iOS:以编程方式呈现视图控制器 [英] iOS: present view controller programmatically

问题描述

我正在使用presentViewController:animated:completion:方法转到另一个视图控制器.

I'm using the presentViewController:animated:completion: method to go to another view controller.

这是我的代码:

AddTaskViewController *add = [[AddTaskViewController alloc] init];
[self presentViewController:add animated:YES completion:nil];

此代码转到另一个UIViewController，但是另一个控制器为空.我一直在使用情节提要，但现在我需要用代码来完成.

This code goes to the other UIViewController but the other controller is empty. I've always been using storyboards but now I need this to be done in code.

推荐答案

如果使用情节提要，则可能不应该使用alloc和init创建新的视图控制器.相反，请查看您的情节提要，找到要执行的 segue ；它应该具有唯一的标识符(如果没有，则可以在右侧栏中设置一个).

If you're using a storyboard, you probably shouldn't be using alloc and init to create a new view controller. Instead, look at your storyboard and find the segue that you want to perform; it should have a unique identifier (and if not, you can set one in the right sidebar).

找到该序列的标识符后，向 current 视图控制器发送-performSegueWithIdentifier:sender消息:

Once you've found the identifier for that segue, send your current view controller a -performSegueWithIdentifier:sender message:

[self performSegueWithIdentifier:@"mySegueIdentifier" sender:self];

这将使情节提要板实例化AddTaskViewController并以您为该脚本定义的方式呈现它.

This will cause the storyboard to instantiate an AddTaskViewController and present it in the way that you've defined for that segue.

另一方面，如果您根本不使用情节提要，那么您需要为AddTaskViewController提供某种用户界面.最常见的方法是使用nib初始化控制器:您将调用-initWithNibName:bundle:而不是仅调用init并提供包含添加任务UI的.xib文件的名称:

If, on the other hand, you're not using a storyboard at all, then you need to give your AddTaskViewController some kind of user interface. The most common way of doing so is to initialize the controller with a nib: instead of just calling init, you'll call -initWithNibName:bundle: and provide the name of a .xib file that contains your add-task UI:

AddTaskViewController *add = [[AddTaskViewController alloc]
                              initWithNibName:@"AddTaskView" bundle:nil];
[self presentViewController:add animated:YES completion:nil];

(还有其他(较不常见)的方法来获取与新视图控制器关联的视图，但这可能使您工作起来的麻烦最少.)

(There are other (less common) ways of getting a view associated with your new view controller, but this will probably present you the least trouble to get working.)

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