UINavigationController自定义动画阻止滑动后退功能 [英] UINavigationController custom animation prevents swipe-to-go-back from working

问题描述

我注意到一些奇怪的事情，可能是UINavigationController中的错误.当您覆盖 -navigationController:animationControllerForOperation:fromViewController:toViewController:

I noticed something strange and may possibly be a bug in UINavigationController. When you override -navigationController:animationControllerForOperation:fromViewController:toViewController:

并返回nil(用于默认动画行为)，则后退拖动手势将不再起作用.此方法的文档说，您应该返回"nil，如果要使用标准导航控制器转换".我的理解是，返回nil不应阻止默认行为的发生.

and return nil (for the default animation behavior), the drag-to-go-back gesture no longer works. The documentation for this method says you should return " nil if you want to use the standard navigation controller transitions". My reading of this is that returning nil should not prevent the default behavior from happening.

我还发现，如果导航控制器的InteractivePopGestureRecognizer.delegate带有对gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:返回YES的内容 弹出手势再次起作用.但是，由于我们要踩踏已安装的默认委托_UINavigationInteractiveTransition，因此此解决方法存在风险.

I also found that if the navigation controllers's interactivePopGestureRecognizer.delegate with something that returns YES for gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: The pop gesture works again. However, this workaround is risky since we are stomping on the default delegate that is installed, which is a _UINavigationInteractiveTransition.

在保留默认的拖后移动手势的同时，是否有办法可以覆盖animationController方法?

Is there someway I can override the animationController method while retaining the default drag-to-go-back gesture?

此问题是相关的.

推荐答案

如果您将UINavigationController子类化，则最简单的修复方法如下(iOS 9.3，Swift 2.2):

If you've subclassed UINavigationController, the simplest fix is as follows (iOS 9.3, Swift 2.2):

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

或者，在UIViewController的任何其他实例中:

Alternatively, in any other instance of UIViewController:

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

实施委托方法navigationController(_:animationControllerFor:from:to:)会禁用导航控制器的交互式弹出手势识别器，但是将手势的委托设置为nil会重新启用它.

Implementing the delegate method navigationController(_:animationControllerFor:from:to:) disables the navigation controller's interactive pop gesture recognizer, but setting the gesture's delegate to nil re-enables it.

如果仅希望在特定情况下启用手势，请参见此答案.

If you only want the gesture to be enabled in particular circumstances, see this answer.

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