视图不在窗口层次结构中的 iOS答案

【问题标题】：iOS whose view is not in the window hierarchy视图不在窗口层次结构中的 iOS
【发布时间】：2016-09-03 18:31:18
【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：尝试在 on 其视图不在窗口层次结构中！

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];

【问题讨论】：

从您呈现的位置 PassCodeController
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];改用 self.storyboard
AppDelegate *appDelegate = (AppDelegate *) [[UIApplication sharedApplication] delegate]; appDelegate.window.rootViewcontroller 存在...
@PKT 这与情节提要无关，请大家避免
谢谢大家。这段代码对我有用： OTPViewController *lOTPViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"OTPViewController"]; lOTPViewController.comingFromReg = true; [self.navigationController pushViewController:lOTPViewController 动画：YES];

标签： ios objective-c uiview uinavigationcontroller presentviewcontroller

【解决方案1】：

这是因为两个视图控制器同时存在和关闭，或者您试图在视图控制器打开 ViewDidload 方法时立即显示视图控制器

第一：

从viewDidAppear 方法或代替ViewDidload 提供ViewController。

第二：

我建议使用完成方法来呈现和关闭 viewcontrolelr，如下例所示：

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

        }];

更新：

创建一个显示 OTPViewController 的单独方法，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 以 1 秒的延迟调用此方法

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

你需要把上面的performselect代码放在

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

【讨论】：

是的，问题是 otp vc 已被解雇，您立即呈现新 vc，因此在解雇和新 vc 呈现之间添加 1-2 秒延迟
我现在正在吃午饭，我会在 15 分钟内更新答案??
让我们continue this discussion in chat。

【解决方案2】：

尝试从rootViewController呈现，

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

【讨论】：

@Vijay .....检查更新的问题...stackoverflow.com/q/37110406/6285383
代替 self 关键字来呈现您的视图控制器尝试使用 self.view.window.rootViewController。在您遇到该错误的地方使用此代码！

【解决方案3】：

使用下面的代码行..

// 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];

【讨论】：