@Builder函数传值问题咨询？

Question

@Builder函数传值问题咨询，以下场景，无法渲染出全部组件。有注意事项吗

咨询场景描述：

interface Pos {
  x: number;
  y: number;
}

@Builder function overBuilder($$: Pos) {
  Row() {
    Column() {
      Text(改变位置).position({x:$$.x, y:$$.y})
      HelloComponent({positionXNum: $$.x, positionYNum: $$.y})
    }
  }
}

@Component
struct HelloComponent {
  @Link positionXNum: number;
  @Link positionYNum: number;

  build() {
    Row() {
      Text(当前X= + this.positionXNum)
      Text(当前Y= + this.positionYNum)
    }
  }
}

@Entry
@Component
struct Parent {
  // @State pos: Pos = new Pos();
  @State pos: Pos = { x: 0, y: 0 };
  @State posX: number = 0;
  @State posY: number = 0;

  build() {
    Column() {
      // Pass the this.label reference to the overBuilder component when the overBuilder component is called in the Parent component.
      // overBuilder({pos: this.pos})
      overBuilder(this.pos)
      Button(‘Click me’).onClick(() => {
        // After Click me is clicked, the UI text changes from Hello to ArkUI.
        this.posX = this.posX+100;
        this.posY = this.posY+100;
      })
    }
  }
}

Answer 1

可以参考如下demo:

interface Pos {
  x: number;
  y: number;
}

@Builder function overBuilder($$: Pos) {
  Row() {
    Column() {
      Text(改变位置).position({x:$$.x, y:$$.y})
      HelloComponent({positionXNum: $$.x, positionYNum: $$.y})
    }
  }
}

@Component
struct HelloComponent {
  @Link positionXNum: number;
  @Link positionYNum: number;

  build() {
    Row() {
      Text(当前X= + this.positionXNum)
      Text(当前Y= + this.positionYNum)
    }
  }
}

@Entry
@Component
struct Parent {
  // @State pos: Pos = new Pos();
  @State pos: Pos = { x: 0, y: 0 };
  @State posX: number = 0;
  @State posY: number = 0;

  build() {
    Column() {
      // Pass the this.label reference to the overBuilder component when the overBuilder component is called in the Parent component.
      // overBuilder({pos: this.pos})
      overBuilder({x:this.posX,y:this.posY })
      Button(‘Click me’).onClick(() => {
        // After Click me is clicked, the UI text changes from Hello to ArkUI.
        this.posX = this.posX+100;
        this.posY = this.posY+100;
      })
    }
  }
}