How to cancel/reset an UIGestureRecognizer

Question

how can I cancel or reset an UIGestureRecognizer? The problem is, that if I set waitForSomething to NO during a gesture, the next event is UIGestureRecognizerStateChanged. But the first event should be UIGestureRecognizerStateBegan.

My Code:

- (void) panned:(UIPanGestureRecognizer *) recognizer {
    if (waitForSomething) {
        // cancel or reset the recognizer!
        // because the next event should be UIGestureRecognizerStateBegan and not UIGestureRecognizerStateChanged
        return;
    }

    switch (recognizer.state) {
        case UIGestureRecognizerStateBegan:
            // important initialisation code
            break;

        case UIGestureRecognizerStateChanged:
            // do something
            break;
    }
}

Thank you for you help!

user_2912282 · Answer

Swift 4:

if waitForSomething {
    recognizer.isEnabled = false
    recognizer.isEnabled = true
    return
}

user_2864316 · Answer

If you need to do this in more than one place:

in Swift

extension UIGestureRecognizer
{
    func cancel() {
        isEnabled = false
        isEnabled = true
    }
}

How to cancel/reset an UIGestureRecognizer

3 Answers