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我有UIScrollView
且垂直滚动处于活动状态。我想要做的是添加一个方向为.down
的滑动手势,当用户由于到达边缘而无法滚动内容时,手势将被识别。仅在滚动内容到达边缘时识别UIScrollView中的滑动手势
我正在尝试require(toFail :)但它无法正常工作。
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeDown.direction = UISwipeGestureRecognizerDirection.down
swipeDown.require(toFail: self.scrollView.panGestureRecognizer)
self.scrollView.addGestureRecognizer(swipeDown)
我还添加UIGestureRecognizerDelegate
方法同时识别:
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
如何给予优先总是以滚动视图内滚动内容,当它是不可能的了检测刷卡?