简单记录 Flutter 的 一些系统回调函数

使用办法
with WidgetsBindingObserver

class _TestLifeCycleState extends State with WidgetsBindingObserver {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return null;
  }

  /*路由弹出回调*/
  @override
  Future didPopRoute() {
    // TODO: implement didPopRoute
    return super.didPopRoute();
  }

  /*有新的路由push回调*/
  @override
  Future didPushRoute(String route) {
    // TODO: implement didPushRoute
    return super.didPushRoute(route);
  }

  /*当手机维度发生变化的时候 比如手机旋转*/
  @override
  void didChangeMetrics() {
    // TODO: implement didChangeMetrics
    super.didChangeMetrics();
  }

  /*当平台的文本缩放因子发生改变的时候*/
  @override
  void didChangeTextScaleFactor() {
    // TODO: implement didChangeTextScaleFactor
    super.didChangeTextScaleFactor();
  }

  /*当系统本地设置改变的时候回调 比如语言设置*/
  @override
  void didChangeLocales(List locale) {
    // TODO: implement didChangeLocales
    super.didChangeLocales(locale);
  }

  /*生命周期发生变化的时候 比如app退到后台或者切换到前台*/
  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    // TODO: implement didChangeAppLifecycleState
    super.didChangeAppLifecycleState(state);
  }

  /*当系统内存很低的情况下回调*/
  @override
  void didHaveMemoryPressure() {
    // TODO: implement didHaveMemoryPressure
    super.didHaveMemoryPressure();
  }

  /*暂时没看懂啥意思*/
  @override
  void didChangeAccessibilityFeatures() {
    // TODO: implement didChangeAccessibilityFeatures
    super.didChangeAccessibilityFeatures();
  }

}