ios - 导航 Controller

Question

在我的应用程序中，我有一个导航 Controller 。我添加了一个后退按钮以转到登录屏幕(UIViewController)。如何从导航 Controller 返回登录屏幕？

这是我的后退按钮的代码。

(void)viewDidLoad
{

    [super viewDidLoad];

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonSystemItemCancel target:self action:@selector(goBacktoLogin)];

    self.navigationItem.leftBarButtonItem = backButton;

}

(void) goBacktoLogin

{

    LoginViewController *loginViewController = [[ LoginViewController alloc] initWithNibName:@"LoginViewController" bundle:nil];

[[ self navigationController] popToViewController:loginViewController animated:YES];


}

我收到以下错误:

* Terminating app due to uncaught exception 'NSInternalInconsistencyException',

reason: 'Tried to pop to a view controller that doesn't exist.'

Answer 1

如果您需要返回导航层次结构中的第一个 View Controller ，请使用:

[self.navigationController popToRootViewControllerAnimated:YES];