使用自定义函数创建一个UI组

// xxx.ets
class ABuilderParam {
  paramA1: string = '';
}

@Builder
function ABuilder($$: ABuilderParam) {
  Row() {
    Text(`UseStateVarByReference: ${$$.paramA1} `)
  }
}

@Entry
@Component
struct Parent {
  @State label: string = 'Hello';

  build() {
    Column({ space: 20 }) {
      Text(`Parent`)
在Parent组件中调用ABuilder的时候，将this.label引用传递给ABuilder
      ABuilder({ paramA1: this.label })
      Button('Click me').onClick(() => {
点击“Click me”后，UI从“Hello”刷新为“ArkUI”
        this.label = 'ArkUI';
      })
    }
    .width('100%')
    .alignItems(HorizontalAlign.Center)
  }
}