Swipe back and forward on navigationController

问题:

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

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?

回答1:

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

• Add an instance variable (as a strong property) nextViewController to all your view controllers

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

• 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.

To handle the swipe itself:

• Just add a UISwipeGestureRecognizer to each view controller's view.

• 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.