SDWebImage download image

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                    /**                     *  SDWebImage download images                     */                    SDWebImageDownloader *downloader = [SDWebImageDownloader sharedDownloader];                    [downloader downloadImageWithURL:[NSURL URLWithString:[dic objectForKey:@"pic_url"]]                                             options:0                                            progress:^(NSInteger receivedSize, NSInteger expectedSize) {                                                // progression tracking code                                            }                                           completed:^(UIImage *image, NSData *data, NSError *error, BOOL finished) {                                               if (image && finished) {                                                                                                      /**                                                    *  将路径作为key                                                    */                                                   NSString *cacheImageKey = [[SDWebImageManager sharedManager] cacheKeyForURL:[NSURL URLWithString:[dic objectForKey:@"pic_url"]]];                                                                                                      /**                                                    *  通过路径的key获取沙盒图片的路径                                                    */                                                   NSString *cacheImagePath = [[SDImageCache sharedImageCache] defaultCachePathForKey:cacheImageKey];                                                                                                      /**                                                    *  拿到缓存到本地的图片                                                    */                                                   UIImage *normalImage = [[UIImage alloc]initWithContentsOfFile:cacheImagePath];                                                                                                      /**                                                    *  将UIImage转成@2x的尺寸大小                                                    */                                                   normalImage = [UIImage imageWithCGImage:normalImage.CGImage scale:2 orientation:normalImage.imageOrientation];                                                                                                                                                         homeItem.image = [normalImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];                                                   homeItem.selectedImage = [normalImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];                                                   homeVC.tabBarItem = homeItem;                                                                                                      NSLog(@"cacheImagePath:%@",cacheImagePath);                                                                                                      // do something with image                                               }                                           }];                                        /**                     *  图片下载方法                     */                    [imageNormal sd_setImageWithURL:[NSURL URLWithString:[dic objectForKey:@"pic_url"]] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {                        if (image) {                                                        imageNormal.frame = CGRectMake(0, 0, image.size.width/2, image.size.height/2);                            homeItem.image = [imageNormal.image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];                            homeVC.tabBarItem = homeItem;                        }                    }];
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