ios开发基础知识 － 1

输出

command＋shift＋r

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

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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];

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app frame 大小

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

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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];

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在状态栏显示网络状态

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

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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];

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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];