使用SwipeGesture如何实现手指离开屏幕惯性滑动效果

参考：

@Entry
@Component
struct PanGestureExample {
  @State offsetX: number = 0
  @State offsetY: number = 0
  @State positionX: number = 0
  @State positionY: number = 0
  private panOption: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Up | PanDirection.Down })

  build() {
    Column() {
      Text('PanGesture offset:\nX: ' + this.offsetX + '\n' + 'Y: ' + this.offsetY)
    }
    .height(300)
    .width(300)
    .padding(20)
    .border({ width: 3 })
    .margin(50)
    .translate({ x: this.offsetX, y: this.offsetY, z: 0 }) // 以组件左上角为坐标原点进行移动
    // 上下拖动触发该手势事件
    .gesture(
      PanGesture(this.panOption)
        .onActionStart((event?: GestureEvent) => {
          console.info('Pan start')
        })
        .onActionUpdate((event?: GestureEvent) => {
          if (event) {
            // this.offsetX = this.positionX + event.offsetX
            // this.offsetY = this.positionY + event.offsetY
            console.log('yeyouzhi offsetY>>>'+event.offsetY)
            animateTo({
              duration: 2000,
              curve: Curve.EaseOut,
              iterations: 1 ,
              playMode: PlayMode.Normal,
              onFinish: () => {
                console.info('play end')
              }
            }, () => {

              this.offsetX = this.positionX + event.offsetX
              this.offsetY = this.positionY + event.offsetY
            })
          }
        })
        .onActionEnd(() => {
          this.positionX = this.offsetX
          this.positionY = this.offsetY
          console.info('Pan end')
        })
    )
  }
}