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.

this is `let homevci = navigationController!.viewControllers!.first as! NBHomeVC` — Igor Bidiniuc, Jan 04 '17 at 14:56
but better way, you need to read some swift documentation. it is not objc-c :) — Igor Bidiniuc, Jan 04 '17 at 14:58
http://stackoverflow.com/questions/26667009/get-top-most-uiviewcontroller — Scriptable, Jan 04 '17 at 14:58
It works, thank you , I think I should think about the difference between [UIViewController] and array. — Remsay, Jan 04 '17 at 15:00

score 51 · Answer 1 · answered Jan 04 '17 at 14:58

51

You can get the root by,

self.navigationController!.viewControllers.first

answered Jan 04 '17 at 14:58

user6083088

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Bogdan Farca · Answer 2 · 2017-06-16T13:44:30.247

21

Or as an extension:

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

And then you use it like this:

if let rootv = navigationController?.rootViewController { }

edited Jun 16 '17 at 13:44

answered Jan 04 '17 at 14:59

Bogdan Farca

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Nice answer, but `as? UIViewController` can be removed because `first` already returns a `UIViewController?`. Also, in your second code snippet it should be `navigationController?.rootViewController` as it's an optional. – nyg Jun 15 '17 at 08:59
@nyg: Thanks for spotting it, I'm sure it worked at some point in the past, but too many Swift versions came and went ... It should work now in Swift 4. – Bogdan Farca Jun 16 '17 at 13:46

score 4 · Answer 3 · answered Feb 28 '18 at 07:26

4

Or maybe this can be used

self.navigationController.visibleViewController

or

self.navigationController.topViewController

answered Feb 28 '18 at 07:26

moonvader

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2

This is not the root view controller , This is the top view controller in the navigation controller stack , `topViewController` will be the root view controller if the navigation controller did not push any view controllers . – mazen Jun 20 '20 at 06:34

score 0 · Answer 4 · answered Jan 04 '17 at 14:58

0

replace

let homevci = controllerArray.objectAtIndex(0) as? NBHomeVC

with

let homevci = controllerArray.first as? NBHomeVC

or

let homevci = controllerArray[0] as? NBHomeVC

answered Jan 04 '17 at 14:58

Sameh Salama

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How can I get the rootViewController of UINavigationController

4 Answers4