Question

我有一些使用Dribbble API返回Shot的代码，但是，如果JSON中的任何数据为空，应用程序崩溃，我试图实现并捕获它，如果它为null继续，但这似乎不起作用。有人可以建议吗？

非常感谢

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

您需要适当地处理连接错误。尝试这样的事情：

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。它包含所有Dribbble API，提供单行api调用方法，还包括OAuth2集成流和数据模型类。查看：https://github.com/agilie/dribbble-ios-sdk

JSON返回Null Crashes App

2 个答案: