<p style="text-align:center"><img src="https://simg.open-open.com/show/50e7884d8f867bf17b6ae8e3049d4937.png"></p>    <h2>前言</h2>    <p>许多项目需要加载GIF图片，但是在直接使用UIImageView加载存在许多问题，于是查找资料做了一个加载GIF的Demo，思路来源 <a href="/misc/goto?guid=4959660098008486997" rel="nofollow,noindex">https://github.com/YouXianMing/Animations</a> 在链接里边，已经给出了解决办法，Demo只是将功能剥离，简单封装了一下。</p>    <h2>思路</h2>    <p>使用FLAnimatedImage来加载GIF图片，再利用SDWebImage来做缓存，话不多说，直接上代码。</p>    <h2>使用方法</h2>    <pre>  <code class="language-objectivec">导入头文件#import "GIFView.h"      创建GIFView，添加到视图上  GIFView *view = [[GIFView alloc] initWithFrame:CGRectMake(0, 200, self.view.frame.size.width, 300)];  view.url = @"http://upload-images.jianshu.io/upload_images/1979970-9d2b1cc945099612.gif?imageMogr2/auto-orient/strip";  [self.view addSubview:view];</code></pre>    <h2>GIFView内部代码</h2>    <pre>  <code class="language-objectivec">@interface GIFView()  /**GIF视图*/  @property (nonatomic,weak)FLAnimatedImageView *gifImageView;    @end    @implementation GIFView    -(instancetype)initWithFrame:(CGRect)frame  {      if (self = [super initWithFrame:frame])      {          [self initUI];      }      return self;  }    - (void)initUI  {      //创建FLAnimatedImageView,继承自UIView      FLAnimatedImageView *gifImageView = [[FLAnimatedImageView alloc] init];      gifImageView.frame                = self.frame;      [self addSubview:gifImageView];      _gifImageView = gifImageView;  }    -(void)setUrl:(NSString *)url  {      _url = url;      //将GIF转换成Data      NSData   *gifImageData             = [self imageDataFromDiskCacheWithKey:url];      //沙盒存在，直接加载显示      if (gifImageData)      {          [self animatedImageView:_gifImageView data:gifImageData];          //沙盒不存在，网络获取      } else      {          __weak __typeof(self) weakSelf = self;          NSURL *newUrl = [NSURL URLWithString:url];          [[SDWebImageDownloader sharedDownloader] downloadImageWithURL:newUrl                                                                options:0                                                               progress:nil                                                              completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {                                                                    [[[SDWebImageManager sharedManager] imageCache] storeImage:image                                                                                                        recalculateFromImage:NO                                                                                                                   imageData:data                                                                                                                      forKey:newUrl.absoluteString                                                                                                                      toDisk:YES];                                                                  //主线程显示                                                                  dispatch_async(dispatch_get_main_queue(), ^{                                                                      [weakSelf animatedImageView:_gifImageView data:data];                                                                  });                                                              }];      }  }  //通过数据创建GIF  - (void)animatedImageView:(FLAnimatedImageView *)imageView data:(NSData *)data  {      FLAnimatedImage *gifImage = [FLAnimatedImage animatedImageWithGIFData:data];      imageView.frame           = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);      imageView.animatedImage   = gifImage;      imageView.alpha           = 0.f;        [UIView animateWithDuration:1.f animations:^{          imageView.alpha = 1.f;      }];  }    //从沙盒读取  - (NSData *)imageDataFromDiskCacheWithKey:(NSString *)key  {      NSString *path = [[[SDWebImageManager sharedManager] imageCache] defaultCachePathForKey:key];      return [NSData dataWithContentsOfFile:path];  }</code></pre>    <h2>效果图</h2>    <p>这里需要注意要用真机测试，模拟器测试会看到卡顿现象</p>    <p style="text-align:center"><img src="https://simg.open-open.com/show/e11ea947c6832e5c15e6fd66d7bcf828.gif"></p>    <p style="text-align:center">真机效果图.gif</p>    <h2>声明</h2>    <p>在这里说明下，只是简单的剥离功能，封装了一下，方便大家使用。</p>    <p> </p>    <p>来自：http://www.jianshu.com/p/ed49ff11334d</p>    <p> </p>