swift - How can I reach 2nd tab navigation stack from 1st tab?

Question

I have a TabBarController with 2 tabs, and each of them is NavigationController with UIViewControllers.

And, when I do some action at the 1st tab, I need be able to move one of UIViews on the 2nd tab to the top of the stack.

How can I reach 2nd tab navigation stack from 1st tab?

I don't want switch to 2nd tab, only move its UIview to the top of its stack

p.s. for example,

    TabbarController
       Tab1
         NavigationController1
          ViewController1
          ViewController2
       Tab2
         NavigationController2
          ViewController3

so from ViewController3 be able to put ViewController2 to the top of the stack NavigationController1

Do you want to show 2nd tab? Or do you just need to change stack of navigation controller in second VC? — Robert Dresler, Jan 09 '19 at 10:48
Without clicking anywhere you want to go to the second tab? @nastassia — Abhishek Jadhav, Jan 09 '19 at 10:55
self.tabBarController?.selectedIndex = 0 you can implement like this @nastassia 0 is your 2nd tab then you can directly move to your viewController1 — Abhishek Jadhav, Jan 09 '19 at 11:01
@AbhishekJadhav I don't want move to 2nd tab, only move its UIview to the top of its stack — nastassia, Jan 09 '19 at 11:17
@RobertDresler your solution works great, why did you delete post? thank you so much anyway! — nastassia, Jan 09 '19 at 11:33
@nastassia oh! I'm glad! I tried in my code and it'd not worked because I'd tried it with wrong index of tab... :D — Robert Dresler, Jan 09 '19 at 11:36

Robert Dresler · Accepted Answer · 2019-01-09T11:37:08.103

From ViewController3 get reference for navigation controller embed in first tab (NavigationController1) and then try to downcast it as UINavigationController. Then just call popToRootViewController(animated:) on this navigation controller

if let navigationController = tabBarController?.viewControllers?[0] as? UINavigationController {
    navigationController.popToRootViewController(animated: true) // or `animated: false`
}

score -1 · Answer 2 · answered Jan 09 '19 at 11:09

-1

I hope this helps you!!

self.tabBarController?.selectedIndex = 0

answered Jan 09 '19 at 11:09

Abhishek Jadhav

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swift - How can I reach 2nd tab navigation stack from 1st tab?

2 Answers2