如何取消/重置UIGestureRecognizer

Question

如何取消或重置UIGestureRecognizer？问题是，如果我在手势期间将waitForSomething设置为NO，则下一个事件为UIGestureRecognizerStateChanged。但第一个事件应该是UIGestureRecognizerStateBegan。

我的代码：

- (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;
    }
}

谢谢你的帮助！

Answer 1

我明白了！ ： - ）

也许其他人遇到了这个问题，这是解决方案：

if (waitForSomething) {
    recognizer.enabled = NO;
    recognizer.enabled = YES;
    return;
}

下一个活动将是UIGestureRecognizerStateFailed，然后是UIGestureRecognizerStateBegan。

Answer 2

斯威夫特4：

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

Answer 3

如果您需要在多个地方进行此操作：

在Swift

 扩展UIGestureRecognizer
{
    func cancel（）{
        isEnabled =假
        isEnabled = true
    }
}