#鸿蒙通关秘籍#如何使用三指捏合手势调整组件缩放？

通过PinchGesture可以检测捏合手势，从而调整组件的缩放比例。具体实现如代码所示：

@Entry
@Component
struct Index {
  @State scaleValue: number = 1;
  @State pinchValue: number = 1;
  @State pinchX: number = 0;
  @State pinchY: number = 0;

  build() {
    Column() {
      Column() {
        Text('PinchGesture scale:\n' + this.scaleValue)
        Text('PinchGesture center:\n(' + this.pinchX + ',' + this.pinchY + ')')
      }
      .height(200)
      .width(300)
      .border({ width: 3 })
      .margin({ top: 100 })
      .scale({ x: this.scaleValue, y: this.scaleValue, z: 1 })
      .gesture(
        PinchGesture({ fingers: 3 })
          .onActionStart((event: GestureEvent|undefined) => {
            console.info('Pinch start');
          })
          .onActionUpdate((event: GestureEvent|undefined) => {
            if(event){
              this.scaleValue = this.pinchValue * event.scale;
              this.pinchX = event.pinchCenterX;
              this.pinchY = event.pinchCenterY;
            }
          })
          .onActionEnd(() => {
            this.pinchValue = this.scaleValue;
            console.info('Pinch end');
          })
      )
    }
  }
}