CODEWITHSUNDEEP
iosuinavigationcontrolleruitabbarcontrolleruisplitviewcontrolleruitabbar
Steve Moser
Steve Moser

Reputation: 7807

How to pop to root after double tapping a tab bar item?

Normally when a UINavigationController is placed in a UITabBarController the navigation controller pops to root with the respective tab it is in is double tapped. How do I achieve the same effect with a UISplitViewController is between the tab bar controller and the navigation controller? Ideally it would recurse through the view controller's child view controllers and calling popToRootViewController on all navigation controllers that it finds. Do I have to add my own gesture recognizer to the tab bar since it doesn't look like there is a hook for knowing when a user has double tapped a tab?

Upvotes: 1

Views: 2448

Answers (2)

Martin Žid
Martin Žid

Reputation: 299

In Swift 4, it can go something like this:

class TabBarViewController: UITabBarController, UITabBarControllerDelegate {

    private var shouldSelectIndex = -1

    override func viewDidLoad() {
        super.viewDidLoad()
        delegate = self
    }

    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
        shouldSelectIndex = tabBarController.selectedIndex
        return true
    }

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        if shouldSelectIndex == tabBarController.selectedIndex {
            if let splitViewController = viewController as? UISplitViewController {
                if let navController = splitViewController.viewControllers[0] as? UINavigationController {
                    navController.popToRootViewController(animated: true)
                }
            }
        }
    }
}

Upvotes: 3

Steve Moser
Steve Moser

Reputation: 7807

Instead of setting up a UIGestureRecognizer I simply keep track of the selected index in shouldSelectViewController and popped to root on my master navigation controller in didSelectViewController if the old selected index was the same as the new one.

Upvotes: 3

Related Questions