按下导航后退按钮可返回到根目录

Question

我有一种方法可以检查何时按下导航栏中的后退按钮，并且该方法返回到根页面，但是由于某种原因，当self.navigationController?.popToRootViewController(animated: true)仅返回到上一页时。有谁知道按下导航栏的“后退”按钮时如何回到根目录？

override func didMove(toParentViewController parent: UIViewController?) {
    super.didMove(toParentViewController: parent)

    if parent == nil{
        self.navigationController?.popToRootViewController(animated: true)

    }

}

在this问题中，他询问如何使用哪种方法来自定义后退按钮。在我的代码中，它能够检测到用户何时按下后退按钮和self.navigationController?.popToRootViewController(animated: true) 来将页面带回到根页面，但是系统中有些东西阻止我的应用返回根页面。

Answer 1

我认为最好的方法是在此页面上创建自己的自定义后退按钮

override func viewDidLoad {
    super.viewDidLoad()
    navigationItem.hidesBackButton = true
    let newBackButton = UIBarButtonItem(title: "Back", style: UIBarButtonItemStyle.plain, target: self, action: #selector(YourViewController.back(sender:)))
    navigationItem.leftBarButtonItem = newBackButton
}

func back(sender: UIBarButtonItem) {
    // Perform your custom actions
    // ...
    // Go back to the root ViewController
    _ = navigationController?.popToRootViewController(animated: true)
}

通过“ fr33g”获得此答案的信用：Execute action when back bar button of UINavigationController is pressed

Answer 2

我个人不建议您尝试实现的目标，但是无论如何，这是一种无需自定义后退按钮的解决方案。

实施步骤

通过子类
1. 创建 CustomNavigationController XmlDocument xDoc = new XmlDocument(); XmlNodeList nodes = xDoc.SelectNodes("//element[@name='TranslateMe']");
2. 覆盖UINavigationController
3. 当popViewController(animated:)符合ViewController且
   • Navigationable返回shouldCustomNavigationControllerPopToRoot()，致电true
   • 否则，请正常弹出super.popToRootViewController

源代码

自定义导航控制器

ViewController

符合import UIKit class CustomNavigationController: UINavigationController { // MARK: - Initializers override init(rootViewController: UIViewController) { super.init(rootViewController: rootViewController) initialSetup() } required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) initialSetup() } // MARK: - Setups private func initialSetup() { // DISCLAIMER: This code does not support `interactivePopGestureRecognizer`, therefore we disable it interactivePopGestureRecognizer?.delegate = nil } // MARK: - Overrides override func popViewController(animated: Bool) -> UIViewController? { if shouldNavigationPopToRoot { return super.popToRootViewController(animated: animated)?.last } return super.popViewController(animated: animated) } // MARK: - Helpers private var shouldNavigationPopToRoot: Bool { return (topViewController as? Navigationable)?.shouldCustomNavigationControllerPopToRoot() == true } }

的View Controller

Navigationable

输出