Swift: Determine Active View Controller when applicationDidEnterBackground is called

Question

Is there a way for me to determine the ViewController that was active when a user hits the Home button and the app delegate function applicationDidEnterBackground function is called?

Have a look here: http://stackoverflow.com/questions/24825123/get-the-current-view-controller-from-the-app-delegate — ppalancica, Apr 08 '16 at 18:22
I'm not very good with Objective-C, but I'll try to translate this post to Swift. :) — GED125, Apr 08 '16 at 18:24

score 1 · Accepted Answer · answered Apr 08 '16 at 18:34

So this line:

let vc: UIViewController = self.window!.rootViewController!

will give you the root view controller in Swift (assuming that you use that line in some method inside AppDelegate), but if you have containers (such as UITabBarController) -- you may need to go on that hierarchy for additional checks/inspections...

Swift: Determine Active View Controller when applicationDidEnterBackground is called

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