HarmonyOS %s、%d这种动态更新文本的方法是如何实现的

可以这样修改string资源：{"name": "str_retry","value": "请在%d秒后重试"},this.countdown这个应该是getStringSync这个方法的参数而不是$r()的参数，您位置放错了；另外每次数值变化都要重新赋值

@Entry
@Component
struct Index {
  // 倒计时
  @State countdown: number = 60;
  // 属性字符串
  mutableStyledString: MutableStyledString = new MutableStyledString(getContext().resourceManager.getStringSync($r('app.string.str_retry'),this.countdown));
  controller: TextController = new TextController();

  async onPageShow() {
    this.controller.setStyledString(this.mutableStyledString)
  }
  // 开始倒计时
  aboutToAppear() {
    setInterval(() => {
      this.countdown--;
      this.mutableStyledString = new MutableStyledString(getContext().resourceManager.getStringSync($r('app.string.str_retry'),this.countdown));
      this.controller.setStyledString(this.mutableStyledString)
    }, 1000)
  }

  build() {
    Column() {
      Text(undefined, { controller: this.controller }).key('mutableStyledString') // 始终显示“请在%d秒后重试”
      // Text($r('app.string.str_retry', this.countdown)) // 显示“请在60秒后重试”且正常倒数
    }
  }
}