IOS开发的基础知识

原创
2014/01/20 10:20
阅读数 173

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

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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

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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];



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