HarmonyOS 鸿蒙Next 页面中的组件能否感知页面变化

可以参考demo

//Index.ets
import { pageBTmp, Pages } from './pageB'

@Entry
@Component
struct Index {
  @State message: string = 'Hello World'
  @Provide('pageInfo') pageInfo: NavPathStack = new NavPathStack()

  @Builder
  PageMap(name: string) {
    if (name === 'pageB') {
      pageBTmp({ names: name, values: this.pageInfo } as Pages)
    }
  }
  build() {
    Navigation(this.pageInfo) {
      Column() {
        Text(this.message)
          .width('80%')
          .height(50)
          .margin(10)

        CustomComp()
      }
    }.title('NavIndex').navDestination(this.PageMap)
  }
}

class ParamWithOp {
  operation: number = 1
  count: number = 10
}

// A页面中的自定义组件
@Component
struct CustomComp {
  @Consume pageInfo: NavPathStack
  @State routerParams: ParamWithOp | undefined = undefined

  build() {
    Column() {
      Button('pushPath', { stateEffect: true, type: ButtonType.Capsule })
        .width('80%')
        .height(40)
        .margin(10)
        .onClick(() => {
          this.pageInfo.pushPath({name: 'pageB', param: new ParamWithOp(), onPop: (popInfo: PopInfo)=>{
            // 在自定义组件中获取到返回的参数
            this.routerParams = popInfo.result as ParamWithOp
          }});
        })

      Text('返回的数据: ')
      Text(JSON.stringify(this.routerParams))
    }
  }
}

//pageB.ets
export class Pages {
  names: string = ""
  values: NavPathStack | null = null
}

class ParamWithOp {
  operation: number = 1
  count: number = 10
  constructor(count: number) {
    this.count = count;
  }
}

@Builder
export function pageBTmp(info: Pages) {
  NavDestination() {
    Column() {
      Button('pop', { stateEffect: true, type: ButtonType.Capsule })
        .width('80%')
        .height(40)
        .margin(20)
        .onClick(() => {
          // 回退到上一个页面，将处理结果传入push的onPop回调中。
          (info.values as NavPathStack).pop(new ParamWithOp(111));
        })


    }.width('100%').height('100%')
  }.title('pageB')
  .onBackPressed(() => {
    // 回退到上一个页面，将处理结果传入push的onPop回调。
    (info.values as NavPathStack).pop(new ParamWithOp(0));
    return true;
  })
}