popping to root view controller

Question

I have an alert whose OK button should pop to the root view controller.

Here's the structure of what I'm working with:

[tab view controller] -> [navigation controller] -> [view controller] -> [view controller] -> [navigation controller] -> [view controller] -> [alert]

I would like the OK button on the alert take me to the view controller I've bolded above. When I do the code below, I go back to the view controller I've italicized above, which isn't quite what I want. Any help would be much appreciated! Thanks!

alert.addAction(UIAlertAction(title: OK, style: UIAlertActionStyle.default, handler: { action in

    DispatchQueue.main.async(execute: {
        _ = self.dismiss(animated: true, completion: nil)

    })
}))

I have also tried using the special method for popping to the root view controller, but this has not worked, sadly.

how do you used this once `[view controller] -> [view controller] `, the segue type as PUSH or present — Anbu.Karthik, May 08 '17 at 05:56
which view Controller is it opening. If you can tell me which ViewController opens from your viewHierarchy graph then I can help you out — Md. Ibrahim Hassan, May 08 '17 at 06:16
it opens the one in italics (slanted letters), after the bold one — mlecoz, May 08 '17 at 06:19
The ViewController is the ViewController in which your naviagtion controller is present. — Md. Ibrahim Hassan, May 08 '17 at 06:24
Get a reference to the first navigationController and call the popToRootViewController for that NavigationController — Md. Ibrahim Hassan, May 08 '17 at 06:25
`UIAlertAction` blocks already execute on the main thread. You shouldn't need the GCD in your code. — Tom Testicool, May 08 '17 at 06:39

score 7 · Accepted Answer · edited May 23 '17 at 10:31

7

The UINavigationViewController class has a method func popToRootViewController(animated: Bool) -> [UIViewController]? (Documentation)

You can just call this method on the fist navigation view controller. (Note: Therefore you need to have a reference to this navigation view controller or delegates to call this method)

If you use a Storyboard you can use a segue to unwind to the correct view controller. Therefore see this post.

edited May 23 '17 at 10:31

Community

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answered May 08 '17 at 05:56

Nef10

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I have tried using popToRootViewController, but I've had some issues. Based on your answer, it might be because I am calling it on the later navigationViewController. How do I access the first navigation view controller? – mlecoz May 08 '17 at 06:01
(how do I access it from the very last view controller, that is) – mlecoz May 08 '17 at 06:03
Yes, you need to call it on the first navigation view controller. And yes, therefore you need to keep a reference. Are you using a Storyboard? Than segues might help you (see [here](http://stackoverflow.com/questions/38681691/how-to-pop-back-to-a-view-in-a-different-navigation-controller?rq=1)) Otherwise either create delegates along the way or store it somewhere you can access (maybe in the later navigation view controller if you have a subclass?) - Sorry not easy to answer without knowing more of your code :) – Nef10 May 08 '17 at 06:05
I am using a storyboard. I just checked out that link, and I see that it suggests unwinding. I actually tried that already and had the same problem! I did so using this tutorial (https://www.andrewcbancroft.com/2015/12/18/working-with-unwind-segues-programmatically-in-swift/), which has successfully worked for me in the past. Is there anything else that I can tell you about my code that might help? – mlecoz May 08 '17 at 06:15
What exactly is the problem when using the unwind segue? – Nef10 May 08 '17 at 06:20
Oh, IT JUST STARTED WORKING!! I checked over my work and realized I put my IBAction unwind function in the wrong file on accident! It works now, at long last! Thanks for the help @Nef10 – mlecoz May 08 '17 at 06:30
No problem, glad to help. – Nef10 May 08 '17 at 06:32
Do you happen to know how I might access my tabBarController from my very last view controller? I ask because there are two possible view controllers I'd want to unwind to, depending on which tab I'm on. self.tabBarController is nil in that last view controller. – mlecoz May 08 '17 at 19:13
Try the first line of code in Bilals answer - it is not the best way (IMHO) but should work. Cleaner would still be creating appropriate delegates or have references at the right positions – Nef10 May 08 '17 at 19:17
I actually did try his/her first line, and it didn't work! Maybe I'll just go the delegate route. Thanks again! – mlecoz May 08 '17 at 19:55

score 0 · Answer 2 · edited May 08 '17 at 09:09

0

You need to navigate the particular index of navigate stack. E.g:- First get the count of view controllers present in navigation stack. Pop to particular index. In you case may be its index is 0:

let arr_controller:[UIViewController] = (self.navigationController?.viewControllers)!
_ = self.navigationController?.popToViewController(arr_controller[0], animated: true)

edited May 08 '17 at 09:09

Ahmad F

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answered May 08 '17 at 06:16

Prit_Singh

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score 0 · Answer 3 · answered May 08 '17 at 07:46

0

let tabVc = (UIApplication.shared.delegate as! AppDelegate).window?.rootViewController as? UITabBarController
tabVc?.selectedViewController?.navigationController?.popToRootViewController(animated: true)

answered May 08 '17 at 07:46

Bilal

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popping to root view controller

3 Answers3