ios - 警告-其 View 不在IOS 9的窗口层次结构中

我创建了两个视图控制器ViewControllerOne和DetailViewController。然后我对UIButton进行了操作，当按下按钮时，它将转到第二个视图控制器，

- (IBAction)loginButtonPressed:(UIButton *)sender {
self.loginButton.hidden= YES;
self.aview.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"authentication.png"]];

LAContext* context = [[LAContext alloc]init];
NSError* error = nil;

if ([context canEvaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error]) {
    [context evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics localizedReason:@"Authenticate with Touch ID" reply:^(BOOL success, NSError*error){
        if (success) {
            dispatch_async(dispatch_get_main_queue(), ^{
                self.loginButton.hidden= NO;
                self.aview.backgroundColor = [UIColor clearColor];
                DetailViewController* detailViewController = [[DetailViewController alloc]init];
              [self presentViewController:detailViewController animated:YES completion:nil];


            });  }

但它给了错误，

<ViewController: 0x7f97e9da7d60> whose view is not in the window hierarchy!

当按下按钮时，其移至DetailViewController，但屏幕为黑色，其未在DetailViewController中显示详细信息。

最佳答案

如果您已在Storyboard中添加了DetailViewController，则在实例化时可能必须从情节提要中引用相同的内容。

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"your_storyboard_name" bundle: nil];
DetailViewController *detailViewController = (DetailViewController*)[mainStoryboard instantiateViewControllerWithIdentifier: @"your_storyboard_identifier"];
[self presentViewController:detailViewController animated:YES completion:nil];

当您使用alloc / init初始化时，它只是实例化一个空白视图控制器。

关于ios - 警告-其 View 不在IOS 9的窗口层次结构中，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33140441/