ios - 警告“尝试呈现其 View 不在窗口层次结构中的 ViewController - Objective C

Question

我正在尝试调用 Controller ，如果有响应错误，则将用户重定向到登录 Controller 。

 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"EventManagerStoryboard" bundle:[NSBundle mainBundle]];
LoginViewController *loginController = [storyboard instantiateViewControllerWithIdentifier:@"loginID"];
[loginController viewDidLoad];
loginController.showOnlyLoginForm = YES;

[self presentViewController:loginController animated:YES completion:Nil];

我面临这个警告 -

Attempt to present Attempt to present LoginViewController: 0x7fc958201130 on ProfileController: 0x7fc9583118e0 whose view is not in the window hierarchy!

Answer 1

不要在 viewDidLoad 中运行这段代码，在 viewDidAppear 中试试

 [self presentViewController:loginController animated:YES completion:Nil];

编辑:

如果您实现了 navigationController，则在 appDelegate 中使用

 [(UINavigationController *)self.window.rootViewController pushViewController:vc animated:YES];