[Flutter combat] Globally click on the blank space to hide the keyboard

Lao Meng's Guide: Why do you want to hide the keyboard by clicking the blank space ? Because this is the default behavior of the iOS platform, the Android platform has a button to close the keyboard by default in the upper right corner of the pop-up keyboard, so clicking the blank space will not hide the keyboard.

For a single page, by adding focusNode to the TextField, the TextField loses the focus when clicking on the blank space, the implementation is as follows:

class DismissKeyboardDemo extends StatelessWidget {
  final FocusNode focusNode = FocusNode();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: GestureDetector(
        onTap: () {
          focusNode.unfocus();
        },
        child: Container(
          color: Colors.transparent,
          alignment: Alignment.center,
          child: TextField(
            focusNode: focusNode,
          ),
        ),
      ),
    );
  }
}

When there are multiple TextFields on multiple pages in the App, this method will increase a lot of repetitive code, so globally add a listener that clicks on the blank space:

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      builder: (context, child) => Scaffold(
        body: GestureDetector(
          onTap: () {
            FocusScopeNode currentFocus = FocusScope.of(context);
            if (!currentFocus.hasPrimaryFocus &&
                currentFocus.focusedChild != null) {
              FocusManager.instance.primaryFocus.unfocus();
            }
          },
          child: child,
        ),
      ),
      home: DismissKeyboardDemo(),
    );
  }
}

You can also hide the keyboard as follows:

SystemChannels.textInput.invokeMethod('TextInput.hide');

Modify the DismissKeyboardDemo page:

class DismissKeyboardDemo extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(
        child: TextField(),
      ),
    );
  }
}

The effect is the same as above, and the keyboard can also be hidden by clicking the blank space.

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