JSON返回空崩潰應用

Question

我有一些代碼使用Dribbble API來返回一個Shot，但是，如果JSON中的任何數據是空的，應用崩潰，我試圖實現並捕獲，如果它是null繼續前進，但這似乎不起作用。請有人建議？

非常感謝

詹姆斯

self.JSONString = [NSString stringWithFormat:@"http://api.dribbble.com/shots/1970521"]; 
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:self.JSONString]]; 

__block NSDictionary *json; 
[NSURLConnection sendAsynchronousRequest:request 
            queue:[NSOperationQueue mainQueue] 
         completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 
          if (data != nil) { 
           json = [NSJSONSerialization JSONObjectWithData:data 
                     options:0 
                     error:nil]; 
           NSLog(@"Async JSON: %@", json); 
          } 
          else { 
           return; 
          } 
         }]; 

Answer 1

您需要妥善處理連接錯誤。 嘗試類似這樣：

self.JSONString = [NSString stringWithFormat:@"http://api.dribbble.com/shots/1970521"]; 
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:self.JSONString]]; 

__block NSDictionary *json; 
[NSURLConnection sendAsynchronousRequest:request 
    queue:[NSOperationQueue mainQueue] 
    completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) 
    { 
     if (connectionError != nil || data == nil) 
     { 
      NSLog(@"Error loading dribble shot: %@",connectionError); 
      //TODO: Show an alert to the user with UIAlertView? 
     } 
     else 
     { 
      NSError *jsonParsingError = nil; 
      json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonParsingError]; 
      if (jsonParsingError != nil || json == nil){ 
       NSLog(@"Error parsing JSON: %@",jsonParsingError); 
       //TODO: User alert? 
      } 
      else 
      { 
       NSLog(@"Parsed JSON: %@",json); 
       //Process parsed JSON, update UI, etc. 
       //Keep in mind updates to the UI should be done in a main-thread call like this: 
       dispatch_sync(dispatch_get_main_queue(),^{ 
        //Update UI here 
       }); 
      } 
     } 
    } 
}]; 

Answer 2

您可以使用第三方Dribbble iOS SDK。它包裝所有Dribbble API，提供單行api調用方法，還包含OAuth2集成流和數據模型類。檢出：https://github.com/agilie/dribbble-ios-sdk