HarmonyOS 传入控制器给组件的某个属性, 通过这个控制器获取组件的属性

示例参考：

@Entry
@Component
struct Index {
  controller: CustomController = new CustomController()

  build() {
    Column() {
      CustomWidget({ controller: this.controller })
        .width("100%")
        .height("100%")
        .onClick(() => {
          this.controller.numberAdd();
        })
    }.width("100%").height("100%")
  }
}

@Component
struct CustomWidget {
  controller: CustomController = new CustomController();
  @State index: number = 0
  numberAdd = () => {
    this.index++;
  };

  aboutToAppear(): void {
    this.controller.numberAdd = this.numberAdd;
  }

  build() {
    Text("current number is" + this.index.toString())
  }
}

//自定义controller
class CustomController {
  numberAdd = () => {
  };
}