《大道至简 软件工程实践者的思想》 - 书摘精要

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];