视图不在窗口层次结构中的 iOS

问题描述

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:尝试呈现 <OTPController: 0x1e56e0a0 > on 其视图不在窗口层次结构中！

Warning: Attempt to present < OTPController: 0x1e56e0a0 > on < PassCodeController: 0x1ec3e000> whose view is not in the window hierarchy!

这是我用来在视图之间切换的代码:

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

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

我正在从 RegistrationViewController 展示密码控制器:

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

推荐答案

这是因为两个viewcontroller同时存在和dismiss，或者你试图在viewcontroller打开时立即展示ViewController ViewDidload方法如此

That happen because of two viewcontroller present and dismiss at a same time or you are trying to present ViewController immediately at the viewcontroller open ViewDidload method so

第一:

• 从 viewDidAppear 方法中呈现 ViewController 或代替 ViewDidload.

• Present ViewController from viewDidAppear Method or instead of ViewDidload.

第二:

我建议使用完成方法来呈现和关闭 viewcontrolelr，如下例所示:

I suggest to make use of completion method for present and dismiss viewcontrolelr like following example:

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

        }];

更新:

创建一个显示 OTPViewController 的单独方法，如下所示:

Create a separate method of presenting a OTPViewController like following:

-(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 performSelector

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

你需要把上面的performselect代码放在

You need to put above performselect code in

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

t

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