我假设你要自定义的日期选择器 不同 ，从你的主旋律。通常，日期选择器遵循您的主题。
如果是这样，请将触发操作的按钮包装在的
Builder内部
Theme。例如，这是一个FAB，它会弹出一个橙色的日期选择器（在轻材料应用程序主题中），并从主主题继承其余部分。
floatingActionButton: new Theme( data: Theme.of(context).copyWith( primaryColor: Colors.amber, ), child: new Builder( builder: (context) => new FloatingActionButton( child: new Icon(Icons.date_range), onPressed: () => showDatePicker( context: context, initialDate: new DateTime.now(), firstDate:new DateTime.now().subtract(new Duration(days: 30)), lastDate: new DateTime.now().add(new Duration(days: 30)), ), ), ), ),
检查date_picker.dart的源代码以查看主题的哪些部分会影响日期选择器的不同方面。
如果您只是想让选择器遵循主题，这是一个工作示例
import 'package:flutter/material.dart';class PickerThemeDemo extends StatelessWidget { @override Widget build(BuildContext context) { return new Scaffold( appBar: new AppBar(title: const Text('Picker theme demo')), body: new Container(), floatingActionButton: new FloatingActionButton( child: new Icon(Icons.date_range), onPressed: () => showDatePicker( context: context, initialDate: new DateTime.now(), firstDate: new DateTime.now().subtract(new Duration(days: 30)), lastDate: new DateTime.now().add(new Duration(days: 30)), ), ), ); }}Color hexToColor(int rgb) => new Color(0xFF000000 + rgb);class CustomTheme extends Theme { //Primary Blue: #335C81 (51, 92, 129) //Light Blue: #74B3CE (116, 179, 206) //Yellow: #FCA311 (252, 163, 17) //Red: #E15554 (255, 85, 84) //Green: #3BB273 (59, 178, 115) static Color blueDark = hexToColor(0x335C81); static Color blueLight = hexToColor(0x74B3CE); static Color yellow = hexToColor(0xFCA311); static Color red = hexToColor(0xE15554); static Color green = hexToColor(0x3BB273); CustomTheme(Widget child) : super( child: child, data: new ThemeData( primaryColor: blueDark, accentColor: yellow, cardColor: blueLight, backgroundColor: blueDark, highlightColor: red, splashColor: green, ), );}void main() { runApp( new MaterialApp( home: new CustomTheme(new PickerThemeDemo()), ), );}如果要将主题应用于整个应用程序，则可以将其最简洁地添加到Material应用程序中（无需CustomTheme类）：
Color hexToColor(int rgb) => new Color(0xFF000000 + rgb);void main() { runApp( new MaterialApp( theme: new ThemeData( brightness: Brightness.light, primaryColor: hexToColor(0x335C81), accentColor: hexToColor(0xFCA311), splashColor: hexToColor(0x3BB273), ), home: new PickerThemeDemo(), ), );}
