AFNetworking setImageWithURLRequest下載進度

Question

我正在使用此代碼將圖像設置爲UIImageView。

NSURLRequest *URLRequest = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:imageToLoad]]; 

    [imageView setImageWithURLRequest:URLRequest placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) { 
     [cell.image setImage:image]; 
     [cell.activityIndicator stopAnimating]; 

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) { 
     // Nothing 
    }]; 

但我想跟蹤與方法下載進度，是possbile做到在setImageWithURLRequest方法？

通常我這樣做是爲了顯示加載進度百分比：

[SVProgressHUD showWithStatus:@"Start download..."]; 
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:link]]; 
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request]; 

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { 
     // success 
     [SVProgressHUD showSuccessWithStatus:@"Done."]; 

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     // failed 
     [SVProgressHUD showErrorWithStatus:@"Failed."]; 
    }]; 

    [operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) { 
     [SVProgressHUD showWithStatus:[NSString stringWithFormat:@"Downloading... %0.0f%%", totalBytesRead*100*1.0/(totalBytesRead+totalBytesExpectedToRead)]]; 
    }]; 

Answer 1

開箱即用，沒有的UIImageView + AFNetworking類別不具有此功能。但是，它可以很容易地通過增加這種方法的類別添加到：

-(void)setDownloadProgressBlock:(void (^)(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead))block{ 
    [self.af_imageRequestOperation setDownloadProgressBlock:block]; 
} 

Answer 2

看看這個可可豆莢：https://github.com/xmartlabs/XLRemoteImageView。它使用objective-c內部函數來實現你想要的。我希望它能幫助你。