UIViewController no longer has members topViewController or viewControllers in XCode 7

Question

After updating to XCode 7 and converting my project to the latest Swift 2 syntax, there is one error I cannot seem to fix. I have a segue to a navigation controller and need to pass data to the top view controller in its stack. The following has always worked until now:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let destinationVC = segue.destinationViewController.viewControllers[0] as! MYViewController
    // OR let destinationVC = segue.destinationViewController.topViewController as! MYViewController
    // ...
}

But now the compiler gives error:

Value of type 'UIViewController' has no member 'viewControllers' or Value of type 'UIViewController' has no member 'topViewController'

I do not see how else to access the view controller(s) on the stack. Any ideas? Thanks in advance!

Answer 1

Add as! UINavigationController after segue.destinationViewController so that to cast to UINavigationController class type.

let destinationVC = (segue.destinationViewController as! UINavigationController).viewControllers[0] as! MYViewController

Or

let destinationVC = (segue.destinationViewController as! UINavigationController).topViewController as! MYViewController