如何使按钮宽度与父级匹配？

Question

new Container(
  width: 200.0,
  padding: const EdgeInsets.only(top: 16.0),
  child: new RaisedButton(
    child: new Text(
      "Submit",
      style: new TextStyle(
        color: Colors.white,
      )
    ),
    colorBrightness: Brightness.dark,
    onPressed: () {
      _loginAttempt(context);
    },
    color: Colors.blue,
  ),
),

Answer 1

更新：

在Flutter 2.0中，raisedButton被弃用，并被elevatedButton所取代。您可以使用minimumsize，如下所示：

ElevatedButton(
        style: ElevatedButton.styleFrom(
          minimumSize: Size(double.infinity, 30), // double.infinity is the width and 30 is the height
        ),
        onPressed: () {},
        child: Text('Text Of Button'),
      )

颤振小于2.0的旧答案：

SizedBox.expand(
  child: RaisedButton(...),
)

SizedBox(
  width: double.infinity,
  // height: double.infinity,
  child: RaisedButton(...),
)

ConstrainedBox(
    constraints: const BoxConstraints(minWidth: double.infinity),
    child: RaisedButton(...),
)