设置 leftBarButtonItem 后如何在 UINavigationController 中启用后退/左滑手势？

首先在 viewDidLoad 中设置委托：

self.navigationController.interactivePopGestureRecognizer.delegate = self;

然后在推送时禁用手势：

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    [super pushViewController:viewController animated:animated];
    self.interactivePopGestureRecognizer.enabled = NO;
}

并在 viewDidDisappear 中启用：

self.navigationController.interactivePopGestureRecognizer.enabled = YES;

此外，将 UINavigationControllerDelegate 添加到您的视图控制器。

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您需要处理两种情况：

当您将新视图推送到堆栈时当您显示根视图控制器时

如果你只需要一个可以使用的基类，这里有一个 Swift 3 版本：

import UIKit

final class SwipeNavigationController: UINavigationController {
    
    // MARK: - Lifecycle
    
    override init(rootViewController: UIViewController) {
        super.init(rootViewController: rootViewController)

         delegate = self
    }
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        
        delegate = self
    }

    required init?(coder aDecoder: NSCoder) { 
        super.init(coder: aDecoder) 

        delegate = self 
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // This needs to be in here, not in init
        interactivePopGestureRecognizer?.delegate = self
    }
    
    deinit {
        delegate = nil
        interactivePopGestureRecognizer?.delegate = nil
    }
    
    // MARK: - Overrides
    
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        duringPushAnimation = true
        
        super.pushViewController(viewController, animated: animated)
    }
    
    // MARK: - Private Properties
    
    fileprivate var duringPushAnimation = false

}

// MARK: - UINavigationControllerDelegate

extension SwipeNavigationController: UINavigationControllerDelegate {
    
    func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
        guard let swipeNavigationController = navigationController as? SwipeNavigationController else { return }
        
        swipeNavigationController.duringPushAnimation = false
    }
    
}

// MARK: - UIGestureRecognizerDelegate

extension SwipeNavigationController: UIGestureRecognizerDelegate {
    
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        guard gestureRecognizer == interactivePopGestureRecognizer else {
            return true // default value
        }
        
        // Disable pop gesture in two situations:
        // 1) when the pop animation is in progress
        // 2) when user swipes quickly a couple of times and animations don't have time to be performed
        return viewControllers.count > 1 && duringPushAnimation == false
    }
}

如果您最终需要在另一个类中充当 UINavigationControllerDelegate，您可以编写委托转发器 similar to this answer。

改编自 Objective-C 中的源代码：https://github.com/fastred/AHKNavigationController

---

当我设置委托时它对我有用

self.navigationController.interactivePopGestureRecognizer.delegate = self;

然后实施

迅速

extension MyViewController:UIGestureRecognizerDelegate {
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
}

Objective-C

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

---

它适用于我 Swift 3：

    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }

在 ViewDidLoad 中：

    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true

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这是在 iOS 10、Swift 3 中启用/禁用滑动到弹出视图控制器的最佳方法：

对于第一个屏幕 [您要禁用滑动手势的位置]：

class SignUpViewController : UIViewController,UIGestureRecognizerDelegate {

//MARK: - View initializers
override func viewDidLoad() {
    super.viewDidLoad()
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    swipeToPop()
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

func swipeToPop() {

    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true;
    self.navigationController?.interactivePopGestureRecognizer?.delegate = self;
}

func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {

    if gestureRecognizer == self.navigationController?.interactivePopGestureRecognizer {
        return false
    }
    return true
} }

对于中间屏幕 [您要启用滑动手势的位置]：

class FriendListViewController : UIViewController {

//MARK: - View initializers
override func viewDidLoad() {

    super.viewDidLoad()
    swipeToPop()
}

func swipeToPop() {

    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true;
    self.navigationController?.interactivePopGestureRecognizer?.delegate = nil;
} }

---

我不需要为它添加gestureRecognizer 函数。我在 viewDidLoad 中添加以下代码块就足够了：

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.interactivePopGestureRecognizer?.delegate = nil
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
}

---

在 Swift 中，您可以执行以下代码

import UIKit
extension UINavigationController: UIGestureRecognizerDelegate {

    open override func viewDidLoad() {
        super.viewDidLoad()
        interactivePopGestureRecognizer?.delegate = self
    }

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return viewControllers.count > 1
    }
}

上面的代码有助于快速返回到之前的控制器，如 Facebook、Twitter。

---

斯威夫特 3：

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return (otherGestureRecognizer is UIScreenEdgePanGestureRecognizer)
}

---

如果您希望在您的应用中随处可见这种行为并且不想向单个 viewDidAppear 等添加任何内容，那么您应该创建一个子类

class QFNavigationController:UINavigationController, UIGestureRecognizerDelegate, UINavigationControllerDelegate{
    override func viewDidLoad() {
        super.viewDidLoad()
        interactivePopGestureRecognizer?.delegate = self
        delegate = self
    }

    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        super.pushViewController(viewController, animated: animated)
        interactivePopGestureRecognizer?.isEnabled = false
    }

    func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
        interactivePopGestureRecognizer?.isEnabled = true
    }

    // IMPORTANT: without this if you attempt swipe on
    // first view controller you may be unable to push the next one
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return viewControllers.count > 1
    }

}

现在，无论您何时使用 QFNavigationController，您都可以获得所需的体验。

---

设置自定义后退按钮会禁用向后滑动功能。

保留它的最佳方法是继承 UINavigationViewController 并将自己设置为 interactivePopGestureRecognizer 委托；然后您可以从 gestureRecognizerShouldBegin 返回 YES 以允许向后滑动。

例如，这是在 AHKNavigationController

还有一个 Swift 版本：https://stackoverflow.com/a/43433530/308315

---

This 答案，但有情节提要支持。

class SwipeNavigationController: UINavigationController {

    // MARK: - Lifecycle

    override init(rootViewController: UIViewController) {
        super.init(rootViewController: rootViewController)
    }

    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)

        self.setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

        self.setup()
    }

    private func setup() {
        delegate = self
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        // This needs to be in here, not in init
        interactivePopGestureRecognizer?.delegate = self
    }

    deinit {
        delegate = nil
        interactivePopGestureRecognizer?.delegate = nil
    }

    // MARK: - Overrides

    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        duringPushAnimation = true

        super.pushViewController(viewController, animated: animated)
    }

    // MARK: - Private Properties

    fileprivate var duringPushAnimation = false
}

---

我创建了以下 Swift 5+ UIViewController 扩展程序，以便更轻松地在您需要的每个屏幕上添加/删除交互式弹出手势。

笔记：

在每个具有自定义后退按钮的屏幕上添加 enableInteractivePopGesture()

在 viewDidAppear 上为导航控制器的根屏幕添加 disableInteractivePopGesture() 以防止向后滑动问题这里提到的一些答案

还要在您不希望有后退按钮的推送屏幕上添加 disableInteractivePopGesture() 并向后滑动手势扩展 UIViewController：UIGestureRecognizerDelegate { func disableInteractivePopGesture() { navigationItem.hidesBackButton = true navigationController?.interactivePopGestureRecognizer?.delegate = self navigationController?。 interactivePopGestureRecognizer?.isEnabled = false } func enableInteractivePopGesture() { navigationController?.interactivePopGestureRecognizer?.delegate = self navigationController?.interactivePopGestureRecognizer?.isEnabled = true } }

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我们都在解决 some old bugs 可能因为它是“设计”而无法修复的问题。我在尝试取消 interactivePopGestureRecognizer 的委托时遇到了@iwasrobbed 在其他地方描述的冻结问题，这似乎应该有效。如果您希望滑动行为重新考虑使用您可以自定义的 backBarButtonItem。

当 UINavigationBar 隐藏时，我还遇到了 interactivePopGestureRecognizer 不工作。如果隐藏导航栏对您来说是一个问题，请在实施错误的解决方法之前重新考虑您的设计。

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大多数答案都与代码相关。但我会给你一个在 Storyboard 上工作的。是的！你没看错。

单击主 UINavigationController 并导航到它的 Identity Inspector 选项卡。

在用户定义的运行时属性下，将名为 interactivePopGestureRecognizer.enabled 的单个运行时属性设置为 true。或者以图形方式，您必须启用复选框，如下图所示。

而已。你可以走了。你的后背姿势会像它一直在那里一样工作。

https://i.stack.imgur.com/HrDuA.jpg

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Swift 5，在 viewDidLoad 方法中只添加这两个：

override func viewDidLoad() {
    super.viewDidLoad()

    navigationController?.interactivePopGestureRecognizer?.delegate = self
    navigationController?.interactivePopGestureRecognizer?.isEnabled = true
}

---

我在启用和禁用与弹出视图控制器的滑动交互时遇到问题。

我有一个基本导航控制器，我的应用程序流程就像推送 Splash VC，推送 Main VC，然后推送 Some VC。

我想从 Some VC 返回到 Main VC。还要禁用滑动以防止从主 VC 返回到飞溅。

经过下面的一些尝试对我有用。

在 Main VC 中编写扩展以禁用滑动

extension MainViewController : UIGestureRecognizerDelegate{
    
    func disableSwipeToPop() {
        self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
        self.navigationController?.interactivePopGestureRecognizer?.delegate = self
    }
    
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        
        if gestureRecognizer == self.navigationController?.interactivePopGestureRecognizer {
            return false
        }
        return true
    }
}

在 Main VC 的 viewDidAppear 上调用 disableSwipeToPop() 方法

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.disableSwipeToPop()
}

在 Some VC 中编写扩展以启用滑动弹出 Some VC

extension SomeViewController{
    
    func enableSwipeToPop() {
        self.navigationController?.interactivePopGestureRecognizer?.isEnabled = true
        self.navigationController?.interactivePopGestureRecognizer?.delegate = nil
    }
    
}

在某些 VC 的 viewDidLoad 上调用 enableSwipeToPop() 方法

override func viewDidLoad() {
        super.viewDidLoad()
        self.enableSwipeToPop()
}

而已。此外，如果您尝试在 viewWillAppear 上禁用滑动，当用户停止滑动以取消操作时，您可能会失去再次滑动的能力。

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对于那些仍然遇到问题的人，请尝试将两行分开如下。

override func viewDidLoad() {
    self.navigationController!.interactivePopGestureRecognizer!.delegate = self
    ...

override func viewWillAppear(_ animated: Bool) {
    self.navigationController!.interactivePopGestureRecognizer!.isEnabled = true
    ...

显然，在我的应用程序中，

interactivePopGestureRecognizer!.isEnabled

由于某种原因，在视图显示之前重置为 false。

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