material-design – 出现屏幕键盘时隐藏FAB

在Flutter中,如何在屏幕键盘出现时隐藏 FAB button？

屏幕键盘显示时,FAB按钮会覆盖其他元素.

解决方法

您可以通过使用 viewInsets检查键盘可见性并基于它隐藏fab来实现它.

例：

import 'package:Flutter/material.dart';

void main() {
  runApp(new MaterialApp(
    title: "Example",home: new FabHideOnKeyboard(),));
}

class FabHideOnKeyboard extends StatefulWidget {
  @override
  _FabHideOnKeyboardState createState() => new _FabHideOnKeyboardState();
}

class _FabHideOnKeyboardState extends State<FabHideOnKeyboard> {
  @override
  Widget build(BuildContext context) {
    final bool showFab = MediaQuery.of(context).viewInsets.bottom==0.0;
    return Scaffold(
      resizetoAvoidBottomPadding: true,body:Container(
        alignment: Alignment.center,child: Column(
          mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[
            Text("TextField:"),TextField()
          ],),floatingActionButton: showFab?Icon(Icons.add):null,);
  }
}

希望有所帮助！