YYImage使用

常用方法

• 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)

  

  //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;
                                }
                            }];