Question

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

警告：尝试出示＆lt; OTPController：0x1e56e0a0＆gt; on＆lt; PassCodeController：0x1ec3e000＆gt;其视图不在窗口层次结构中！

这是我用来更改观看次数的代码：

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

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

我将从RegistrationViewController呈现PassCode控制器：

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

Answer 1

发生这种情况是因为两个viewcontroller同时存在和解除，或者你试图在viewcontroller open ViewDidload方法中立即呈现ViewController所以

<强>首先

从viewDidAppear方法或代替ViewDidload。

<强>第二

我建议使用目前的完成方法并解除viewcontrolelr，如下例所示：

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

        }];

<强>更新

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performSelector

使用1秒Delaya调用此方法

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

您需要在

中添加以上performselect代码

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

吨

Answer 2

尝试从rootViewController中显示它，

[self.view.window.rootViewController presentViewController:lOTPViewController animated:YES completion:nil];

Answer 3

使用以下代码行..

// you need to create UIStoryboard object by giving name of your storyboard
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
// here you need to create storyboard ID of perticular view where you need to navigate your app 
UIViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier:@"viewContIdentifire"];

// if use presentViewController this will not enables you to go back to previous view
[self presentViewController:vc animated:NO completion:nil];
                        **// OR**
// using pushViewController lets you to go back to the previous view
[self.navigationController pushViewController:vc animated:YES];

iOS视图不在窗口层次结构中的

3 个答案: