ios开发基础知识 － 一

ios开发基础知识 － 1

输出

command＋shift＋r

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

显示图片

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

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

浏览器控件

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

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

播放序列动画

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

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