IOS开发（89）之动画之视图的缩放

1 前言
今天我们学习一下如何为你的视图创建一个仿射缩放变换并使用 uiview 的动画方法来执行缩放变换。

2 代码实例
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]; 
    //设置图片的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; 
    //设置转换标识 
    self.xcodeimageview.transform = cgaffinetransformidentity; 
    /* begin the animation */ 
    [uiview beginanimations:nil context:null]; 
    /* make the animation 5 seconds long */ 
    [uiview setanimationduration:5.0f]; 
    //图形放大两倍 
    self.xcodeimageview.transform = cgaffinetransformmakescale(2.0f, 2.0f); 
    /* commit the animation */ 
    [uiview commitanimations]; 
}