MKNetworkKit下载图片并显示在UIImageView上

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- (IBAction)onClick:(id)sender {     NSMutableDictionary *imageDic = [[NSMutableDictionary alloc] init];     //获取本地沙箱的缓存路径     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);     NSString *cachesDirectory = paths[0];     NSString *downloadPath = [cachesDirectory stringByAppendingPathComponent:@"test1.jpg"];           //先从本地获取缓存图片     UIImage *image = [UIImage imageWithContentsOfFile:downloadPath];           //如果从本地缓存中获取为空，那么再从应用资源中获取一次     if (image == nil) {         image = [UIImage imageNamed:@"test1.jpg"];     }           if (nil != image) {         [imageDic setObject:image forKey:@"image"];         NSLog(@"缓存有图片！");         _imageView1.image = image;     }           //如果本地缓存图片为空，则远程请求，并缓存到本地     if(image == nil) {                   NSString *path = [[NSString alloc] initWithFormat:@"/service/download.php?email=%@&FileName=test1.jpg",@"gs.654586026@qq.com"];         path = [path stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];               MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"51work6.com" customHeaderFields:nil];               MKNetworkOperation *downloadOperation = [engine operationWithPath:path params:nil httpMethod:@"POST"];         [downloadOperation addDownloadStream:[NSOutputStream outputStreamToFileAtPath:downloadPath append:TRUE]];               [downloadOperation onDownloadProgressChanged:^(double progress) {         NSLog(@"download progress: %.2f%%", progress*100.0);         _progressView.progress = progress;         }];               [downloadOperation addCompletionHandler:^(MKNetworkOperation *operation) {                   NSLog(@"download file finished!");         UIImage *image = [UIImage imageWithContentsOfFile:downloadPath];         _imageView1.image = image;                       } errorHandler:^(MKNetworkOperation *errorOp, NSError* err) {             NSLog(@"MKNetwork请求错误 : %@", [err localizedDescription]);         }];     [engine enqueueOperation:downloadOperation];     } }