Question

我正在使用登录屏幕构建一个Flutter应用程序。专注于文本字段，屏幕溢出，并且我无法滚动。我已经尝试过使用ListView.builder，但这只会产生renderBox错误，而常规的ListView无法正常工作

小部件的结构是这样的

-scafold
   - body
     - container
       - column    
           - form
              - column
                  - textInput
                  - textInput
                  - container    
           - container
              - row      
           - raisedButton

提前谢谢！

Answer 1

有两种简单的方法可以做到这一点。

将Column包裹在SingleChildScrollView

中

SingleChildScrollView(
  child: Column(
    children: [
      Text('First'),
      //... other children
      Text('Last'),
    ],
  ),
)

使用ListView代替Column。
```
ListView(
  children: [
    Text('First'),
    //... other children
    Text('Last'),
  ],
)
```
这种方法易于使用，但是会丢失crossAxisAlignment之类的功能以及Column提供的其他好处，在这种情况下，您可以将孩子的小部件包装在Align内并设置对齐方式属性。

现在您可能有嵌套的子级，这些子级可以进一步滚动，在这种情况下，您需要为子级提供固定的高度，就可以使用SizedBox来完成。

例如：

ListView(
  children: [
    Text('First'),
    SizedBox(
      height: 100,
      child: ListView(...), // nested ScrollView
    ),
    Text('Last'),
  ],
)

Answer 2

尝试此代码：使用ListView

    class Home extends StatelessWidget {
  @override
     Widget build(BuildContext context) {
        // TODO: implement build
        return Scaffold(
          body: Center(
            child: ListView(
              shrinkWrap: true,
              padding: EdgeInsets.all(15.0),
              children: <Widget>[
                Center(
                  child: Card(
                    elevation: 8.0,
                    child: Container(
                      padding: EdgeInsets.all(10.0),
                      child: Column(
                        children: <Widget>[
                          TextField(
                            decoration: InputDecoration(
                              prefixIcon: Icon(Icons.person),
                              labelText: "Username or Email",
                            ),
                          ),
                          SizedBox(
                            height: 15.0,
                          ),
                          TextField(
                            decoration: InputDecoration(
                              prefixIcon: Icon(Icons.lock),
                              labelText: "Password",
                            ),
                          ),
                          SizedBox(
                            height: 15.0,
                          ),
                          Material(
                            borderRadius: BorderRadius.circular(30.0),
                            //elevation: 5.0,
                            child: MaterialButton(
                              onPressed: () => {},
                              minWidth: 150.0,
                              height: 50.0,
                              color: Color(0xFF179CDF),
                              child: Text(
                                "LOGIN",
                                style: TextStyle(
                                  fontSize: 16.0,
                                  color: Colors.white,
                                ),
                              ),
                            ),
                          )
                        ],
                      ),
                    ),
                  ),
                ),
                SizedBox(
                  height: 25.0,
                ),
                Row(
                  children: <Widget>[
                    Expanded(child: Text("Don't Have a Account?")),
                    Text("Sign Up",
                        style: TextStyle(
                          color: Colors.blue,
                        )),
                  ],
                ),
              ],
            ),
          ),
          bottomNavigationBar: Padding(
            padding: EdgeInsets.all(10.0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Expanded(
                    child: RaisedButton(
                      padding: EdgeInsets.all(15.0),
                      onPressed: () {},
                      color: Colors.white,
                      shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(
                            32.0,
                          ),
                          side: BorderSide(color: Color(0xFF179CDF))),
                      child: Text(
                        "SKIP SIGN UP FOR NOW",
                        style:
                        TextStyle(fontSize: 18.0, color: Color(0xFF179CDF)),
                      ),
                    )),
              ],
            ),
          ),
        );
      }
    }

Answer 3

将SingleChildScrollView与Columns结合使用可使屏幕滚动，并且可以使布局如上

这是怎么做

class MyHome extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
        backgroundColor: Colors.white,
        body: SafeArea(
          bottom: false,
          child: Container(
            padding: EdgeInsets.only(left: 15, right: 15),
            height: double.infinity,
            width: double.infinity,
            child: SingleChildScrollView(
                padding: EdgeInsets.only(bottom: 15),
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.end,
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    SizedBox(
                      height: 200.0,
                    ),
                    Card(
                      elevation: 8.0,
                      child: Container(
                        padding: EdgeInsets.all(10.0),
                        child: Column(
                          children: <Widget>[
                            TextField(
                              decoration: InputDecoration(
                                prefixIcon: Icon(Icons.person),
                                labelText: "Username or Email",
                              ),
                            ),
                            SizedBox(
                              height: 15.0,
                            ),
                            TextField(
                              decoration: InputDecoration(
                                prefixIcon: Icon(Icons.lock),
                                labelText: "Password",
                              ),
                            ),
                            SizedBox(
                              height: 30.0,
                            ),
                            MaterialButton(
                                height: 50.0,
                                elevation: 5,
                                minWidth: 300,
                                onPressed: () {},
                                shape: RoundedRectangleBorder(
                                  borderRadius: new BorderRadius.circular(30.0),
                                ),
                                color: Theme.of(context).primaryColor,
                                disabledColor: Theme.of(context)
                                    .primaryColor
                                    .withOpacity(0.50),
                                disabledElevation: 0,
                                child: Text('SIGN IN',
                                    textAlign: TextAlign.center, style: TextStyle(color: Colors.white),))
                          ],
                        ),
                      ),
                    ),
                    SizedBox(
                      height: 25.0,
                    ),
                    Row(
                      children: <Widget>[
                        Expanded(child: Text("Don't Have a Account?")),
                        Text("Sign Up",
                            style: TextStyle(
                              color: Colors.blue,
                            )),
                      ],
                    ),
                    SizedBox(
                      height: 50.0,
                    ),
                    Align(
                      alignment: Alignment.bottomCenter,
                      child: Row(mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[
                        Text(
                          'New to App?',
                          style: TextStyle(color: Colors.black87),
                        ),
                        SizedBox(
                          width: 5,
                        ),
                        GestureDetector(
                          onTap: () {
                          },
                          child: Text(
                            "REGISTER", style: TextStyle(
                            color: Colors.blue,
                          )
                          ),
                        ),
                      ]),
                    )
                  ],
                )),
          ),
        ));
  }
}

Answer 4

我们可以使用 Expanded 小部件。它将添加滚动。

return new Expanded(
  child: new SingleChildScrollView(
    child: new Column(
      children: <Widget>[
        _showChild1(),
        _showChild2(),
        ...
        _showChildN()
      ]
    )
  )
);

Answer 5

ListView解决方案应该可以工作，但是在撰写本文时，它遭受了here列出的崩溃的困扰。避免发生崩溃的另一种方法是使用SingleChildScrollView：

return new Container(
  child: new SingleChildScrollView(
    child: new Column(
      children: <Widget>[
        _showChild1(),
        _showChild2(),
        ...
        _showChildN()
      ]
    )
  )
);

Answer 6

在SingleChildScrollView中包装您的列，然后在Center小部件中包装SingleChildScrollView以将小部件在列中居中。

Center(
    child: SingleChildScrollView(
        child: Column(
        children: [
            Text('First'),
            //... other children
            Text('Last'),
        ],
    ),
)

Flutter-如何使列屏幕可滚动

6 个答案: