Swift: how does the application delegate get a link to the view controller?

Question

I started a new Swift project, I play with things to see how wiring works with downstream versions since I have never used them before.

A project is a single-view application using the default storyboard created by Xcode 6.1. It generates the classes AppDelegate.swift and ViewController.swift, as well as Main.storyboard.

Btw, I kind of left this lesson:

http://www.raywenderlich.com/74904/swift-tutorial-part-2-simple-ios-app

I have a button work and several textview controls that I added using the storyboard interface designer.

What I would like to do now, connect the didFinishLaunching application delegation application to the view controller.

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { } 

I found many StackOverflow articles discussing this, however all examples create an instance of your own view controller. I just want to get a link to the view controller that was launched through the storyboard.

What is the best way to do this? Feel free to tell me the relevant documents or other messages.

Answer 1

I finally found this article on checking the current view controller , which contained the logic I was looking for:

 var myViewController : ViewController! ... if let viewControllers = self.window?.rootViewController?.childViewControllers { for viewController in viewControllers { if viewController.isKindOfClass(ViewController) { myViewController = viewController as ViewController println("Found the view controller") } } }