Flutter——全局点击背景收起键盘

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      initialRoute: "/",
      routes: {
        "/": (context) => HomePage(),
      },
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      builder: (BuildContext context, child) => Scaffold(
        body: GestureDetector(
          child: child,
          onTap: () {
            hideKeyboard(context);
          },
        ),
      ),
    );
  }

  void hideKeyboard(BuildContext context) {
    FocusScopeNode currentFocus = FocusScope.of(context);
    if (!currentFocus.hasPrimaryFocus && currentFocus.focusedChild != null) {
      FocusManager.instance.primaryFocus.unfocus();
    }
  }
}