objective-c - 登录 View 之前的模态视图屏幕

Question

我是一名 iOS 开发新手，我有一个关于如何向登录页面添加 View 的问题。目前我有一个登录页面，我想做的是在登录页面可见之前，另一个模态视图应该在它之前，用户必须首先关闭。我如何在 xcode 中添加它？

Answer 1

这里有几个用于呈现 View Controller 的选项。

- (IBAction)goToLoginView:(id)sender
{
     //if you are using xibs use this line
     UIViewController *controller = [[UIViewController alloc] initWithNibName:@"myXib" bundle:[NSBundle mainBundle]];
     //if you are using storyboards use this line
     UIViewController *controller = [self.storyboard instantiateViewControllerWithIdentifier:@"myViewControllersID"];

     //to present the controller modally use this
     [self presentViewController:controller animated:YES completion:nil];
     //or if you are pushing to this controller using a navigation controller use this
     [self.navigationController pushViewController:controller animated:YES];
}

然后要关闭 View Controller ，请使用以下命令:

- (IBAction)closeMyController
{
    //if the view was presented modally close it with this
    [self dismissViewControllerAnimated:YES completion:nil];

    //and to pop back up the navigation stack
    [self.navigationController popToRootViewControllerAnimated:YES];
}