTML标记的文本

**/

+(NSString *) getHTmlTagText:(NSString *)tagContext

{

NSString *regExp = @"<\\s*\\w+\\s+([^>]*)\\s*>";

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

NSTextCheckingResult *firstMatch = [regex firstMatchInString:tagContext options:0 range:NSMakeRange(0, [tagContext length])];

NSRange resultRange = [firstMatch rangeAtIndex:0];

NSString *newStr = [tagContext substringFromIndex:resultRange.length];

regExp = @"</\\w+\\s*>";

regex = [NSRegularExpression regularExpressionWithPattern:regExp options:NSRegularExpressionCaseInsensitive error:nil];

firstMatch = [regex firstMatchInString:newStr options:0 range:NSMakeRange(0, [newStr length])];

resultRange = [firstMatch rangeAtIndex:0];

return [newStr substringToIndex:resultRange.location];

}

/**

* 替换HTML标签

**/

+(NSString *) replaceHtmlTag:(NSString *)source

{

source = [BaseFunction replaceString:source byRegexp:@"<[^>]+>"];

return [BaseFunction replaceString:source byRegexp:@"</[^>]+>"];

}

+(NSString *) replaceString:(NSString *)source byRegexp:(NSString *)exp

{

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:exp options:0 error:nil];

if(regex == nil)

return source;

NSString *ret = [NSString stringWithFormat:@"%@", source];

NSArray *array = [regex matchesInString:ret options:NSMatchingReportProgress range:NSMakeRange(0, [ret length])];

for(int i = (int)[array count] - 1; i >= 0; i--)

{

NSTextCheckingResult *tcr = [array objectAtIndex:i];

NSRange range = [tcr range];

ret = [ret stringByReplacingCharactersInRange:range withString:@""];

}

return ret;

}

/**

* 正则验证

**/

+(BOOL) string:(NSString *)source MatchRegex:(NSString *) exp

{

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", exp];

return [predicate evaluateWithObject:source];

}

/**

* 获取正则表达式中匹配的个数

**/

+ (NSInteger) getMatchCount:(NSString *)text inRegx:(NSString *)exp

{

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:exp options:0 error:nil];

int count = 0;

if (regex != nil) {

NSArray *array = [regex matchesInString:text options:NSMatchingReportProgress range:NSMakeRange(0, [text length])];

for(int i=0; i< [array count]; i++)

{

NSTextCheckingResult *tcr = [array objectAtIndex:i];

NSRange range = [tcr range];

count += range.length;

}

return count;

}

/**

* 替换XML敏感字符

**/

+ (NSString *) replaceXMLSensitiveLettler:(NSString *)text

{

NSString *tmp = [text stringByReplacingOccurrencesOfString:@"&" withString:@"&"];

tmp = [tmp stringByReplacingOccurrencesOfString:@"<" withString:@"<"];

tmp = [tmp stringByReplacingOccurrencesOfString:@">" withString:@">"];

return tmp;

}

/**

* 分离坐标

**/

+(void) separateCoordinate:(NSString *)coord lat:(NSString **)lat lng:(NSString **)lng

{

*lng = @"", *lat = @"";

验证数据的合法性

if(coord == nil){ return; }

coord = StringByTrimWhiteSpace(coord);

if(IsStringEmpty(coord)){

return;

}

将坐标分开

NSArray *coordArray = [coord componentsSeparatedByString:@","];

if([coordArray count]>0)

*lng = [coordArray objectAtIndex:0];

if([coordArray count]>1)

*lat = [coordArray objectAtIndex:1];

}

/**

* 从文件路径中分解出文件名

**/

+ (NSString *) splitFileNameForPath:(NSString *)filePath

{

NSArray *array = [filePath componentsSeparatedByString:@"/"];

return [array lastObject];

}

/**

* 从文件路径中分解出文件的扩展名

**/

+ (NSString *) getFileExtension:(NSString *)filePath

{

NSString *fileName = [self splitFileNameForPath:filePath];

NSArray *array = [fileName componentsSeparatedByString:@"."];

return [NSString stringWithFormat:@".%@",[array lastObject]];

}

/**

* 获取设备型号

**/

+ (NSString *) platform

{

size_t size;

sysctlbyname("hw.machine", NULL, &size, NULL, 0);

char *machine = (char *)malloc(size);

sysctlbyname("hw.machine", machine, &size, NULL, 0);

NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];

free(machine);

NSRange range = [platform rangeOfString:@","];

return [platform substringToIndex:range.location];

}

/**

* MD5加密

**/

+ (NSString *)md5Digest:(NSString *)str {

const char *cStr = [str UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(cStr, (CC_LONG)strlen(cStr), result); // This is the md5 call

NSMutableString *md5Result = [[NSMutableString alloc] init];

for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {

[md5Result appendFormat:@"%02x", result[i]];

}

return md5Result;

return [NSString stringWithFormat:

@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",

result[0], result[1], result[2], result[3],

result[4], result[5], result[6], result[7],

result[8], result[9], result[10], result[11],

result[12], result[13], result[14], result[15]];

}

+ (NSString *)SHA1:(NSString *)str {

const char *cStr = [str UTF8String];

NSData *data = [NSData dataWithBytes:cStr length:str.length];

uint8_t digest[CC_SHA1_DIGEST_LENGTH];

CC_SHA1(data.bytes, (CC_LONG)data.length, digest);

NSMutableString *result = [[NSMutableString alloc] init];

for(int i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {

[result appendFormat:@"%02x", digest[i]];

}

return result;

}

判断是否为整形

+ (BOOL)isPureInt:(NSString *)string{

NSScanner* scan = [NSScanner scannerWithString:string];

int val;

return [scan scanInt:&val] && [scan isAtEnd];

}

判断是否为浮点形

+ (BOOL)isPureFloat:(NSString *)string{

NSScanner* scan = [NSScanner scannerWithString:string];

float val;

return [scan scanFloat:&val] && [scan isAtEnd];

}

/**

* 版本比较

**/

+ (BOOL)isVersion:(NSString*)versionA biggerThanVersion:(NSString*)versionB

{

NSArray *arrayNow = [versionB componentsSeparatedByString:@"."];

NSArray *arrayNew = [versionA componentsSeparatedByString:@"."];

BOOL isBigger = NO;

NSInteger i = arrayNew.count > arrayNow.count? arrayNow.count : arrayNew.count;

NSInteger j = 0;

BOOL hasResult = NO;

for (j = 0; j < i; j ++) {

NSString* strNew = [arrayNew objectAtIndex:j];

NSString* strNow = [arrayNow objectAtIndex:j];

if ([strNew integerValue] > [strNow integerValue]) {

hasResult = YES;

isBigger = YES;

break;

}

if ([strNew integerValue] < [strNow integerValue]) {

hasResult = YES;

isBigger = NO;

break;

}

if (!hasResult) {

if (arrayNew.count > arrayNow.count) {

NSInteger nTmp = 0;

NSInteger k = 0;

for (k = arrayNow.count; k < arrayNew.count; k++) {

nTmp += [[arrayNew objectAtIndex:k]integerValue];

}

if (nTmp > 0) {

isBigger = YES;

}

return isBigger;

}

Reveal使用

1. Build Settings 搜索Other

将Other Linker Flags设置为 -ObjC

2.Reveal.framework拖到项目中便可

~/资源库/Caches/

找到com.ittybittyapps.Reveal文件夹删除

~/资源库/Preferences/

找到com.ittybittyapps.Reveal.plist删除

又可使用30天

UILabel设置多种字体、颜色

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"Using NSAttributed String，try your best to test attributed string text"];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:NSMakeRange(0,5)];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(6,12)];

[str addAttribute:NSForegroundColorAttributeName value:[UIColor greenColor] range:NSMakeRange(19,6)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(0, 5)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(6, 12)];

[str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Arial" size:30.0] range:NSMakeRange(19, 6)];

UILabel *attrLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 150, 320 - 40, 90)];

attrLabel.attributedText = str;

attrLabel.numberOfLines = 0;

[self.view addSubview:attrLabel];

iOS 调试方法（利用lldb）

po _image 能够看到_imge 的信息

模拟器安装app

xcrun simctl install booted +APP的路径

文本框键盘遮挡问题

UINavigationControllerDelegate

_niChenText.delegate=self;

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];

[[NSNotificationCenterdefaultCenter]addObserver:selfselector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotificationobject:nil];

@property (strong,nonatomic)UITextField *SelectTextField;

键盘显示事件

- (void) keyboardWillShow:(NSNotification *)notification {

获取键盘高度，在不一样设备上，以及中英文下是不一样的

CGFloat kbHeight = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size.height;

计算出键盘顶端到inputTextView panel底端的距离(加上自定义的缓冲距离INTERVAL_KEYBOARD)

CGFloat offset = (_SelectTextField.frame.origin.y+_SelectTextField.frame.size.height+50) - (self.view.frame.size.height - kbHeight);

取得键盘的动画时间，这样能够在视图上移的时候更连贯

double duration = [[notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

将视图上移计算好的偏移

if(offset > 0) {

[UIView animateWithDuration:duration animations:^{

self.view.frame = CGRectMake(0.0f, -offset, self.view.frame.size.width, self.view.frame.size.height);

}];

}

键盘消失事件

- (void) keyboardWillHide:(NSNotification *)notify {

键盘动画时间

double duration = [[notify.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];

视图下沉恢复原状

[UIView animateWithDuration:duration animations:^{

self.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

}];

}

- (void)textFieldDidBeginEditing:(UITextField *)textField{

_SelectTextField=textField;

}

-(BOOL)textFieldShouldReturn:(UITextField *)textField

{

[textField resignFirstResponder];

return YES;

}

图片拉神

UIImage * resizeImage=[normal resizableImageWithCapInsets:UIEdgeInsetsMake(h, w, h, w)];

背景单击事件

@interface LCTianJianDiZhiController ()<HZAreaPickerDelegate,UIGestureRecognizerDelegate>

UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backGroundOnclick)];

tapGestureRecognize.delegate = self;

[self.view addGestureRecognizer:tapGestureRecognize];

-(void)backGroundOnclick

{

[_selectDiQu setTitle:@"选择" forState:UIControlStateNormal];

[self.view endEditing:YES];

[self cancelLocatePicker];

}

如下状况不能交互

alpha<0.01

hidden=yes

userInteracion=no

父视图不容许交换，子视图也不能

在父图可见范围内能够交换，范围以外不能交互

UiImageView 默认不容许用户交互

uitableviewcell 点击没有效果

cell.selectionStyle = UITableViewCellSelectionStyleNone;

隐藏导航栏

[self.navigationController setNavigationBarHidden:YES animated:NO];

隐藏标签栏

self.tabBarController.tabBar.hidden =YES;

时间戳转换为时间

NSString *str=[_mydata[indexPath.row]valueForKey:@"appr_comment_time"];时间戳

NSTimeInterval time=[str doubleValue]/1000+28800;由于时差问题要加8小时 == 28800 sec

NSDate *detaildate=[NSDate dateWithTimeIntervalSince1970:time];

NSLog(@"date:%@",[detaildate description]);

实例化一个NSDateFormatter对象

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

设定时间格式,这里能够设置成本身须要的格式

[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSString *currentDateStr = [dateFormatter stringFromDate: detaildate];

NSLog(@"%@",currentDateStr);

密码文本框secureTextEntry

把数据存储到本地

存储

获取userDefault单例

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

登录成功后把用户名和密码存储到UserDefault

[userDefaults setObject:_userName.text forKey:@"name"];

[userDefaults setObject:_password.text forKey:@"password"];

[userDefaults synchronize];

调用

获取UserDefault

NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

_userName.text= [userDefault objectForKey:@"name"];

_password.text= [userDefault objectForKey:@"password"];

页面切换的方式

从一个ViewController切换到另外一个ViewController有下面几种方法：

（1）addsubview方法切换视图

self.view addSubview:(加载的新页面);

相应的 [self.view removeFromSuperview];移除添加的view

（2）self.view insertSubview:(加载的新页面) atIndex:n;

对n的解释：页面都是层次叠加的，n表示加载到那一层上面

（3）presentModalViewController方法

photoNacController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

photoNacController.modalPresentationStyle = UIModalPresentationFullScreen;

selfpresentModalViewController:(加载的新页面) animated:

modalTransitionStyle用于设置页面切换的动画

modalPresentationStyle用于设置视图显示的方式

两种方法试试就知道用途了！

(4) pushViewController导航

[self.navigationController pushViewController:(加载的新页面) animated:YES];

对应的

[self.navigationController popViewControllerAnimated:YES];

总结：系统提供了咱们视图切换的方法以及视图切换的默认动画，咱们能够选择这几种方法中的去使用，也能够自定义切换的动画animation

/** 隐藏状态栏 */

- (BOOL)prefersStatusBarHidden

{

return YES;

}

调整边距，可让表格视图让开状态栏

self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0);

代删除线的UILabel

- (void)drawRect:(CGRect)rect {

Drawing code

[super drawRect:rect];

CGContextRef context=UIGraphicsGetCurrentContext();

CGContextMoveToPoint(context, 0, 8);

CGContextAddLineToPoint(context, rect.size.width, rect.size.height-5);

CGContextStrokePath(context);

}

从xib加载时若是不显示或出错就多是伸缩的问题

dropdown.autoresizingMask=UIViewAutoResizingNone;

unbutton 设置圆角边框

[huoQuYanZhenMa.layer setMasksToBounds:YES];

[huoQuYanZhenMa.layer setCornerRadius:10.0]; 设置矩形四个圆角半径

[huoQuYanZhenMa.layer setBorderWidth:1.0]; 边框宽度

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

CGColorRef colorref = CGColorCreate(colorSpace,(CGFloat[]){ 1, 0, 0, 1 });

[huoQuYanZhenMa.layer setBorderColor:colorref];边框颜色

[self.view addSubview:huoQuYanZhenMa];

界面跳转

- (void)pushAction{

PushViewController *pushVC = [[PushViewController alloc] init];

[self.navigationController pushViewController:pushVC animated:YES];

RootViewController *rootVC = (RootViewController *)self.tabBarController;

[rootVC showTabBar:NO];

[self.navigationController showViewController:<#(UIViewController *)#> sender:<#(id)#>]

}

- (void)presentAction{

ModalViewController *modalVC = [[ModalViewController alloc] init];

模态视图

[self presentViewController:modalVC animated:YES completion:nil];

}

- (void)dismissAction{

[self dismissViewControllerAnimated:YES completion:nil];

}

- (void)popAction{

[self.navigationController popViewControllerAnimated:YES];

}

UIStoryboard *stryBoard=[UIStoryboard storyboardWithName:@"Main" bundle:nil];

[self presentViewController:[stryBoard instantiateViewControllerWithIdentifier:@"mytabBarContol"] animated:NO completion:nil];

语法约定

方法首字母大小，单词切换用大写

类名要大写

初始化应用要initW～～，w必定要大些，而且前面必定是init才行；否则self＝［super init］会出错

打印结构体

NSLog(@“%@”,nSStringFromRange(range));

代理的做用

监听哪些不能用addTarget监听的事件

主要用来负责两个对象之间的消息传递

代理实现的步骤

（1）成为（子）控件的代理，父亲（控制器）成为儿子（文本框）的代理

（2）遵照协议，利用智能提示具体实现

代理的id应该用weak 弱引用，否则会照成循环引用

判断是否实现某个协议方法

if ([self.delegate respondsToSelector:@selector(tgFooterViewDidDowenLoadButton:)]) {

[self.delegate tgFooterViewDidDowenLoadButton:self];

}

代理模式：是父控件（视图控制器）监听子控件的事件，当子控件发生某些事情时通知父控件工做

footerView->controller 去工做，用代理

conterView->footerView去工做，直接调用用footView的方法

不要分割线

tabQQChat.separatorStyle=UITableViewCellSeparatorStyleNone;

内边距

_textView.contentEdgeInsets=UIEdgeInsetsMake(20, 20, 20, 20);

获取文本的宽高

正文

CGFloat textX;

CGFloat textY=iconY;

CGSize textmaxSize= CGSizeMake(150, MAXFLOAT);

CGSize textRealSizw=[message.text boundingRectWithSize:textmaxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:15.0f]} context:nil].size;

模型中数据中文乱码

对象描述方法，相似toStrong

-(NSString *)description

{

return [NSString stringWithFormat:@"=<%@: %p>{answer: %@,icon:%@,title:%@,option:%@}",self.class,self ,self.answer,self.icon,self.title,self.options];

}

而后在viewDidLoad中

NSLog(@"%@",self.question);

而后导入NSArray＋Log.h

改变状态栏的颜色

-(UIStatusBarStyle)preferredStatusBarStyle

{

return UIStatusBarStyleLightContent;

}

隐藏返回按钮文字

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)

forBarMetrics:UIBarMetricsDefault];

uitableVIew的背景图片

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"leftMenu.jpg"]];

self.tableView.backgroundView = imageView;

分割线

self.tableView.separatorStyle=UITableViewCellSeparatorStyleLSingleLine;

删除多余的分割线

self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];//tableView删除多余的分割线

- (void)setExtraCellLineHidden: (UITableView *)tableView

{

UIView *view = [UIView new];

view.backgroundColor = [UIColor clearColor];

[tableView setTableFooterView:view];

}

Cell中的代理方法

/**

初始化方法

使用代码建立Cell的时候会被调用，若是使用XIB或者Storyboard，此方法不会被调用

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier

/**

从XIB被加载以后，会自动被调用，若是使用纯代码，不会被执行

- (void)awakeFromNib

Cell 被选中或者取消选中是都会被调用

若是是自定义Cell控件，全部的子控件都应该添加到contentView中

- (void)setSelected:(BOOL)selected animated:(BOOL)animated

UIView的经常使用方法：

－（void）addSubview:(UIVIew *)view;添加一个子控件

－（void）removeFromSuperview; 从父控件中移除

－（UIView *）viewWithTag:(NSInteger)tag;根据tag表示寻找到对应的控件（通常是用于寻找子控件）

加载xib文件：

NSArray *array=[[NSBundle mainBundle] loadNibName:@“HMAppView”owne:nil options:nil];

UIView *view=[array firstObject];

计算给定文本字符串

UILabel要换行就要给设置行为0；

_textView.numberOfLines=0;

boundingRectWithSize计算给定文本字符串所占的区域

返回值是一个x,y = 0的CGRect,w,h是计算好的宽高

若是要计算多行的准确高度，须要传入NSStringDrawingUsesLineFragmentOrigin选项

dict用于指定字体的相关属性的字典，UIKit框架中的第一个头文件

context: nil

NSDictionary *nameDict = @{NSFontAttributeName: kNameFont};

CGRect nameFrame = [self. status.name boundingRectWithSize:CGSizeMake(MAXFLOAT, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:nameDict context:nil];

nameFrame.origin.x = CGRectGetMaxX(self.iconView.frame) + padding;

nameFrame.origin.y = padding + (self.iconView.bounds.size.height - nameFrame.size.height) * 0.5;

self.nameView.frame = nameFrame;

代码块存放路径：

/Users/a625/Library/Developer/Xcode/UserData/CodeSnippets

uitableview继承自uiscrollview

须要知道共有多少行，每一行有多高才能计算出UIscrollview的高度

知道每一行的高度，就能够计算出每个屏幕显示多数航，才计算出表格明细方法的执行次数

tableview .rowhight 的效率比代理更高，若是行高同样就用属性，不同用代理

修改控件大小：

－（IBAction）top:(UIButton *)sender{

CGRect btnFrame=self.HeadBtn.Fram;

btnFrame.origin-=10;

self.headBtn.fram=btnFrame;

}

下面代码错误的，oc规定不容许直接修改对象的结构体属性的成员

self。headBtn.frmae.origin.y-＝10；

代码建立按钮：

1.建立一个自定义的按钮

UIButton *btn=[UIButton buttonWithTypeCustom];

2.添加按钮

[self.view addSubview:btn];

3.设置按钮的位置和尺寸

btn.frame=CGRectMake(100,100,100,100);

4.监听按钮的点击事件（点击按钮后就会调用self的btnClick方法）

[btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];

5.设置按钮在在默认状态下的属性

5.1默认状态下的背景

[btn setBackgroundImage:[UIImage imageName@“btn_01”] forState:UIControlStateNormal];

5.2.设置默认状态下的文字：千万不要用btn.titleLabel.text=@“sdsd”;

[btn setTitle:@“点我啊”forState:UIControlStateNormal];

5.3 默认状态的文字颜色

[btn setTitleColor:[UIColor redColor]forState:UIControlStateNormal];

6.设置按钮在高亮状态下的属性

6.1 高亮状态的背景

[btn setBackgroupImage:[UIImage imageName:@“btn_01”] forState:UIControlStateHighlighted];

6.2 高亮状态下的文字颜色

[btn setTitle:@“摸我干啥”forState:UIControlStateHighlighted];

6.3 高亮状态下文字颜色

[btn setTitleColor:[UIColor blueColor] forState:UIControlStateHightlighted];

修改按键的字体(titleLabel 是只读的 readonly 表示不容许修改titleLabel的指针)

btn.titleLabel.font=[UIFont sysTemFontOfsize 13];

sender.currentTitle 取出当前按钮的标题文字

CGRectGetMaxY（lable.frame）；

frame属性，通常不要修改，一般用于实例化控件，指定初始位置

若是须要改变控件大小，使用bounds

若是须要改变控件位置，使用center

@property

1.生成getter（）方法

2.生成setter（）方法

3生成带下划线的成员变量（纪录属性内容）

readonly的属性不会生成带下划线的成员变量

@synthesize 能够合成出来 @synthesize image＝_image;

代理的相关

1.遵照相关的协议，预先定义好方法，具体的实现工做有代理负责

<控件名称＋DataSource> 定义的数据有关的方法

<控件名称＋Delegate> 定义的与事件有关的方法，一般用来监听控件事件的

2.代理方法

1> 方面名以控件名称开口（没有前缀） ->方便程序员编写的时候快速找到须要的方法

2> 第一个参数是本身->意味着在协议方法中能够直接访问对象的属性，或者调用方法

3>代理方法的返回值->控制器向控件（委托）发送数据

内存管理：

控件：

若是是托线，用Weak

若是是代码，用Strong

NString 用copy

数字型的int 使用Assig

图片：

JPG:压缩比较高，一般用于照片，网页，有损压缩，解压缩时对cpu消耗大，意味慢，费电

PNG: 压缩比高，无损压缩，

UIScrollView

self.scrollView.contentInset=UIEdgeInsetsMake(20, 20, 20, 20);

self.scrollView.showsHorizontalScrollIndicator=NO;

self.scrollView.showsVerticalScrollIndicator=NO;

偏移位置

self.scrollView.contentOffset=CGPointMake(100, 100);

self.scrollView.bounces=NO;取消弹簧效果

contentSize 会根据边距调整offset

contentInset 不会调整offset

动画的两种方式：

1.头尾式

[UIView beginAnimations:nil context:nil];

/**须要执行的动画**/

[UIViewcommitAnimations];

2.Block式

[UIView animateWithDuration:0.5 animations:^{

/**须要执行动画的代码**/

}];

修改控件的位置和尺寸：

位置

frame.origin 原点

center 中心

尺寸：

frame.size

bounds.sizes

查看是否调用该函数

NSLog(“％@”，__func__);

在get方法中

，若是跟本身相关的用下划线，不相干的用self

字典转模型

-(NSArray)appList

{

if(appList==nil)

{

NSArray *array=[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] PathForResouce:@“app.plist” ofType:nil]];

建立一个临时数组

NSMutableArray *arrayM=[MSMutableArray array];

for(NSDictionary *dict in array)

{

HMAppInfo *appInfo=[[HMAppInfo alloc]init];

appInfo.name=dict[@“name”];

appInfo.icon =dict[@“icon”];

[arrayM oddObject:appInfo];

}

将临时数组复制给属性

_appList=arrayM;

}

return _appList;

}

使用时：

先实例化：HMAppInfo *appInfo=self.appList[i];

再使用： icon.image=[UIImage imageName:appInfo.icon];

UITextView 光标再也不最开始位置

self.automaticallyAdjustsScrollViewInsets = NO;

设置标签栏属性

UITabBarItem*item =self.tabBarController.tabBar.items[0];

UIImage*imageNomal = [[UIImage imageNamed:@"table_zhuye_off"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

item.image= imageNomal;

UIImage*imageSelected = [[UIImage imageNamed:@"table_zhuye_on"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

item.selectedImage= imageSelected;

self.tabBarController.tabBar.barTintColor = [UIColor whiteColor];

self.tabBarController.tabBar.translucent = false; 关闭透明

self.tabBarController.tabBar.tintColor = [UIColor colorWithRed:0.359 green:0.902 blue:0.296 alpha:1.000];

退出键盘

方法一：［self.textfield resigFirstResponder］;

方法二：[self.view endEditing:YES];Yes是否性关闭键盘

transform修改控件的位移（位置），缩放，旋转

建立一个transform属性相对初始

CGAffineTransForm CGAffineTransformMakeTransLation(CGFloat tx,CGFloat ty);左右移动

CGAffineTransForm CGAffineTransformMakeScale(CGFloat sx,CGFloat sy);放大缩小

CGAffineTransForm CGAffineTransformMakeRotaton(CGFloat angle); angle是弧度制，，排M_PI_4

在某个transform的基础上进行叠加

CGAffienTransForm CGAffienTransformTransSlate(CGAffienTransForm t,CGFloat tx.CGFloat ty);

CGAffienTransForm CGAffienTransFormScale(CGAffienTransform t , CGFloat sx,CGFloat sy);

CGAffienTransForm CgAffeinTransformRotate(CGAffienTransform t,CGFloat angle);

清空以前设置的transForm属性

view.transfrom=CGAffineTransformIdentity;

例：

self.butotn.transform=CGAffineTransForMakeTranslation(0,-100);向上平移100；

NSLog(@“%@”,NSStringFromCGAffineTRansfor(self.button.transform));

self.button.transform=CGAffineTransFormRotate(self.button.transform,-M_PI_4);//逆时针旋转45度

UIImage加载图片：

一个UIImage对象表明了一张图片，通常经过Image：@”图片名“加载图片（png格式的图片能够省略拓展名）

UIImage ＊image＝［UI image imageName：@“btn_01”］；

imageNamed :图像是实例化以后由系统负责，

String *path=[[NSBundle mainBundle] pathForResource:imageName];

可使用：UIImae *image=［UIImage imageWithContentsOfFile:path］；//可是不能放在images.xcassets

解析Plist文件

1.获取Plist文件路径

NSBundle *bundle=[NSBundle MianBundle];

NSString *path=[bundle pathForResource:@“imageData” ofType:@“plist”];

2.懒加载Plist文件

_image=[NSArray arrayWithContentOfFile:path];

-(NSArray *)image

{

if(_image==nil){

NSBundle *bundle=[NSBundle MianBundle];

NSString *path=[bundle pathForResource:@“imageData” ofType:@“plist”];

_image=[NSArray arrayWithContentOfFile:path];

}

return _image;

}

get（）懒加载

在get（）方法中不要在调用get（）方法了，self.btn是属于get（）方法,_btn 是变量名，不属于get（）方法

在懒加载中属于get（）方法，全部懒加载中不能出现self.btn~ 否则会出现死循环

时钟

scheduledTimerWithTimeInterval 方法本质上就是建立一个时钟，

添加到运行循环的模式是DefaultRunLoopMode

self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:@"hello timer" repeats:YES];

与1等价

self.timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

将timer添加到运行循环

模式：默认的运行循环模式

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];

self.timer = [NSTimer timerWithTimeInterval:1.0 target:self selector:@selector(updateTimer:) userInfo:nil repeats:YES];

将timer添加到运行循环

模式：NSRunLoopCommonModes的运行循环模式（监听滚动模式）

[[NSRunLoop currentRunLoop] addTimer:self.timer forMode:NSRunLoopCommonModes];

中止时钟

[self.timer invalidate];

枚举

枚举类型本质上是整数，定义的时候，若是指定了第一个整数值，而后后面的就会递增

枚举时解决魔法数字的很好工具

typedef enum｛

KmovingDirTop=10;

KmovingDirBottom;

KmovingDirLeft;

KmovingDirRigth

｝KmoingDir;

通知中心传值：

发送通知

[[NSNotificationCenter defaultCenter]postNotificationName:@"categoryDidChanged" object:nil userInfo:@{@"categoryModel":_seletedModel}];

接受：

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(categoryChange:) name:@"categoryDidChanged" object:nil];

- (void)categoryChange:(NSNotification*)noti{

CategoriyModel *md = (CategoriyModel*)noti.userInfo[@"categoryModel"];

NSString *str = noti.userInfo[@"subCategoryName"];

NSLog(@"左表：%@", md.name);

NSLog(@"右表：%@",str);

}

- (void)dealloc{

[[NSNotificationCenter defaultCenter]removeObserver:self];

}

UITableviewCell 更新

一个section刷新

NSIndexSet *indexSet=[[NSIndexSet alloc]initWithIndex:2];

[tableview reloadSections:indexSet withRowAnimation:UITableViewRowAnimationAutomatic];

一个cell刷新

NSIndexPath *indexPath=[NSIndexPath indexPathForRow:3 inSection:0];

[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

获取屏幕高度

#define kScreenWidth [UIScreen mainScreen].bounds.size.width

#define kScreenHeight [UIScreen mainScreen].bounds.size.height

生成随机数

arc4random_uniform(10) => 0~9之间的随机数

ARC 编译：

-fno-objc-arc

AFNetworking 的使用:

1.建立

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

2.指定解析器

manager 默认状况下是解析 json plist

xml 手动设置

manager.responseSerializer

manager.requestSerializer

aplication/json text/json

3.get/post 请求

接口地址 urlString

请求参数

网络请求成功后的回调 blocks

[manager GET:<#(NSString *)#> parameters:<#(id)#> success:^(AFHTTPRequestOperation *operation, id responseObject) {

成功后的操做

operation.resposeData

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

请求失败后的操做

NSLog(@"%@",error);

}];

post

[manager POST:url parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

发送后的回调

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

发送失败后的回调

}];

1. 网络下载数据而后把数据转为图片再加载

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"image/jpeg"];

[manager GET:imageURL parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {

NSLog(@"下载图片成功！");

iv.image = [UIImage imageWithData:operation.responseData];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@"%@",error);

}];

-(void)download{

&tag=1001011&telephone=18398850943&password=111111

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];

[manager GET:@" http://120.25.160.35:8080/LocalGoodBrand/UserServlet" parameters:

@{@"tag" : @"100111"}

success:^(AFHTTPRequestOperation *operation, id responseObject) {

NSString *string=[[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

NSData* jsonData=[string dataUsingEncoding:NSUTF8StringEncoding];

_dataArray= [NSJSONSerialization

JSONObjectWithData:jsonData

options:NSJSONReadingMutableContainers

error:nil];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@"Error: %@", error);

}];

}

SDWebImage的使用：

[iv sd_setImageWithURL:[NSURL URLWithString:imageURL]];

UITapGestureRecognizer *tapGestureRecognize = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(backGroundOnclick)];

tapGestureRecognize.delegate = self;

[self.view addGestureRecognizer:tapGestureRecognize];

删除storyboard：

1.删除storyboard

2.general 中删除“main”

2.info 中删除storyboard选项

3.屏幕初始化：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

self.window.backgroundColor = [UIColor whiteColor];

建立导航栏须要传入一个UICollectionViewController

FirstViewController *fvc = [[FirstViewController alloc]init];

MyNavController *nav = [[MyNavController alloc]initWithRootViewController:fvc];

self.window.rootViewController = nav;//

[self.window makeKeyAndVisible];

return YES;

}

按钮监听事件：

- (void)addtarget:(id)target action:(SEL)action{

[self.button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];

}

[first addtarget:self action:@selector(firstClick)];

#pragma mark - 点击事件

- (void)firstClick{

[self createPopver];

}

获取plist文件数据

获取plist文件地址

NSString *file = [[NSBundle mainBundle]pathForResource:@"categories.plist" ofType:nil];

加载plist为数组

NSArray *plistArray = [NSArray arrayWithContentsOfFile:file];

关闭popview 的自动适应屏幕属性：

pop.autoresizingMask = UIViewAutoresizingNone;

屏幕切换动态效果：

nav.modalPresentationStyle = UIModalPresentationFormSheet;

隐藏导航栏；

[self.navigationController setNavigationBarHidden:YES animated:YES];

设置tabbar的初始位置：

self.selectedIndex=button.1；

判断网络链接：

OOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

开启网络指示器

[[AFNetworkActivityIndicatorManager sharedManager] setEnabled:YES];

基准网站

NSURL *url = [NSURL URLWithString:@" http://baidu.com"];

监听结果回调

AFHTTPRequestOperationManager *manager = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:url];

NSOperationQueue *operationQueue = manager.operationQueue;

[manager.reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

switch (status) {

case AFNetworkReachabilityStatusReachableViaWWAN:

case AFNetworkReachabilityStatusReachableViaWiFi:

[operationQueue setSuspended:NO];

NSLog(@"有网络");

break;

case AFNetworkReachabilityStatusNotReachable:

default:

[operationQueue setSuspended:YES];

NSLog(@"无网络");

break;

}

}];

开始监听

[manager.reachabilityManager startMonitoring];

UILabel 自动换行和自适应

要想UI Label自动换行，line设置为0

1.N行彻底自适应：

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

testLabel.numberOfLines = 0; 至关于不限制行数

testLabel.text = txt;

这样不行，还须要调用 [testLabel sizeToFit];

2.限制在N行内自适应：

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

testLabel.numberOfLines = 3; 限制在3行内自适应

testLabel.text = txt;

[testLabel sizeToFit];

结果不起做用，所有在一行显示了。

3.为了实现2的需求，须要这么作：

CGSize maxSize = CGSizeMake(100, 21*3);

UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 100, 21)];

NSString *txt = @"dffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff";

CGSize labelSize = [txt sizeWithFont:testLabel.font constrainedToSize:maxSize lineBreakMode: UILineBreakModeTailTruncation];

testLabel.frame = CGRectMake(testLabel.frame.origin.x, testLabel.frame.origin.y, labelSize.width, labelSize.height);

testLabel.text = txt;

NSString：

建立一个字符串常量

NSString *string1 = @"hello";

string1 = @"hello world";

NSLog(@"%@",string1);

建立字符串

NSString *string2 = [[NSString alloc] initWithString:@"hello"];

initWithFormat：多个字符串拼接

NSString *string3 = [[NSString alloc] initWithFormat:@"hello %@",string2];

NSLog(@"string2 = %@",string2);

NSLog(@"string3 = %@",string3);

NSString *ss1 = [[NSString alloc] initWithFormat:@"ZHANGsan"];

NSString *ss2 = [[NSString alloc] initWithFormat:@"zhangsan"];

NSLog(@"[ss1 caseInsensitiveCompare:ss2]:%ld",[ss1 caseInsensitiveCompare:ss2]);

建立空的字符串

NSString *string4 = [[NSString alloc] init]; //等价于string4 = @"";

stringWithFormat：使用类方法建立字符串对象

NSString *string5 = [NSString stringWithString:@"hello"]; //等价于string5 = @"hello";

NSString *string6 = [NSString stringWithFormat:@"hello %@",@"world"];

使用格式化符拼接数值

int number = 101;

NSString *string7 = [NSString stringWithFormat:@"class:%d",number];

NSLog(@"string7=%@",string7);

字符串的比较

NSString *s0 = @"Ediosn";

NSString *s11 = @"Edison"; //s0与s11的指针地址是同样的，指向的都是常量区同一个字符串对象

NSString *s1 = [NSString stringWithFormat:@"Ediosn"];

NSString *s2 = [[NSString alloc] initWithFormat:@“Ediosn"];

判断s1与s2的指针地址是否相等

if (s0 == s2) { 不相等，由于是两个对象，指针地址不同

NSLog(@"s0 == s2");

}

isEqualToString: 是比较两个字符串内容是否相同

if ([s0 isEqualToString:s2]) {

NSLog(@"s0与s2的字符串内容相同");

}

NSObject *obj1;

NSObject *obj2;

NSString *string8 = @"a";

NSString *string9 = @"A";

compare: 比较字符串的大小

NSComparisonResult result = [string8 compare:string9];

if (result == NSOrderedAscending) { 结果为升序

NSLog(@"string8 < string9");

} else if(result == NSOrderedSame) {

NSLog(@"string8 string9 内容同样");

} else if(result == NSOrderedDescending) {

NSLog(@"string8 > string9");

}

length: 获取字符串的长度

NSString *string10 = @"abcdef";

NSInteger len = [string10 length];

NSLog(@"len = %ld",len);

NSString *string11 = @"hELlo";

uppercaseString:将字符串中的字母转成大写

NSLog(@"upper:%@",[string11 uppercaseString]);

uppercaseString

NSLog(@"lower:%@",[string11 lowercaseString]);

capitalizedString:首字母大写,其余字母小写

NSLog(@"capitalized:%@",[string11 capitalizedString]);

将字符串转成基本数据类型

NSString *string12 = @"3.14";

float f = (float)string12; 错误

floatValue:字符串中是一个浮点数值转成float

float f = [string12 floatValue];

NSLog(@"floatValue:%f",f);

NSString *string13 = @"1";

BOOL bo = [string13 boolValue]; //true

---------------(4)字符串截取--------------------

NSString *string14 = @"abcdef";

---------------(4)字符串截取--------------------

NSString *substring1 = [string14 substringToIndex:3];

NSLog(@"substringToIndex:%@",substring1);

substringFromIndex:从指定索引位置开始截取到末尾，包含指定的索引f

NSString *substring2 = [string14 substringFromIndex:1];

NSLog(@"substringFromIndex:%@",substring2);

NSRange rang = {2,3}; 2:指定位置 3:须要截取的长度

substringWithRange:截取指定范围的字符串

NSString *substring3 = [string14 substringWithRange:rang];

NSLog(@"substringWithRange:%@",substring3);

NSArray *array = [string componentsSeparatedByString:@"A"]; 从字符A中分隔成2个元素的数组

---------------(5)拼接字符串--------------------

NSString *str1 = @"Hello";

NSString *str2 = @"World";

NSString *str3 = @"OC!";

NSString *string15 = [NSString stringWithFormat:@"%@-%@-%@",str1,str2,str3];

NSLog(@"string15:%@",string15);

字符串追加

NSString *string16 = [string15 stringByAppendingString:@"-iOS"];

NSString *string17 = [string15 stringByAppendingFormat:@"%@,%@",@"iOS",@"iPhone"];

NSLog(@"string16:%@",string16);

NSLog(@"string17:%@",string17);

字符串追加

NSString *link = @" www.iphonetrain.com/.html";

rangeOfString:查找字符串所在的位置

NSRange linkRang = [link rangeOfString:@"html"];

if (linkRang.location != NSNotFound) {

NSLog(@"location:%ld,length:%ld",linkRang.location,linkRang.length);

}

例如：能查找到@ 163.com，说明此邮箱是网易邮箱

NSString *email = @" 12345@163.com";

/*___________________________NSMutableString(不可变字符串)__________________________*/

NSMutableString *mutableString1 = @"string"; 错误

NSMutableString *mutableString1 = [[NSMutableString alloc] initWithFormat:@"字符串"];

insertString: 在原有的字符串基础上插入字符串

[mutableString1 insertString:@"可变" atIndex:0];

NSLog(@"mutableString1:%@",mutableString1);

NSMutableString *mutableString2 = [NSMutableString stringWithFormat:@"字符符符串"];

rangeOfString:查找指定字符串所在的范围

NSRange rang3 = [mutableString2 rangeOfString:@"符符"];

deleteCharactersInRange:根据范围删除指定的字符串

[mutableString2 deleteCharactersInRange:rang3];

NSLog(@"mutableString2:%@",mutableString2);

NSMutableString *mutableString3 = [NSMutableString stringWithFormat:@"字符串"];

NSRange rang4 = [mutableString3 rangeOfString:@"字符"];

replaceCharactersInRange:withString: 字符串替换

[mutableString3 replaceCharactersInRange:rang4

withString:@"羊肉"];

NSLog(@"mutableString3:%@",mutableString3);

NSArray：

/*_________________________不可变数组(NSArray)_______________________________*/

---------------------1.数组的建立--------------------------

NSString *s1 = @"zhangsan";

NSString *s2 = @"lisi";

NSString *s3 = @"wangwu";

NSArray *array1 = [[NSArray alloc] initWithObjects:s1,s2,s3, nil];

NSLog(@"%@",array1);

类方法建立，注意：最后以nil结尾。

NSArray *array2 = [NSArray arrayWithObjects:s1,s2,s3, nil];

初始一个元素对象

NSArray *array3 = [NSArray arrayWithObject:s1];

建立一个数组，此数组中的元素来自array1

NSArray *array4 = [NSArray arrayWithArray:array1];

---------------------2.经过下标取元素--------------------------

NSString *str1 = [array4 objectAtIndex:0];

NSLog(@"str1 = %@",str1);

---------------------3.数组的元素个数--------------------------

NSUInteger count = [array4 count];

NSUInteger count2 = array4.count; 点语法等价于-> [array4 count];注意count是不能带参数

NSLog(@"count2 = %ld",count2);

---------------------4.判断是否包含某个对象--------------------------

BOOL isContains = [array4 containsObject:@"zhangsan"];

NSLog(@"isContains: %d",isContains);

---------------------5.对象在数组中的索引位置--------------------------

NSUInteger index = [array4 indexOfObject:@"wangwu"];

NSLog(@"index = %ld",index);

---------------------6.连接数组中的字符串--------------------------

注意：数组中的元素必须都是字符串，才可使用此方法

NSString *joinString = [array4 componentsJoinedByString:@","];

NSLog(@"join:%@",joinString); //zhangsan,lisi,wangwu

---------------------7.访问最后一个元素--------------------------

NSString *last = [array4 lastObject]; //等价于点语法：array4.lastObject;

NSLog(@"last:%@",last);

---------------------8.在原来的数组上追加对象--------------------------

追加以后，建立了一个新的数组

NSArray *array5 = [array4 arrayByAddingObject:@"zhaoliu"];

NSLog(@"array5:%@",array5);

注意：1.数组中不能存放基本数据类型，只能存放对象

2.数组越界

NSArray *array6 = [NSArray arrayWithObject:100]; //错误，基本数据类型不能存放到数组中

int idx = 4;

if (idx < array5.count) { 严谨的写法，只有下标小于元素个数时，才可使用下标取元素

[array5 objectAtIndex:idx];

}

---------------xcode4.4之后对数组的建立和访问，语法上作了优化---------------

1.建立一个数组

NSArray *array7 = @[s1,s2,s3];

等价于NSArray *array2 = [NSArray arrayWithObjects:s1,s2,s3, nil];

NSLog(@"array7=%@",array7);

NSString *str = array7[0];

NSLog(@"array7[0] = %@",str);

/*_________________________可变数组(NSMutableArray)_______________________________*

NSString *t1 = @"zhangsan";

NSString *t2 = @"lisi";

NSString *t3 = @"wangwu";

---------------------1.建立可变数组--------------------------

NSMutableArray *marray1 = [[NSMutableArray alloc] initWithObjects:t1,t2,t3, nil];

建立数组时，开辟3个空间来存储元素，当存储的元素超过3个时，系统会自动增大此数组的空间

NSMutableArray *marray2 = [[NSMutableArray alloc] initWithCapacity:3];

NSMutableArray *marray3 = [NSMutableArray arrayWithCapacity:3];

新语法建立的是不可变数组

NSMutableArray *marray4 = @[s1,s2,s3]; //错误

---------------------2.添加元素--------------------------

[marray2 addObject:s1];

[marray2 addObject:s2];

[marray2 addObject:s3];

将marray2中全部的元素全都添加到marray3中

[marray3 addObjectsFromArray:marray2];

这是marray2添加到marray3中，marray3则是个二维数组

[marray3 addObject:marray2];

---------------------3.插入元素--------------------------

[marray2 insertObject:@"赵六" atIndex:0];