How to pop to root view controller on UITabBarItem switch?

Question

我有一个带有两个UINavigationController的UITabBarController ，当我从一个TabBarItem切换到另一个时，先前选择的视图控制器应弹出到其根视图控制器。

Answer 1

Implement the UITabBarControllerDelegate tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) method like this:

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
   if let navigationController = viewController as? UINavigationController{
       navigationController.popToRootViewController(animated: false)
   }
   return true
}