dart - Flutter CupertinoButton颜色始终为灰色

Question

您好，我有以下 Dart 代码，我希望CupertinoButton为橙色，但无论我做什么，都保持灰色。我尝试将其更改为其他颜色，但仍然保持灰色。

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter/cupertino.dart';

void main() => runApp(new MyApp());


class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    SystemChrome.setEnabledSystemUIOverlays([]);

    return  new MediaQuery(
    data: new MediaQueryData(),
    child: new Container(
      decoration: new BoxDecoration(color: Colors.blue),
      child: new Directionality(
        textDirection: TextDirection.ltr,
        child: new Scaffold(
        body: new Column(
          children: <Widget>[
            new Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                new CupertinoButton (
                  color: Colors.orange,
                  borderRadius: new BorderRadius.circular(30.0),
                  child:
                  new Text("Get Started",
                    textAlign: TextAlign.center,
                    style: new TextStyle(color: Colors.white),
                  ),
                )
              ],
            ),
          ],
        )
      )
    )
  )
);
  }
}

Answer 1

根据documentation。如果您不提供onPressed回调功能，则该按钮将被禁用。

要启用它，您可以传递一个空函数，如下所示。

new CupertinoButton (
              onPressed: ()=>{},
              color: Colors.orange,
              borderRadius: new BorderRadius.circular(30.0),
              child:
              new Text("Get Started",
                textAlign: TextAlign.center,
                style: new TextStyle(color: Colors.white),
              ),
            )