IOS開發（89）之動畫之視圖的縮放

1 前言
今天我們學習一下如何為你的視圖建立一個仿射縮放變換並使用 UIView 的動畫方法來執行縮放變換。

2 代碼執行個體
ZYViewController.m：

[plain]  - (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    UIImage *xcodeImage = [UIImage imageNamed:@"Xcode.png"]; 
    self.xcodeImageView = [[UIImageView alloc] initWithImage:xcodeImage]; 
    //設定圖片的Frame 
    [self.xcodeImageView setFrame:CGRectMake(0.0f,0.0f, 100.0f, 100.0f)]; 
    self.view.backgroundColor = [UIColor whiteColor]; 
    [self.view addSubview:self.xcodeImageView]; 
} 
 
- (void) viewDidAppear:(BOOL)paramAnimated{ [super viewDidAppear:paramAnimated]; 
    /* Place the image view at the center of the view of this view controller */ 
    self.xcodeImageView.center = self.view.center; 
    //設定轉換標識 
    self.xcodeImageView.transform = CGAffineTransformIdentity; 
    /* Begin the animation */ 
    [UIView beginAnimations:nil context:NULL]; 
    /* Make the animation 5 seconds long */ 
    [UIView setAnimationDuration:5.0f]; 
    //圖形放大兩倍 
    self.xcodeImageView.transform = CGAffineTransformMakeScale(2.0f, 2.0f); 
    /* Commit the animation */ 
    [UIView commitAnimations]; 
}