我在我的应用程序中设置这样的 rootViewController。
func setupMainView() {
let rootViewContorller = window?.rootViewController
if (rootViewContorller?.presentedViewController != nil || rootViewContorller?.presentingViewController != nil) {
rootViewContorller?.dismiss(animated: false, completion: nil)
}
let tabbarController = UITabBarController()
tabbarController.delegate = self
let homeViewController = HomeViewController()
let rewardsViewController = RewardsViewController()
let homeNVc = UINavigationController()
let rewardsNVc = UINavigationController()
homeNVc.viewControllers = [homeViewController]
rewardsNVc.viewControllers = [rewardsViewController]
tabbarController.viewControllers = []
tabbarController.viewControllers = [homeNVc, rewardsNVc]
tabbarController.selectedIndex = 0
self.window?.rootViewController = tabbarController
}
它工作正常。但是我必须在应用程序中更改 rootViewController,比如在注册后等。之后当我去Debug View Hierarchy
. 我仍然在那里看到registrationViewController。假设我将 rootViewController 更改 3-4 次,所有以前的控制器仍然存在。所以我的问题是如何在更改 rootViewController 之前从内存中删除所有 viewController。