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I want to know if I can call an app delegate method from another ViewController.
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?
752
The app delegate is effectively the root object of your app, and it works in conjunction with UIApplication to manage some interactions with the system. Like the UIApplication object, UIKit creates your app delegate object early in your app's launch cycle so it's always present.
The application delegate is a controller object. By default, it is the owner and controller of the main window -- which is a view -- in an iOS app. The app delegate receives messages from an object representing -- or modeling -- the application itself (an instance of UIApplication ).
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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