Flutter 中 Cupertino Picker 的样式

Styling of Cupertino Picker in Flutter

我尝试过使用 flutter 实现这样的布局。

为此我使用了 Cupertino Picker Class。 但它看起来并没有我想要的那么好。

我尝试使用 flutter 网站上列出的属性来修复它,但我没有找到更好的解决方案。我该如何解决这个问题,或者在这种情况下是否还有其他更好的小部件?

我的代码如下所示:

Widget build(BuildContext context) {
return CupertinoPageScaffold(
    navigationBar: CupertinoNavigationBar(
      backgroundColor: Colors.red,
    ),
    child: Container(
      child: Center(
        child: CupertinoPicker(
      itemExtent: 40,
      diameterRatio: 5,
      offAxisFraction: 10,
      backgroundColor: Colors.black54,
      onSelectedItemChanged: (int index) {
        print(index);
      },
      children: <Widget>[
        Text('Tap', style: TextStyle(color:Colors.white)),
        Text('Colorbattle',style: TextStyle(color:Colors.white)),
        Text('Patience',style: TextStyle(color:Colors.white)),
      ],
    ))));

} }

我试过你的代码,尝试实现相同的行为。我观察到更改 diameterRatiooffAxisFraction 的值可能会改变 UI 的样子。在我的示例中,diameterRatiooffAxisFraction 的值分别是 10-1。想象一下这种轮盘赌:

diameterRatio是圆柱体的直径,offAxisFraction是圆柱体侧面所面对的轴。为了模仿图片中的示例,将 offAxisFraction 的值设置为正值,在下面显示的实现中,我将其设置为 10.

下面是复制您要复制的 UI 行为的示例:

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: CupertinoNavigationBar(
        backgroundColor: Colors.red,
      ),
      child: Center(
        child: Container(
          // color: Colors.black54,
          decoration: BoxDecoration(
            border: Border.all(color: Colors.white),
            borderRadius: BorderRadius.all(
              Radius.circular(15),
            ),
          ),
          width: 200.0,
          height: 150.0,
          child: Center(
            child: CupertinoPicker(
              itemExtent: 40,
              diameterRatio: 10,
              offAxisFraction: -1,
              backgroundColor: Colors.black54,
              onSelectedItemChanged: (int index) {
                print(index);
              },
              children: <Widget>[
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.only(right: 40.0),
                    child: Text(
                      'Estimate',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.only(right: 40.0),
                    child: Text(
                      'Random',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.only(right: 40.0),
                    child: Text(
                      'Colorbattle',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.only(right: 40.0),
                    child: Text(
                      'Patience',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
                Align(
                  alignment: Alignment.centerRight,
                  child: Padding(
                    padding: const EdgeInsets.only(right: 40.0),
                    child: Text(
                      'Tap',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

输出: