Question

我从here得到了相反的问题。默认情况下，在iOS7中，UINavigationController堆栈的后滑动手势可能会弹出显示的ViewController。现在我只对所有self.navigationItem.leftBarButtonItem的所有ViewControllers样式进行了统一。

以下是代码：

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;

另外，将UINavigationControllerDelegate添加到视图控制器。

Answer 2

当我设置代理

时，它适用于我

self.navigationController.interactivePopGestureRecognizer.delegate = self;

然后实施

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

Answer 3

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

如果您只需要一个可以使用的基类，这里是一个Swift 3版本：

import UIKit

final 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)

        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班级中担任UINavigationControllerDelegate，则可以编写代理转发器similar to this answer。

改编自Objective-C中的来源：https://github.com/fastred/AHKNavigationController

Answer 4

它适用于我 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

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
} }

适用于中间屏幕[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;
} }

Answer 6

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
    }
}

以上代码可帮助您快速向左返回到Facebook，Twitter等以前的控制器。

Answer 7

设置自定义后退按钮可禁用滑动后退功能。

保持它的最好方法是继承UINavigationViewController并将自己设置为interactivePopGestureRecognizer委托;然后你可以从gestureRecognizerShouldBegin返回YES以允许滑动。

例如，这是在AHKNavigationController

中完成的

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

Answer 8

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)
}

Answer 9

如果您希望在应用程序中的任何位置都具有这种行为，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，每当您使用QFNavigationController时，您都会获得理想的体验。

Answer 10

This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 11

我不需要为其添加gestureRecognizer函数。对于我来说，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
}

Answer 12

我们正在努力解决some old bugs，因为它是“有意设计的”，因此尚未得到解决。在尝试取消interactivePopGestureRecognizer的委托时，我遇到了其他地方提到的冻结问题@iwasrobbed，这似乎应该可行。如果您想重新使用backBarButtonItem，您可以可以自定义滑动行为。

当interactivePopGestureRecognizer隐藏时，我也遇到UINavigationBar无法正常工作的情况。如果您担心隐藏导航栏，请在实现错误的解决方法之前重新考虑您的设计。

Answer 13

大多数答案都与在代码上执行有关。但我给你一个可以在Storyboard上运行的软件。是!您没看错。

单击主UINavigationController并导航至其Identity Inspector标签。
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，您必须启用下图所示的复选框。

就是这样。你很好您的后向手势将一直有效。

Image displaying the property that out to be set

Answer 14

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
}

Answer 15

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。

我有一个基本的导航控制器，我的应用流程就像推送 Splash VC、推送 Main VC，然后推送 Some VC 一样。

我想滑动以从 Some VC 返回到 Main VC。还要禁用滑动以防止从主 VC 返回飞溅。

经过下面的一些尝试对我有用。

在主 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
    }
}

在主 VC 的 viewDidAppear 上调用 disableSwipeToPop() 方法

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

在 Some VC 中编写一个扩展以启用滑动以弹出 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()
}

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 16

对于仍然遇到此问题的人，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已重置为false。

如何在设置leftBarButtonItem后在UINavigationController中启用后退/左侧滑动手势？

16 个答案: