How can I get the rootViewController of UINavigationController

Question

I want to get the rootViewController of UINavigationController. It works in Objective-c, but when I use it in Swift , the error reminds me that it was wrong.

Code screenshot 1.

If I do this, add as! NSArray, it works, but also reminds me that "cast from '[UIViewController]' to unrelated type 'NSArray' always fails".

Code screenshot 2

Can somebody show a better way to get the `rootViewController`` without error. Thank you.

Answer 1

You can get the root by,

self.navigationController!.viewControllers.first

Answer 2

Or as an extension:

extension UINavigationController {
    var rootViewController : UIViewController? {
        return viewControllers.first
    }
}

And then you use it like this:

if let rootv = navigationController?.rootViewController { }

Answer 3

Or maybe this can be used

self.navigationController.visibleViewController

or

self.navigationController.topViewController