objective-c - UIGestureRecognizer State Changed 和 touchesMoved 之间有什么区别？

Question

我正在研究在 LongPressGesture 之后拖动 UIView。一些代码使用 touchesMoved:，一些代码检查 UIGestureRecognizerStateChange .还是不明白，哪个更好？

Answer 1

来自manual :

When a gesture recognizer recognizes a discrete gesture, it sets the state property to UIGestureRecognizerStateRecognized. If the gesture is continuous, it sets the state property first to UIGestureRecognizerStateBegan; then, for each change in position of the gesture, it sets (or resets) the property to UIGestureRecognizerStateChanged. When the gesture ends, it sets state to UIGestureRecognizerStateEnded. If at any point a gesture recognizer realizes that this multitouch sequence is not its gesture, it sets its state to UIGestureRecognizerStateFailed.

因此，如果用户触摸屏幕总是会生成一个 touchedMoved 事件，并且如果它处于连续手势的中间，它也会导致设置 UIGestureRecognizerStateChanged 状态。