从App Delegate swift执行Segue [英] Perform Segue from App Delegate swift

问题描述

我需要从app delegate启动一个视图控制器。

I need to launch a view controller from the app delegate.

在视图控制器之间执行segue的方式。

In the way you would perform a segue between view controllers.

我有一个if语句，如果true需要显示一个视图控制器，这是在app delegate中。

I have an if statement that if true needs to show a view controller, this is in the app delegate.

我如何从app委托？

推荐答案

c_rath的答案大多是正确的，但你不需要让视图控制器成为根视图控制器。实际上，您甚至可以从App Delegate触发导航堆栈顶视图和任何其他视图控制器之间的segue。例如，要推送故事板视图控制器，您可以执行以下操作：

c_rath's answer is mostly right, but you don't need to make the view controller a root view controller. You can in fact trigger a segue between the top view on the navigation stack and any other view controller, even from the App Delegate. For example, to push a storyboard view controller, you could do this:

Swift 3.0及更高版本

// Access the storyboard and fetch an instance of the view controller
let storyboard = UIStoryboard(name: "Main", bundle: nil);
let viewController: MainViewController = storyboard.instantiateViewController(withIdentifier: "ViewController") as! MainViewController;

// Then push that view controller onto the navigation stack
let rootViewController = self.window!.rootViewController as! UINavigationController;
rootViewController.pushViewController(viewController, animated: true);

Swift 2.0及早期

// Access the storyboard and fetch an instance of the view controller
var storyboard = UIStoryboard(name: "Main", bundle: nil)
var viewController: MainViewController = storyboard.instantiateViewControllerWithIdentifier("ViewController") as MainViewController

// Then push that view controller onto the navigation stack
var rootViewController = self.window!.rootViewController as UINavigationController
rootViewController.pushViewController(viewController, animated: true)

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