播放GIF图有好几种方法
1.可以直接用ImageView一帧一帧的播放
2.可以用WebView加载一个页面播放
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但是它们的缺点比较明显，会失帧，如果图比较大多话，还有可能在屏幕比较小的设备上不能完全显示出来，
SDWebImage提供了很好的方法，只要导入播放GIF的头文件，只需短短的几行代码就可以实现。示例代码如下：
#import "ViewController.h"
#import "UIImage+GIF.h"
@interface ViewController ()
@property (nonatomic,strong) UIImageView *loadingImageView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self initLoadingImageView];
}
- (void)initLoadingImageView
{
NSString *name = @"4升级.gif";
NSString *filePath = [[NSBundle bundleWithPath:[[NSBundle mainBundle] bundlePath]] pathForResource:name ofType:nil];
NSData *imageData = [NSData dataWithContentsOfFile:filePath];
if (!self.loadingImageView) {
self.loadingImageView = [[UIImageView alloc]init];
}
self.loadingImageView.backgroundColor = [UIColor clearColor];
self.loadingImageView.image = [UIImage sd_animatedGIFWithData:imageData];
self.loadingImageView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
[self.view addSubview:self.loadingImageView];
[self.view bringSubviewToFront:self.loadingImageView];
}
@end