#鸿蒙通关秘籍#如何在开发HarmonyOS Next水波纹动画特效时有效管理组件状态？

@Entry
@Component
struct Demo {
  @State scaleList: number[] = []  // 缩放比例的数据存储
  @State opacityList: number[] = [] // 存放透明度的数据
  private cloneScaleList: number[] = [] // 克隆初始缩放比例的数据以便复用
  private cloneOpacityList: number[] = [] // 克隆初始透明度的数据，以便重置
  private scaleRatio:number=0.7 // 定义缩放比例增量

  aboutToAppear(): void {
    this.scaleList = new Array(3).fill('').map((item: string, index: number) => 1 + index * this.scaleRatio)
    this.opacityList = new Array(3).fill('').map((item: string, index: number) => (3 - index)/10 )
    this.cloneScaleList = this.scaleList.slice() // 克隆初始缩放比例
    this.cloneOpacityList = this.opacityList.slice() // 克隆初始透明度
  }

  build() {
    Column({ space: 50 }) {
      Stack() {
        ForEach(this.scaleList, (item: number, index: number) => {
          Column() {
          }
          .width(50)
          .height(50)
          .borderRadius(25)
          .backgroundColor('#1463F4')
          .opacity(this.opacityList[index])
          .scale({ x: this.scaleList[index], y: this.scaleList[index] })
          .onAppear(() => {
            animateTo({ duration: 1200, iterations: -1 }, () => {
              this.scaleList[index] = this.cloneScaleList[index] + this.scaleRatio
              this.opacityList[index] = this.cloneOpacityList[index] -  0.1
            })
          })
        }, (item: number, index: number) => index.toString())

        Image($r('app.media.app_icon')).width(50).borderRadius(25)
      }
    }.height('100%').width('100%').justifyContent(FlexAlign.Center).alignItems(HorizontalAlign.Center)
  }
}
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.