ios播放动画
iPhone SDK提供了多种动画手段，UIView、UIImageView和CALayer都支持动画。但如何处理常见的gif动画呢？UIWebView提供了答案，代码如下：
1. 使用UIWebView播放
// 设定位置和大小
CGRect frame = CGRectMake(50,50,0,0);
frame.size = [UIImage imageNamed:@"guzhang.gif"].size;
// 读取gif图片数据
NSData *gif = [NSData dataWithContentsOfFile: [[NSBundle mainBundle] pathForResource:@"guzhang" ofType:@"gif"]];
// view生成
UIWebView *webView = [[UIWebView alloc] initWithFrame:frame];
webView.userInteractionEnabled = NO;//用户不可交互
[webView loadData:gif MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
[self.view addSubview:webView];
[webView release];
2.将gif图片分解成多张png图片，使用UIImageView播放。
代码如下：
UIImageView *gifImageView = [[UIImageView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
NSArray *gifArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"1"],
[UIImage imageNamed:@"2"],
[UIImage imageNamed:@"3"],
[UIImage imageNamed:@"4"],
[UIImage imageNamed:@"5"],
[UIImage imageNamed:@"6"],
[UIImage imageNamed:@"7"],
[UIImage imageNamed:@"8"],
[UIImage imageNamed:@"9"],
[UIImage imageNamed:@"10"],
[UIImage imageNamed:@"11"],
[UIImage imageNamed:@"12"],
[UIImage imageNamed:@"13"],
[UIImage imageNamed:@"14"],
[UIImage imageNamed:@"15"],
[UIImage imageNamed:@"16"],
[UIImage imageNamed:@"17"],
[UIImage imageNamed:@"18"],
[UIImage imageNamed:@"19"],
[UIImage imageNamed:@"20"],
[UIImage imageNamed:@"21"],
[UIImage imageNamed:@"22"],nil];
gifImageView.animationImages = gifArray; //动画图片数组
gifImageView.animationDuration = 5; //执行一次完整动画所需的时长
gifImageView.animationRepeatCount = 1; //动画重复次数
[gifImageView startAnimating];
[self.view addSubview:gifImageView];
[gifImageView release];