在navigationController上向后和向前滑动 [英] Swipe back and forward on navigationController

问题描述

每个UIViewController，以rootViewController开头，使用[self.navigationController pushViewController nextView]来推送新视图。滑动工作正常。

Each UIViewController, starting with rootViewController uses [self.navigationController pushViewController nextView] to push new views. Swipe works fine.

如何向前滑动实现相同的行为？更确切地说，我在弹出后退或后退按钮后如何保持UIViewController，所以我可以在向前滑动的情况下再次添加它？

How can I implement the same behavior for the swipe forward? I more exactly, how I keep the UIViewController after popped with swipe back or back button, so I can add it again in case of swipe forward?

推荐答案

要跟踪视图控制器，您可以执行以下操作：

To keep track of your view controllers, you could do the following:

• 向所有视图控制器添加一个实例变量（作为强属性） nextViewController

无论何时推送新的视图控制器，将 nextViewController 设置为推送的视图控制器

Whenever you push a new view controller, set nextViewController to the pushed view controller

现在，每当用户向前滑动时，只需按 nextViewController 即可。但是，首先检查 nil 。如果 currentViewController.nextViewController = nil 您知道用户从未导航过这一点，并且您处理得当。您可以忽略向前滑动，或者您可以向用户发送消息。

Now, whenever the user swipes forward, you just push the nextViewController. But, first check for nil. If currentViewController.nextViewController = nil you know that the user has never navigated beyond this point, and you handle appropriately. You could just ignore the swipe forward, or you could send the user a message.

要处理滑动本身：

• 只需将UISwipeGestureRecognizer添加到每个视图控制器的视图。

然后，当您的滑动方法被调用时，请检查手势识别器的方向属性。如果是向前滑动，请按上述方法按 nextViewController 。

Then, when your swipe method is called, check the gesture recognizer's direction property. If it was a forward swipe, push the nextViewController as described above.

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