鸿蒙UI数据绑定不适用prop注解方式以及指定获取某个View

import HashMap from '@ohos.util.HashMap'; 
 
import EventBus from 'eventbusjs'; 
 
const KEY_: string = 'ChildComponent2'; 
const MSG_CLICK = 'msg_onclick'; 
 
@Entry 
@Component 
@Preview 
struct ParenComponent { 
  @State clickPropCount: number = 0; 
  private callbackController: DemoController = new DemoController(); 
 
  build() { 
    Row() { 
      Column() { 
        Button('方式一：通过Prop交互') 
          .width('100%').height('45vp').onClick(event => { 
          this.clickPropCount++; 
        }) 
        ChildComponent1({ clickCount: this.clickPropCount, title: '通过Prop传值' }); 
 
        Button('方式二：通过注册回调交互') 
          .width('100%').height('45vp').onClick(event => { 
          this.callbackController.listenerList.forEach((listener, key) => { 
            listener?.onChange(); 
          }) 
        }) 
        ChildComponent2({ controller: this.callbackController, title: '通过注册回调传值' }); 
 
        // https://gitee.com/openharmony-tpc/openharmony_tpc_samples/tree/master/EventBus 
        Button('方式三：通过EvtBus交互') 
          .width('100%').height('45vp').onClick(event => { 
          EventBus.dispatch(MSG_CLICK); 
        }) 
        ChildComponent3({ title: '通过EvtBus传值' }); 
      }.height('100%') 
    }.height('100%') 
  } 
}
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