从视图控制器调用app delegate方法 [英] Call app delegate method from view controller

问题描述

我想知道我是否可以从另一个ViewController调用app delegate方法。

I want to know if I can call an app delegate method from another ViewController.

当应用启动时，应用程序（应用程序： UIApplication，didFinishLaunchingWithOptions launchOptions：[NSObject：AnyObject]？） - > Bool 调用i方法。我可以从另一个视图控制器再次调用此方法吗？

When the app starts, the application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool i method is called. Can I call this method a second time from another view controller?

推荐答案

不确定为什么要这样做。您可能不应该，但为了回答这里的问题，它是：

Not sure why you want to do this. You probably shouldn't, but for the purpose of answering the question here it is:

// get a reference to the app delegate
let appDelegate: AppDelegate? = UIApplication.shared.delegate as? AppDelegate

// call didFinishLaunchWithOptions ... why?
appDelegate?.application(UIApplication.shared, didFinishLaunchingWithOptions: nil)

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