HarmonyOS 两个自定义组件之间怎么调用其中一个自定义组件的方法？

现有组件Swiper，以及自定义组件B，类型结构如下：

@Component  
struct B {  
   onAnimationStart?: (index: number, targetIndex: number, event: SwiperAnimationEvent) => void  
  onGestureSwipe?: (index: number, extraInfo: SwiperAnimationEvent) => void  
    build() {  
   }  
   function getCurrentIndicatorInfo(index: number, event: SwiperAnimationEvent) {        
   }  
   function startAnimateTo(duration: number, leftMargin: number, width: number) {  
  }  
}  
build() {  
  Column() {  
     B()  
     Swiper().onAnimationStart((index: number, targetIndex: number, event: SwiperAnimationEvent) => {  
        // 切换动画开始时触发该回调。下划线跟着页面一起滑动，同时宽度渐变。  
        this.currentShelfIndex = targetIndex        
      })  
      .onGestureSwipe((index: number, event: SwiperAnimationEvent) => {  
        // 在页面跟手滑动过程中，逐帧触发该回调。  
      })  
  }  
}

需要达成的目的是监听Swiper的onAnimationStart事件以及onGestureSwipe事件，调用自定义组件B内对应的方法，请问如何实现？

HarmonyOS

FengTianYa

2024-10-16 10:22:55

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回答 1

待解决

回答 1

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put_get

父组件调用子组件的方法可参考一下demo：

@Component  
struct Child {  
  @State private text: string = '初始值'  
  private controller: ChildController = new ChildController();  
  aboutToAppear() {  
    if (this.controller) {  
      this.controller.changeText = this.changeText  
    }  
    console.log('aaa')  
  }  
  private changeText = (value: string) => {  
    this.text = value  
    console.log('bbb')  
  }  
  build() {  
    Column() {  
      Text(this.text)  
    }  
  }  
}  
class ChildController {  
  changeText = (value: string) => {  
    console.log('11111')  
  }  
}  
export let ChildRef = new ChildController()  
@Entry  
@Component  
struct Parent {  
  @State noShow: boolean = false  
  build() {  
    Column() {  
      Text('获取Child的exposeMethods!').fontSize('18vp').fontColor(Color.Gray)  
      Divider()  
      Child({ controller: ChildRef })  
      Child()  
      Button('Parent调用childer的changeText').onClick(() => {  
        ChildRef.changeText('Parent调用childer的changeText')  
      })  
    }  
  }  
}