gif图片加载普通方法(可以控制gif的进度控制内部都有接口)

gitYYImage实例

//加载image
YYImage *image = [YYImage imageNamed:@"niconiconi@2x.gif"];

//创建ImageView
YYAnimatedImageView *imageView = [[YYAnimatedImageView alloc] initWithImage:image];

//YYAdd中的拓展UIView方法
imageView.size = CGSizeMake(image.size.width * 0.6, image.size.height * 0.6);
imageView.top = 80;
imageView.centerX = self.view.width / 2;
[self.view addSubview:imageView];

帧动画图片组加载

    NSMutableArray *paths = [NSMutableArray new];
    
  //把一帧一帧的图片加入到数组中
    [paths addObject:[basePath stringByAppendingPathComponent:@"d_aini1.png"]];
    [paths addObject:[basePath stringByAppendingPathComponent:@"d_aini2.png"]];
    [paths addObject:[basePath stringByAppendingPathComponent:@"d_aini3.png"]];
   
  //设置动画时间和循环次数
    UIImage *image = [[YYFrameImage alloc] initWithImagePaths:paths oneFrameDuration:0.1 loopCount:0];

  YYAnimatedImageView *imageView = [[YYAnimatedImageView alloc] initWithImage:image];
  [self.view addSubview:imageView];

​

根据进度显示图片(已知图片的部分数据显示部分图片)

• 第一种:一部分一部分逐行扫描方式
• 第二种:模糊到清晰显示

    NSData *subData = //获得图片部分数据
    YYImageDecoder *decoder = [[YYImageDecoder alloc] initWithScale:[UIScreen mainScreen].scale];
    [decoder updateData:subData final:NO];
    YYImageFrame *frame = [decoder frameAtIndex:0 decodeForDisplay:YES];
    _imageView.image = frame.image; //使用UIImageView和YY都是可以的

图片缓存(之前是sdWebImage)

• 简单方法

      UIImageView *imageView = [UIImageView new];
      
      imageView.size = CGSizeMake(300, 200);
      imageView.top = 100;
      
      NSURL *url = [[NSURL alloc] initWithString:@"https://s-media-cache-ak0.pinimg.com/1200x/2e/0c/c5/2e0cc5d86e7b7cd42af225c29f21c37f.jpg"];
      [imageView setImageWithURL:url placeholder:nil];
      [self.view addSubview:imageView];
  

• 详细控制

  //可以控制图片是否缓存，显示方式(模糊变清晰, 或者逐行扫描)
  [_webImageView setImageWithURL:url
                         placeholder:nil
                             options:YYWebImageOptionProgressiveBlur | YYWebImageOptionShowNetworkActivity | YYWebImageOptionSetImageWithFadeAnimation
                            progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                                if (expectedSize > 0 && receivedSize > 0) {
                                    CGFloat progress = (CGFloat)receivedSize / expectedSize;
                                    progress = progress < 0 ? 0 : progress > 1 ? 1 : progress;
                                    if (_self.progressLayer.hidden) _self.progressLayer.hidden = NO;
                                    
                                    //绘制到哪里
                                    _self.progressLayer.strokeEnd = progress;
                                }
                            } transform:nil
                          completion:^(UIImage *image, NSURL *url, YYWebImageFromType from, YYWebImageStage stage, NSError *error) {
                              if (stage == YYWebImageStageFinished) {
                                  
                                  //结束后隐藏图片
                                  _self.progressLayer.hidden = YES;
                                  //动画停止并且隐藏
                                  [_self.indicator stopAnimating];
                                  _self.indicator.hidden = YES;
                                  //有图片了就隐藏label
                                  if (!image) _self.label.hidden = NO;
                              }
                          }];