UI_06 UIControl及其子类

⼀、UISegmentedControl的使⽤

     分段控件。每一个segment都能被点击，至关于集成了若干个button。 一般咱们会点击不一样的segment来切换不一样的view。

一、常⽤⽅法和属性

• initWithItems:                                    //UISegmentedControl独有的初始化⽅法，⽤来建立多个分段

• setTitle: forSegmentAtIndex:            //为指定下标的分段设置title

• selectedSegmentAtIndex                 //（property）被选中的segment

• tintColor                                            //（property）segmentedControl条的颜⾊（含每一个segment的颜⾊）

• addTarget: action: forControlEvents://给UISegmentedControl添加事件，

• controlEvent                                      //为UIControlEventValueChanged。

二、使用

RootViewController.m

#import "RootViewController.h"
#import "MessageViewController.h"
#import "PhoneViewController.h"

@interface RootViewController ()

@property (nonatomic, retain) UISegmentedControl *segmentedControl;

@property (nonatomic, retain) MessageViewController * messageVC;

@property (nonatomic, retain) PhoneViewController * phoneVC;

@end

@implementation RootViewController
- (void)dealloc
{
    [_segmentedControl release];
    [_messageVC release];
    [_phoneVC release];
    [super dealloc];
}
- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
   
#pragma mark -- 添加子视图控制器 --
    [self createChildViewControllers];
   
#pragma mark -- UISegmentedControl --
    [self createSegmentedControl];

}

- (void)createChildViewControllers
{
    MessageViewController * messageVC = [[MessageViewController alloc] init];
    PhoneViewController * phoneVC = [[PhoneViewController alloc] init];
   
    self.phoneVC = phoneVC;
    self.messageVC = messageVC;
   
    [self addChildViewController:messageVC];
    [self addChildViewController:phoneVC];
   
    [messageVC release];
    [phoneVC release];
   
    [self.view addSubview:messageVC.view];
   
}

- (void)createSegmentedControl
{
    UIImage *image

    = [UIImage imageNamed:@"bank_icon_ccb.png"];

    

    self.segmentedControl = [[UISegmentedControl alloc] initWithItems:@[@"消息",@"电话",image]];
    self.segmentedControl.frame = CGRectMake(100, 100, 150, 30);
    self.segmentedControl.selectedSegmentIndex = 0;
    //改变颜色
    _segmentedControl.tintColor = [UIColor redColor];
    [self.view addSubview:self.segmentedControl];
    [self.segmentedControl release];
    //添加事件

    [_segmentedControl addTarget:self action:@selector(exchangeView:) forControlEvents:UIControlEventValueChanged];

    

    [self.segmentedControl release];
}

- (void)exchangeView:(UISegmentedControl *)SC
{
    NSLog(@"%ld", (long)SC.selectedSegmentIndex);
    switch (SC.selectedSegmentIndex) {
        case 0: {
            if (!self.messageVC.view.superview) {
                [_phoneVC.view removeFromSuperview];
                [self.view addSubview:_messageVC.view];
            }
            break;
        }
        case 1:
            if (!_phoneVC.view.superview) {
                [_messageVC.view removeFromSuperview];
                [self.view addSubview:_phoneVC.view];
            }
            break;
        default:
            break;
    }
    [self.view bringSubviewToFront:SC];
}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

@end

---

⼆、UISlider的使⽤

     滑块控件。 一般⽤于控制视频播放进度，控制⾳量等。 它也是继承于UIControl，滑块提供了⼀系列连续的值，滑块停在不 同的位置，获取到滑块上的值也不一样。

一、UISlider常⽤属性

• minimumValue                                   //设置滑块的最⼩值

• maximumValue                                  //设置滑块的最⼤值

• value                                                  //设置滑块的当前值

• minimumTrackTinkColor                    //定义划过区域的颜⾊

• addTarget: action: forControlEvents: //给UISlider添加事件，

• controlEvent                                       //为UIControlEventValueChanged。

二、UISlider使用

     下面是UISlider与UIImageView的综合使用。用UISlider控制动图的播放速度（关于UIImageView的介绍请看前一篇）

RootViewController.m

#import "RootViewController.h"

@interface RootViewController ()
@property (nonatomic, retain) UIImageView *imgView;
@property (nonatomic, retain) UISlider *slider;

@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
   
#pragma mark -- 建立UIImageView --
    [self createImageView];
#pragma mark -- 建立UISlider --
    [self createSlider];
}

- (void)createSlider
{
    self.slider = [[UISlider alloc] initWithFrame:CGRectMake(50, 400, 267, 30)];
    [self.view addSubview:_slider];
   
    [_slider release];
   
    _slider.minimumValue = 1;
    _slider.maximumValue = 5; //最大值必须大于最小值
    _slider.minimumTrackTintColor = [UIColor redColor];
    _slider.maximumTrackTintColor = [UIColor blueColor];
    //设置滑块
    [_slider setThumbImage:[UIImage imageNamed:@"greenbird.png"] forState:UIControlStateNormal];
    [_slider setThumbImage:[UIImage imageNamed:@"bluebird.png"] forState:UIControlStateHighlighted];
    [_slider addTarget:self action:@selector(changeSpeed:) forControlEvents:UIControlEventValueChanged];
   
}

- (void)changeSpeed:(UISlider *)slider
{
    if (slider.value==slider.minimumValue) {
        [self.imgView stopAnimating];
    } else if(slider.value != slider.maximumValue) {
        self.imgView.animationDuration = slider.maximumValue-slider.value;
        [self.imgView startAnimating];
    } else {
        self.imgView.animationDuration = 0.0001;
        [self.imgView startAnimating];
    }
}

- (void)createImageView
{
    self.imgView = [[UIImageView alloc] init];
    _imgView.frame = CGRectMake(50, 100, 250, 250);
    [self.view addSubview:_imgView];
    [_imgView release];
   
    NSMutableArray * imagesArray = [NSMutableArray array];
    for (int i = 1; i<28; i++) {
        [imagesArray addObject:[UIImage imageNamed:[NSString stringWithFormat:@"Z6CLNZ]T)N8I}L9A))7TRD9－%d（被拖移）.tiff", i]]];
    }
    _imgView.animationImages = imagesArray;
    _imgView.image = _imgView.animationImages[0];
}


- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

}

@end

---

3、UIAlertController

RootViewController.m

#import "RootViewController.h"

@interface RootViewController ()
@property (nonatomic, retain) UITextField * textField;
@property (nonatomic, retain) UIButton *button;
@end

@implementation RootViewController

- (void)dealloc
{
    [_textField release];
    [_button release];
    [super dealloc];
}

- (void)viewDidLoad {
    [super viewDidLoad];
   
    self.textField = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 150, 30)];
   
    _textField.borderStyle = UITextBorderStyleRoundedRect;
    _textField.placeholder = @"请输入密码";
    [self.view addSubview:_textField];
    [_textField release];
   
    self.button = [UIButton buttonWithType:UIButtonTypeCustom];
    _button.frame = CGRectMake(150, 300, 60, 30);
    [_button setTitle:@"登录" forState:UIControlStateNormal];
    [_button setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [_button addTarget:self action:@selector(login:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_button];
   
   
    NSLog(@"%lu", self.retainCount);
}

- (void)login:(UIButton *)button
{
    NSString * infoStr;
    if ([_textField.text isEqualToString:@"123"]) {

        infoStr = @"登陆成功";

#pragma mark -- UIAlertView --     //UIAlertView

        UIAlertView * alertView = [[UIAlertView alloc] initWithTitle:@"登陆成功" message:infoStr delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"肯定", nil];
        [alertView show];

        [alertView release];

    } else {

        infoStr = @"登陆失败";

#pragma mark -- UIAlertController --      //UIAlertController

        UIAlertController * alertC = [UIAlertController alertControllerWithTitle:@"登陆信息" message:infoStr preferredStyle:UIAlertControllerStyleAlert];

        //避免循环引用

        //在block里用到self，将self赋值给__block修饰的变量再使用

        __block RootViewController *rootVC = self;
        //在block里用到实例变量（非属性），用以下方式
        //    __block UITextField *textField = _textField;
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
            [rootVC.textField resignFirstResponder];
        }];
       

        UIAlertAction *reloginAction = [UIAlertAction actionWithTitle:@"从新登陆" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

            rootVC.textField.text = @"";
        }];

       

        [alertC addAction:cancelAction];
        [alertC addAction:reloginAction];
       
        [self presentViewController:alertC animated:YES completion:nil];
    }

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSLog(@"%@", _textField.text);
}

- (void)alertViewCancel:(UIAlertView *)alertView
{
    NSLog(@"canceled");
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];

}

@end

---

4、UIControl的做⽤

     UIControl是全部控制控件（⽐如UIButton、UISlider、 UISegmentedControl等）的基类。 只要跟控制有关的控件都是继承于该类。

一、UIControl的核⼼功能

• 为控制控件经过addTarget: action: forControlEvents: ⽅法来添加事件。

• 经过removeTarget: action: forControlEvents: 来移除事件。

二、UIControl的继承关系

• NSObject

• UIResponder

• UIView

• UIControl

• UIButton

• UIDatePicker

• UIPageControl

• UIRefreshControl

• UISegmentedControl

• UISlider

• UIStepper

• UISwitch

• UITextField

iOS UIKit_Framework:

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIKit_Framework/index.html#other