返回到根导航控制器的按钮

Question

我正在使用故事板并且有 3 个 VC。当我在 VC3 上时，我希望后退按钮跳过 VC2 并转到 VC1。

我尝试了以下方法，但在我到达 VC1 之前 VC2 会闪烁

override func viewWillDisappear(_ animated: Bool) {
    self.navigationController?.popViewController(animated: true)
}

我的自定义返回码：

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
    self.navigationController?.navigationBar.shadowImage = UIImage()
    self.navigationController?.navigationBar.isTranslucent = true
    self.navigationController?.navigationBar.backIndicatorImage = UIImage(named: "arrow_back")
    self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named: "arrow_back")
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .plain, target: nil, action: #selector(self.backPressed(_:)))
    self.navigationController?.navigationBar.barStyle = .black  
}

@objc func backPressed(_ sender: Any){
    print("here")
    self.navigationController?.popToRootViewController(animated: false)
}

Answer 1

viewDidLoad 的变化

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
    self.navigationController?.navigationBar.shadowImage = UIImage()
    self.navigationController?.navigationBar.isTranslucent = true
    self.navigationController?.navigationBar.backIndicatorImage = UIImage(named: "arrow_back")
    self.navigationController?.navigationBar.backIndicatorTransitionMaskImage = UIImage(named: "arrow_back")

     var backButton = UIBarButtonItem(title: "", style: .plain, target: self, action: #selector(backPressed(_:)))
     navigationController?.navigationBar.topItem?.backBarButtonItem = backButton
    self.navigationController?.navigationBar.barStyle = .black  
}

添加 如果你想在第一个控制器使用

@objc func backPressed(_ sender: Any){
     self.navigationController?.popToRootViewController(animated: true) 
}

如果它不是导航控制器中的第一个视图控制器

@objc func backPressed(_ sender: Any){
     let controllerToBeReached = navigationController!.viewControllers.filter { $0 is YourViewController }.first!
     navigationController!.popToViewController(controllerToBeReached, animated: true)
}

Answer 2

如果您不想在 VC1 出现之前看到 VC2 闪烁，并且如果 VC1 是根目录，则只需设置 animated = false

从您的 VC3 覆盖操作，然后使用：self.navigationController?.popToRootViewController(animated: false)

Answer 3

在您的代码返回按钮中自动执行popToViewController 比viewWillDisappear 方法调用，以便您在VC2 上闪烁

在 VC3 中添加 Back BarButtonitem 以执行转到 VC3 到 VC1 的操作

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

这里方法返回UIBarButtonItem

@objc func back(sender: UIBarButtonItem) {
    let vc = VC1()
    self.navigationController.popToViewController(vc, animated: true) 
}