如何在自定义函数中创建一个UI组件

// 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) 
  } 
}