从视图控制器调用应用程序委托方法 [英] Call app delegate method from view controller

问题描述

我想知道是否可以从另一个 ViewController 调用应用程序委托方法.

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

当应用程序启动时，application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) ->Bool i 方法被调用.我可以从另一个视图控制器第二次调用这个方法吗?

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

不确定您为什么要这样做.你可能不应该，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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