每5秒更新小部件

发布于 2025-02-13 02:57:29 字数 678 浏览 0 评论 0原文

我需要用“ N Now N Now Now On It On It”这样的颤音来做小部件，n来自后端，如果可见小部件，我需要每5秒更新一次。

我尝试了几种方法future.delayed和Timer像这样的方法：

            _timer = Timer(
              const Duration(seconds: 5),
              () {
                if (isCounterVisible) {
                  // load data 
                }
              },
            );

  @override
  void dispose() async {
    if (_timer != null) {
      _timer!.cancel();
      _timer = null;
    }
  }

但是面对我离开此屏幕后仍会发送的问题，并且单位测试失败了的原因，即使在将小部件树处置之后，计时器仍在等待中

，我在确定小部件是否可见时也有问题。我使用了库visibility_detector，但似乎它与模态窗口不起作用 - 在显示模态窗口时，侦听器不会触发。

原文

I need to do the widget with Flutter like "N users watch on it now", where N comes from the backend, and I need to update it every 5 seconds if the widget is visible.

I tried a few approaches with Future.delayed and Timer like this ones:

            _timer = Timer(
              const Duration(seconds: 5),
              () {
                if (isCounterVisible) {
                  // load data 
                }
              },
            );

  @override
  void dispose() async {
    if (_timer != null) {
      _timer!.cancel();
      _timer = null;
    }
  }

But facing an issue that requests still sending after I go away from this screen, and unit tests failed for the reason A Timer is still pending even after the widget tree was disposed

Also, I have problems with determining is widget visible or not. I used library visibility_detector but seems it does not work with modal windows - the listener does not trigger when the modal window showed.

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梦罢 2025-02-20 02:57:29

timer.periodic将完成这项工作，您也可以使用可取消的未来。您缺少super.dispose（）;。

Timer? timer;

void initTimer() {
  if (timer != null && timer!.isActive) return;

  timer = Timer.periodic(const Duration(seconds: 5), (timer) {
    //job
    setState(() {});
  });
}

@override
void dispose() {
  timer?.cancel();
  super.dispose();
}

现在，使用inittimer（）启动woker。

Timer.periodic will do the job, Also you can use cancelable future. You are missing super.dispose();.

Timer? timer;

void initTimer() {
  if (timer != null && timer!.isActive) return;

  timer = Timer.periodic(const Duration(seconds: 5), (timer) {
    //job
    setState(() {});
  });
}

@override
void dispose() {
  timer?.cancel();
  super.dispose();
}

Now use initTimer() to start woker.

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