#鸿蒙通关秘籍#如何为自定义组件实现自定义布局？

为自定义组件实现自定义布局可以使用onMeasureSize和onPlaceChildren方法。onMeasureSize用于测量子组件的尺寸，onPlaceChildren用于放置子组件。代码示例如下：

@Component
struct CustomLayout {
  @State startSize: number = 100;
  result: SizeResult = { width: 0, height: 0 };

  onMeasureSize(selfLayoutInfo: GeometryInfo, children: Array<Measurable>, constraint: ConstraintSizeOptions) {
    let size = 100;
    children.forEach((child) => {
      let result: MeasureResult = child.measure({ minHeight: size, minWidth: size, maxWidth: size, maxHeight: size });
      size += result.width / 2;
    });
    this.result.width = 100;
    this.result.height = 400;
    return this.result;
  }

  onPlaceChildren(selfLayoutInfo: GeometryInfo, children: Array<Layoutable>, constraint: ConstraintSizeOptions) {
    let startPos = 300;
    children.forEach((child) => {
      let pos = startPos - child.measureResult.height;
      child.layout({ x: pos, y: pos });
    });
  }

  build() {
    // 构建布局
  }
}