ThreeStage-PanGesture

常规的三段式拖拽手势动画，主要用于部分视图从底部拖拽到屏幕中央，再到屏幕顶部等场景。Conventional three-stage drag gesture animation is mainly used to drag the view from the bottom to the center of the screen, and then to the top of the screen and other scenes.