IOS开发的基础知识

输出

command＋shift＋r

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NSLog     (@     "log: %@ "     , myString);  NSLog     (@     "log: %f "     , myFloat);  NSLog     (@     "log: %i "     , myInt);

显示图片

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CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 100.0f); UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect]; [myImage setImage:[UIImage imageNamed:@     "myImage.png"     ]]; [     self     .view addSubview:myImage]; [myImage release];

app frame 大小

1 2	CGRect bounds = [[UIScreen mainScreen] bounds]; CGRect frame = [UIScreen mainScreen].applicationFrame;

浏览器控件

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CGRect webFrame = CGRectMake(0.0, 0.0, 320.0, 480.0); UIWebView *webView = [[UIWebView alloc] initWithFrame:webFrame]; [webView setBackgroundColor:[UIColor clearColor]]; NSString       *urlAddress = @     "http://nasa.cnblogs.com"     ; NSURL       *url = [     NSURL       URLWithString:urlAddress]; NSURLRequest       *requestObj = [     NSURLRequest       requestWithURL:url]; [webView loadRequest:requestObj]; [     self       addSubview:webView]; [webView release];

在状态栏显示网络状态

1 2	UIApplication* app = [UIApplication sharedApplication]; app.networkActivityIndicatorVisible =     YES     ;

播放序列动画

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NSArray       *myImages = [     NSArray       arrayWithObjects:                           [UIImage imageNamed:@     "myImage1.png"     ],                           [UIImage imageNamed:@     "myImage2.png"     ],                           [UIImage imageNamed:@     "myImage3.png"     ],                           [UIImage imageNamed:@     "myImage4.gif"     ],                           nil     ];   UIImageView *myAnimatedView = [UIImageView alloc]; [myAnimatedView initWithFrame:[     self       bounds]]; myAnimatedView.animationImages = myImages; myAnimatedView.animationDuration = 0.25;     // 秒 myAnimatedView.animationRepeatCount = 0;     // 0 = 无限 [myAnimatedView startAnimating]; [     self       addSubview:myAnimatedView]; [myAnimatedView release];

提示筐

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UIAlertView *alert = [[UIAlertView alloc] initWithTitle:     nil       message:@     "Alert!"                                        delegate:     self       cancelButtonTitle:@     "OK"                                            otherButtonTitles:     nil     ]; [alert show]; [alert release];