App
WidgetsBindingObserver
abstract class WidgetsBindingObserver {
//页面pop
Future<bool> didPopRoute() => Future<bool>.value(false);
//页面push
Future<bool> didPushRoute(String route) => Future<bool>.value(false);
//系统窗口相关改变回调,如旋转
void didChangeMetrics() { }
//文本缩放系数变化
void didChangeTextScaleFactor() { }
//系统亮度变化
void didChangePlatformBrightness() { }
//本地化语言变化
void didChangeLocales(List<Locale> locale) { }
//App生命周期变化
void didChangeAppLifecycleState(AppLifecycleState state) { }
//内存警告回调
void didHaveMemoryPressure() { }
//Accessibility相关特性回调
void didChangeAccessibilityFeatures() {}
}生命周期回调

帧绘制回调
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