Question

我创建了一个适合列的屏幕，但由于键盘我需要滚动。

当您插入SingleChildScrollView或ListView属性MainAxisAlignment.spaceBetween时，它将不再有效。

有没有解决方案？

没有SingleChildScrollView屏幕的Gif不会滚动而FloatingActionButton位于屏幕底部

屏幕显示为SingleChildScrollView的Gif，而FloatingActionButton不在屏幕下方

import 'package:flutter/material.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(      
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(backgroundColor: new Color(0xFF26C6DA)),        
      body: new SingleChildScrollView(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              new Container(
                child: new Column(
                  children: <Widget>[
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                      ),
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                    ),
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                    ),
                  ],
                )
              ),
              new Container(
                margin: new EdgeInsets.only(bottom: 16.0),
                child: new FloatingActionButton(
                  backgroundColor: new Color(0xFFE57373),
                  child: new Icon(Icons.check),
                  onPressed: (){}
                ),                    
              )
            ],
        ),
      )            
    );
  }
}

Answer 1

我建议不要像你在这里一样使用FloatingActionButton。 FloatingActionButton应该用于始终需要始终在屏幕上的操作。有关可以滚动的其他按钮类型的建议，请参阅Material guidelines on button usage，例如RaisedButton和FlatButton。你可以在这里使用RaisedButton，但我认为最好让你的屏幕成为一个对话框，并将保存操作放在AppBar中作为我suggested的另一个问题。

如果您决定使用RaisedButton或FlatButton，请记住，滚动条通常不会根据容器的大小更改其项目间距。您可以在MainAxisAlignment.spaceBetween周围放置一些Padding，而不是使用RaisedButton元素，而不是TextField元素。无论旋转，屏幕尺寸如何，无论键盘是否已启动，这都将确保它们间隔相同的距离。

Answer 2

按照以下代码注册。

MainAxisAlignment.spaceBetween已替换为动态填充，具体取决于屏幕尺寸。

import 'package:flutter/material.dart';
import 'dart:ui' as ui;

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(      
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final ui.Size logicalSize = MediaQuery.of(context).size;
    final double _height = logicalSize.height;
    return new Scaffold(
      appBar: new AppBar(backgroundColor: new Color(0xFF26C6DA)),        
      body: new SingleChildScrollView(
        child: new Column(
          //mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              new Container(
                height: 300.0,
                child: new Column(
                  children: <Widget>[
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                    ),
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                    ),
                    new TextField(
                      decoration: const InputDecoration(
                        labelText: "Description",
                      ),
                      style: Theme.of(context).textTheme.title,
                    ),
                  ],
                )
              ),
              new Container(
                padding: new EdgeInsets.only(top: (_height - 450.0)),
                margin: new EdgeInsets.only(bottom: 16.0),
                child: new FloatingActionButton(
                  backgroundColor: new Color(0xFFE57373),
                  child: new Icon(Icons.check),
                  onPressed: (){}
                ),
              )
            ],
        ),
      )
    );
  }
}

Flutter - SingleChildScrollView干扰列

2 个答案: