[flutter]监听系统主题改变

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项目需要跟随系统主题变化,修改一些自定义组件的样式,但百度一直没找到可以监听系统主题变化的方法,而 MaterialApp 是有一个设置ThemeMode.system,使得app可以跟随系统主题变化而切换使用传入的theme和darkTheme,因此我就去看了看里面的源码,找到了监听系统主题变化的函数绑定方法。

解决

import 'dart:ui' as ui;
    ui.PlatformDispatcher.instance.onPlatformBrightnessChanged = () {
      // 设置跟随系统主题变化
      followingSystem();
    };
ui.PlatformDispatcher.instance.onPlatformBrightnessChanged = null;
if(null == ui.PlatformDispatcher.instance.onPlatformBrightnessChanged) {
    // 当前没有在监听
} else {
    // 有在监听
}
    ui.PlatformDispatcher.instance.onPlatformBrightnessChanged = () {
       fun1();
       fun2();
       fun3();
       fun4();
       ......
    };
if(ui.PlatformDispatcher.instance.platformBrightness == Brightness.dark) {
    // 系统已经转变为夜间模式
    // app跟随修改主题为夜间
} else {
    // 系统已经转变为白天模式
    // app跟随修改主题为白天
}
// 进入app时手动调用一次 followingSystem(), 然后调用 setFollowingSystem() 绑定监听函数

  void followingSystem() {
    if (ui.PlatformDispatcher.instance.platformBrightness == Brightness.dark) {
      // app跟随修改主题为夜间
    } else {
      // app跟随修改主题为白天
    }
  }

  // 设置跟随系统主题变化
  void setFollowingSystem() {
    ui.PlatformDispatcher.instance.onPlatformBrightnessChanged = () {
      followingSystem();
    };
  }
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