视图不在窗口层次结构中的 iOS

当我从 PassCode 控制器移动到 OTP ViewController 时，我在控制台中收到以下错误：

警告：尝试在 PassCodeController: 0x1ec3e000> 其视图不在窗口层次结构中！

这是我用来在视图之间更改的代码：

UIStoryboard  *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    OTPViewController *lOTPViewController = [storyboard instantiateViewControllerWithIdentifier:@"OTPViewController"];
    lOTPViewController.comingFromReg = true;

    [self presentViewController:lOTPViewController animated:YES
                     completion:nil];

我正在展示来自注册视图控制器的密码控制器：

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
        PassCodeViewController *passVC =  [storyboard instantiateViewControllerWithIdentifier:@"PassCodeViewController"];
        [self presentViewController:passVC animated:YES completion:nil];

发生这种情况是因为两个视图控制器同时存在并关闭，或者您试图在视图控制器打开时立即呈现 ViewControllerViewDidload方法如此

First:

• 当前 ViewController 来自viewDidAppear方法或代替ViewDidload.

Second:

我建议使用完成方法来呈现并关闭 viewcontrolelr，如下例所示：

[self presentViewController:lOTPViewController animated:YES
                             completion:^{

        }];

UPDATE:

创建一个单独的方法来呈现 OTPViewController，如下所示：

-(void)PresentOTPViewController
{

    UIStoryboard  *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    OTPViewController *lOTPViewController = [storyboard instantiateViewControllerWithIdentifier:@"OTPViewController"];
    lOTPViewController.comingFromReg = true;

    [self presentViewController:lOTPViewController animated:YES
                     completion:^{}];

}

现在使用 1 秒延迟调用此方法performSelector

[self performSelector:@selector(PresentOTPViewController) withObject:self afterDelay:1.0 ];

您需要将上面的执行选择代码放入

[self dismissViewControllerAnimated:YES completion:^{
 [self performSelector:@selector(PresentOTPViewController) withObject:self afterDelay:1.0 ];
}]; // this is the dismiss method of PassCodeViewController

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