鸿蒙控制某个变量渐变从而实现动画效果的写法

@Component
export struct ResultDisplay {
  @State fontSize: number = 14;
  
  /// build 略同...
  
  startAnimation(): void {
    let param: AnimateParam = { curve: Curve.EaseIn, duration: 500 };
    this.getUIContext()?.animateTo(param, () => this.onEvent());
  }

  onEvent(): void {
    this.fontSize = 42;
  }
}

this.getUIContext()?.animateTo() 会让fontSize 在 500s 内由14到42变化。