如何在设置 leftBarButtonItem 后在 UINavigationController 中启用 back/left 滑动手势？

Question

我从 here 得到了相反的问题。在 iOS7 中默认，UINavigationController 堆栈的向后滑动手势可以弹出呈现的 ViewController。现在我只是为所有 ViewControllers.

统一了所有 self.navigationItem.leftBarButtonItem 样式

代码如下：

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:LOADIMAGE(@"back_button") style:UIBarButtonItemStylePlain target:self action:@selector(popCurrentViewController)];

之后，navigationController.interactivePopGestureRecognizer 被禁用。如何在不删除自定义 leftBarButtonItem 的情况下启用弹出手势？

谢谢！

Answer 1

首先在 viewDidLoad 中设置委托：

self.navigationController.interactivePopGestureRecognizer.delegate = self;

然后在按下时禁用手势：

- (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。

Answer 2

当我设置委托时它对我有用

self.navigationController.interactivePopGestureRecognizer.delegate = self;

然后实施

Swift

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

Objective-C

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

Answer 3

设置自定义后退按钮禁用滑动返回功能。

保留它的最好办法是继承 UINavigationViewController 并将其自身设置为 interactivePopGestureRecognizer 委托；然后你可以从 gestureRecognizerShouldBegin return YES 允许向后滑动。

例如，这是在AHKNavigationController

中完成的

还有一个 Swift 版本：

Answer 4

对我有用 Swift 3:

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

并在 ViewDidLoad 中：

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

Answer 5

Swift 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)
}

Answer 6

这是在 iOS 10、Swift 3[= 中启用/禁用滑动弹出视图控制器的最佳方式23=]：

对于第一个屏幕[您想禁用滑动手势的地方]：

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[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; } }

Answer 7

您需要处理两种情况：

当您将新视图推入堆栈时
当您显示根视图控制器时

如果你只需要一个基础 class 就可以使用，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 class 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

Answer 8

对于那些仍然有此问题的人，请尝试将两行分开，如下所示。

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

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

显然，在我的应用中，

interactivePopGestureRecognizer!.isEnabled

由于某种原因在显示视图之前被重置为 false。

Answer 9

回答，但有故事板支持。

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
}

Answer 10

我不需要为它添加 gestureRecognizer 函数。我在 viewDidLoad:

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
}

Answer 11

在Swift中可以执行以下代码

import UIKit
extension UINavigationController: UIGestureRecognizerDelegate {

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

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

以上代码有助于 swift 返回到之前的控制器，如 Facebook、Twitter。

Answer 12

如果您希望在您的应用程序中的任何地方都有这种行为，并且不想向个人添加任何东西 viewDidAppear 等，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，无论何时使用 QFNavigationController，您都会获得所需的体验。

Answer 13

我们都在解决 some old bugs 可能尚未修复的问题，因为它是“设计使然”。我运行遇到冻结问题 @iwasrobbed 在尝试使 interactivePopGestureRecognizer 的委托无效时在其他地方描述过，这似乎应该有效。如果您想要使用 backBarButtonItem 重新考虑滑动行为，您可以自定义。

我也运行进入 interactivePopGestureRecognizer 当 UINavigationBar 被隐藏时不工作。如果您担心隐藏导航栏，请在实施错误解决方法之前重新考虑您的设计。

Answer 14

大多数答案都与在代码上进行有关。但我会给你一个在故事板上工作的。是的！你没看错。

单击主 UINavigationController 并导航到它的 Identity Inspector 选项卡。
在 User Defined Runtime Attributes 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。

就是这样。你可以开始了。您的后退手势会一直有效。

Answer 15

Swift 5、viewDidLoad方法中只添加这两个：

override func viewDidLoad() {
    super.viewDidLoad()

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

Answer 16

我在启用和禁用滑动交互以弹出视图控制器时遇到问题。

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 那样。

我想滑动以从 Some VC 返回到 Main VC。同时禁用滑动以防止从主 VC.

返回飞溅

经过以下尝试后对我有用。

在 Main VC 中写一个扩展来禁用滑动

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 的 viewDidAppear 上调用 disableSwipeToPop() 方法 VC

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

在 Some VC 中写一个扩展，使滑动弹出 Some VC

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

在某些 VC

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

就是这样。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。

Answer 17

我创建了以下 Swift 5+ UIViewController 扩展程序，以便在您需要的每个屏幕上更轻松地 add/remove 交互式弹出手势。

注：

在每个具有自定义后退按钮的屏幕上添加 enableInteractivePopGesture()
在导航控制器的根屏幕 viewDidAppear 上添加 disableInteractivePopGesture() 以防止向后滑动问题此处提到的一些答案

同时在您不希望有后退按钮和向后滑动手势的推送屏幕上添加 disableInteractivePopGesture()

extension 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
  }
}

如何在设置 leftBarButtonItem 后在 UINavigationController 中启用 back/left 滑动手势？

How to enable back/left swipe gesture in UINavigationController after setting leftBarButtonItem?

objective-c

uinavigationbar

uinavigationcontroller

uinavigationitem

ios