UIImageView多张图片切换

- (void)viewDidLoad  
{  
    //定义数组，存放所有图片对象   
    NSArray *images=[NSArray arrayWithObjects:[UIImage imageNamed:@"xuanyi.jpg"],[UIImage imageNamed:@"xigua.jpg"],[UIImage imageNamed:@"juhua.jpg"],[UIImage imageNamed:@"heihua.jpg"],[UIImage imageNamed:@"cell.jpg"], nil];  
    //定义结构体，方块大小  
    CGRect frame=CGRectMake(0, 0, 320, 460);  
    //初始化图像视图对象，大小是frame  
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:frame];  
    //imageView的动画图片是数组images  
    imageView.animationImages = images;  
    //按照原始比例缩放图片，保持纵横比  
    imageView.contentMode = UIViewContentModeScaleAspectFit;   
    //切换动作的时间3秒，来控制图像显示的速度有多快，  
    imageView.animationDuration = 3;   
    //动画的重复次数，想让它无限循环就赋成0  
    imageView.animationRepeatCount = 0;   
    //开始动画  
    [imageView startAnimating];  
    //添加控件  
    [self.view addSubview:imageView];  
  
    //释放内存  
    [imageView release];  
      
    [super viewDidLoad];  
    // Do any additional setup after loading the view, typically from a nib.  
}