ios - UIKeyboardTaskQueue 线程问题

Question

我是 iOS 开发的新手，我已经被这个错误困扰了一段时间。我正在制作一个使用网络服务的简单应用程序。现在我有两个 View Controller 。登录 View Controller (及其 NIB 文件)和主视图 Controller (及其 NIB 文件)。当我创建应用程序时，我选择了一个空应用程序，所以我没有 Storyboard。相反，我正在使用 UINavigationController。当我运行代码时，输​​入用户名和密码并在登录 View 中按提交后出现以下错误:

由于未捕获的异常“NSInternalInconsistencyException”而终止应用程序，原因:“-[UIKeyboardTaskQueue waitUntilAllTask​​sAreFinished] 只能从主线程调用。”

这是我的提交按钮代码:

-(IBAction)logIn:(id)sender{
    UIApplication *application = [UIApplication sharedApplication];
    application.networkActivityIndicatorVisible = YES;

    [_loginNetworkingContorller checkCredentialsWithUsername:self.username.text withPassword:self.password.text completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if(!error){
            NSHTTPURLResponse *httpResp = (NSHTTPURLResponse*) response;
            if (httpResp.statusCode == 200) {
                NSLog(@"SUCESS");
                NSDictionary *credentials = @{self.username.text: self.password.text};
                [KeychainUserPass save:@"MY APP" data:credentials];
                UIViewController *mainView = [[RDMainViewController alloc] initWithNibName:@"RDMainViewController" bundle:nil];

                [self.navigationController pushViewController:mainView animated:YES];
            }
            else{
                NSLog(@"ERROR");
            }
        }
        else{
            NSLog(@"ERROR");
        }
    }];
}

下面是函数的代码

[_loginNetworkingContorller checkCredentialsWithUsername:self.username.text withPassword:self.password.text completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)

-(void)checkCredentialsWithUsername:(NSString *)username withPassword:(NSString *)password completionHandler:(void (^)(NSData *data,NSURLResponse *response, NSError *error))myCompletion
{
    NSString *requestString = @"SOME WEBSITE";
    NSURL *url = [NSURL URLWithString:requestString];
    NSURLRequest *req = [NSURLRequest requestWithURL:url];

    NSData *userPasswordData = [[NSString stringWithFormat:@"%@:%@", username, password] dataUsingEncoding:NSUTF8StringEncoding];
    NSString *base64EncodedCredential = [userPasswordData base64EncodedStringWithOptions:0];
    NSString *authString = [NSString stringWithFormat:@"Basic %@", base64EncodedCredential];

    NSURLSessionConfiguration *sessionConfig=[NSURLSessionConfiguration defaultSessionConfiguration];
    sessionConfig.HTTPAdditionalHeaders=@{@"Authorization":authString};

    self.session=[NSURLSession sessionWithConfiguration:sessionConfig];

    NSURLSessionDataTask *dataTask = [self.session dataTaskWithRequest:req completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        myCompletion(data, response, error);
    }];

    [dataTask resume];
}

我现在卡住了，我不太确定问题出在哪里，尤其是因为我没有对键盘进行任何操作。我感觉我的积木有问题，但我不确定是什么问题。任何帮助将不胜感激。

Answer 1

嘿，在我收到网络电话的回复后，我遇到了同样的问题。我能够通过执行以下操作解决它:

 //do something with response

  dispatch_async(dispatch_get_main_queue()) { () -> Void in

     // continue with program by calling next step on main thread           
  }

我认为如果你推送到下一个 View Controller iOS 尝试在非主线程上执行它，会导致错误，但我不是 100% 是准确的