lu yuan lu yuan - 3 months ago 12
Objective-C Question

Back swipe gesture is not work when I add the leftBarButtonItem

Here is a

ViewControllerA
push a
ViewControllerB
, and in the
ViewControllerB
the
leftBarButtonItem
is set as following:

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(backBtnClicked:)];


After setting the
leftBarButtonItem
, the Back swipe gesture is not work. Is it possible to keep the swipe gesture?

Answer

Because you've changed the left bar button item, you're telling the navigation controller to stop managing the navigation-based back-actions that the user can take.

To fix it, you can tell the navigation controller to continue accepting those gestures on the current view controller by using:

self.navigationController.interactivePopGestureRecognizer.delegate = self;

Where self if your view controller.

UIViewController privately implements UIGestureRecognizerDelegate, so you'll get a warning for this, but you can mitigate this by adding in the protocol conformance (<UIGestureRecognizerDelegate>) to your header, or to a class extension.

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