在xcode中使用AFNetworking進行下載文件時出現錯誤

Question

我創建了一個具有一個頁面的應用程序，並且在該頁面中存在一個按鈕，該按鈕在點擊時下載了文件。

我可以下載文件，AFNetworking但我有錯誤....

這是我的代碼：

- (IBAction)downloads:(id)sender 
{ 
    NSLog(@"start downloads"); 
    NSURLRequest *request = [NSURLRequest requestWithURL: 
    [NSURL URLWithString: 
    @"http://.../500x333xgalaxy-core-product-image-1tn.jpg, 
          q1367836642.pagespeed.ic.eafBYU8jUN.jpg"]]; 
    AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc] 
                  initWithRequest:request]; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                    NSUserDomainMask, YES); 
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent 
                     :@"filename.jpg"]; 

    operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO]; 

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, 
    id responseObject) { 
     NSLog(@"Successfully downloaded file to %@", path); 
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     NSLog(@"Error: %@", error); 
    }]; 

} 

此錯誤是：

No visible @interface 'AFURLConnectionOpretion' declares the selector 
                 'setCompletionBlockWithSuccess' 

Answer 1

使用下面的行開始操作：

[operation start]; 

Answer 2

這是我的下載代碼

AFHTTPRequestOperation *urlConnection; 
urlConnection = [[AFHTTPRequestOperation alloc] initWithRequest:request]; 
urlConnection.outputStream = [NSOutputStream outputStreamToFileAtPath:outputPath append:NO]; 
[urlConnection setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { 

    NSLog(@"Download Completed"); 


} failure:^(AFHTTPRequestOperation *operation, NSError *error) { 

    NSLog(@"Error occured while downloading"); 

}]; 

[urlConnection setDownloadProgressBlock:^(NSInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) { 

}]; 

變化 「AFURLConnectionOperation *操作」 到 「AFHTTPRequestOperation *操作」 我認爲是問題