在 Tab Bar 应用程序上弹出所有视图控制器

Question

I have a tab bar app with navigation controllers on 4 out of the 5 tabs on the app. I have a 'reset app' function within my app which clears all data etc... and I would also like that to pop all of the view controllers back to their top view. I know how to pop to root using popToRootViewControllerAnimated for a single nav controller but is it possible to pop all of the view controllers on each tab?

Answer 1

You need to enumerate through viewControllers array of tabBarController & pop to root view controller if controller in array is UINavigationController like-

for(UIViewController *viewController in tabBarController.viewControllers)
{
    if([viewController isKindOfClass:[UINavigationController class]])
       [(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
}

Answer 2

Rahul's answer is perfect solution. But if there are more than 5 tabs in your tabbar then you will see the "more" tab. you will need to reset this tab explicitly (just pop tabBarController.moreNavigationController to rootViewController).

here is code example:

for(UIViewController *viewController in tabBarController.viewControllers)
{
    if([viewController isKindOfClass:[UINavigationController class]])
       [(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
}
[tabBarController.moreNavigationController popToRootViewControllerAnimated:NO];

Answer 3

Here's Swift 5 for anyone that needs it:

if let tabVcs = navigationController?.tabBarController?.viewControllers {
        for vc in tabVcs {
            if let navVc = vc as? UINavigationController {
                navVc.popToRootViewController(animated: false)
            }
        }
    }

Answer 4

Another option you have is to use NSNotifications. I needed to trigger a popToRootViewController on all of my tabs when closing a modal view (slide show on timer) and this is the only way I could figure out how to do it. I triggered the NSNotification in viewWillDissapear method of modal view and then responded to it in each view I wished to close.

Answer 5

func popAll(){

    let tabBarController = window!.rootViewController as! UITabBarController
    tabBarController.delegate = self

    if let tabBarViewControllers = tabBarController.viewControllers {


    let campusController = tabBarViewControllers[0] as! UINavigationController

    let campusTVC = campusController.viewControllers[0] as! CampusTVC

    _ = campusTVC.navigationController?.popToRootViewController(animated: false)

    let adController = tabBarViewControllers[1] as! UINavigationController

    let adminTVC = adminController.viewControllers[0] as! AdTVC

    _ = adminTVC.navigationController?.popToRootViewController(animated: false)

    let searchController = tabBarViewControllers[2] as! UINavigationController

    let searchTVC = searchController.viewControllers[0] as! SearchTVC
    _ = searchTVC.navigationController?.popToRootViewController(animated: false)


    } 

}

Example of my code popping all tabs in Swift. This is in my App Delegate. This is how I call it in my VC

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.popAll()