[英]Resetting the navigation stack on a UITabBarController doesn't work
我正在尝试在UINavigationController
嵌入的UITabViewController
的子类上重置导航堆栈,但是它不起作用。
我以编程方式创建的导航堆栈是这样的:
UINavigationController => ControllerA(UIViewController的子类)=> ControllerB(UIViewController的子类)=> ControllerC(UITabBarController的子类)。
当用户按下“后退”按钮或从ControllerC向后滑动时,该应用应返回到ControllerA,而不是ControllerB。
通常,当我想重置导航堆栈时,可以在Controller的viewDidLoad()
方法中进行此操作:
override func viewDidLoad() {
super.viewDidLoad()
// usually work, but not in a subclass of UITabBarController as self.navigationController is nil
if let navigationController = self.navigationController {
// keep only the root controller (0) and the current controller
navigationController.viewControllers = [navigationController.viewControllers[0], self]
}
}
但这在ControllerC( UITabViewController
的子类)中UITabViewController
因为self.navigationController
为nil。
如果我改为这样做(仍然在ControllerC的viewDidLoad()
方法中):
/// ControllerC's viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
if let navigationController = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
// keep only the root controller (0) and the current controller
navigationController.viewControllers = [navigationController.viewControllers[0], self]
}
}
这可行,但是当我这样做时,ControllerB和ControllerC之间没有动画:
controllerB.navigationController?.pushViewController(ControllerC(), animated: true)
我还尝试覆盖ControllerC的viewWillDisappear()
方法:
/// ControllerC's viewWillDisappear
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if self.isMovingFromParent {
if let navigationController = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
navigationController.popToRootViewController(animated: true)
}
}
这可以工作,但是在显示ControllerA之前短暂可见ControllerB。
任何帮助将不胜感激!
在ControllerC中,您可以像这样重写viewDidAppear()
而不是尝试重写viewWillDisappear()
方法:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
if let navC = UIApplication.shared.keyWindow?.rootViewController as? UINavigationController {
// keep only the root controller (0) and the current controller
navC.viewControllers = [navC.viewControllers[0], self]
}
}
当您向后浏览时,ControllerB在ControllerA之前不会短暂可见。
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