HarmonyOS 相对布局的高度问题

@Entry  
@Component  
struct Index {  
  @State message: string = 'Hello World';  
  @State person:Person = new Person()  
  @Builder  
  itemView2(item: Person) {  
    RelativeContainer() {  
      Text(item.name)  
        .fontColor(Color.Black)  
        .fontSize(15)  
        .margin({ left: 10, top: 20 })  
        .id('id_name')  
      Text(item.sex)  
        .fontColor(Color.Gray)  
        .fontSize(13)  
        .alignRules({  
          top: { anchor: 'id_name', align: VerticalAlign.Bottom },  
        })  
        .margin({ left: 10, top: 5 })  
        .id('id_sex')  
      Text(item.phone)  
        .fontColor(Color.Red)  
        .fontSize(12)  
        .alignRules({  
          top: { anchor: 'id_name', align: VerticalAlign.Bottom },  
          left: { anchor: 'id_sex', align: HorizontalAlign.End }  
        })  
        .margin({ left: 5, top: 5 })  
        .id('id_phone')  
      Image($r('app.media.startIcon'))  
        .width(40)  
        .height(40)  
        .objectFit(ImageFit.Cover)  
        .alignRules({  
          left: { anchor: 'id_phone', align: HorizontalAlign.End },  
          center: { anchor: 'id_phone', align: VerticalAlign.Center },  
        })  
        .id('id_avatar')  
    }  
    .width("auto")  
    .height("auto")  
    .borderColor(Color.Pink)  
    .borderWidth(5)  
  }  
  build() {  
    Column() {  
    this.itemView2(this.person)  
    }  
    .justifyContent(FlexAlign.Center)  
    .height('100%')  
    .width('100%')  
  }  
}  
class Person {  
  name: string = "John"  
  sex: string = "男"  
  phone: string = "8208208820"  
  age: number = 18  
}