Xcode6.1 UIImageView无法正常显示

Question

我甚至不确定如何谷歌这个问题。我的应用程序上的图像没有完全显示。我希望在320 x 170像素约束（或大部分）中拟合整个图像。现在我所能获得的是一个截止版本，无论我对图像的限制做什么，我似乎无法让这个工作。

我已经尝试了谷歌提供的每种模式和调整变化，我可以想到。

1. 屏幕截图：http://imgur.com/a/W472O#0

   @interface InzombImageCell（）

   @property AFHTTPRequestOperation* mediumImageOperation;
   
   @end
   
   @implementation InzombImageCell
   
   - (void)prepareForReuse {
     [super prepareForReuse];
     [self.mediumImageOperation cancel];
     self.mediumImageOperation = nil;
     self.mediumImageView.image = nil;
   }
   
   - (void)initializeCell {
     // define the medium size image URL
     NSURLRequest* mediumImageRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:self.image.mediumUrl]];
   
     // set the image response serializer for fetching the image
     AFImageResponseSerializer* mediumImageResponseSerializer = [AFImageResponseSerializer serializer];
     // automatically inflates the response image for better rendering time
     [mediumImageResponseSerializer setAutomaticallyInflatesResponseImage:YES];
     // set the image scale for retina displays
     [mediumImageResponseSerializer setImageScale:0.25];
   
     // set the self object because we don't want a retain cycle
     InzombImageCell* imageCell = self;
   
     [self.progressScroller startAnimating];
     // define the medium size image request
     self.mediumImageOperation = [[AFHTTPRequestOperation alloc] initWithRequest:mediumImageRequest];
     [self.mediumImageOperation setResponseSerializer:mediumImageResponseSerializer];
     [self.mediumImageOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, UIImage* responseObject) {
       [imageCell.mediumImageView setImage:responseObject];
       [imageCell.progressScroller stopAnimating];
     } failure:nil];
     [self.mediumImageOperation start];
   }