更改primaryColor和primaryColorDark颜色的代码不会改变边框的颜色，只有点击后颜色保持黑色
必须更改的属性是hintColor
BorderSide 不应该用于此，您需要更改主题。
要使红色默认将主题放在MaterialApp(theme: ...) 中并更改特定小部件的主题，例如将小部件的默认红色更改为黄色，请在小部件周围使用：
new Theme(
data: new ThemeData(
hintColor: Colors.yellow
),
child: ...
)
下面是代码和gif：
请注意，如果我们将 primaryColor 颜色定义为黑色，则通过点击小部件将其选择为黑色
但是要改变widget里面的label和text，我们需要设置theme为InputDecorationTheme
以黄色开头的小部件有自己的主题，以红色开头的小部件具有使用函数buildTheme()定义的默认主题
import 'package:flutter/material.dart';
void main() => runApp(new MyApp());
ThemeData buildTheme() {
final ThemeData base = ThemeData();
return base.copyWith(
hintColor: Colors.red,
primaryColor: Colors.black,
inputDecorationTheme: InputDecorationTheme(
hintStyle: TextStyle(
color: Colors.blue,
),
labelStyle: TextStyle(
color: Colors.green,
),
),
);
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
theme: buildTheme(),
home: new HomePage(),
);
}
}
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => new _HomePageState();
}
class _HomePageState extends State<HomePage> {
String xp = '0';
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(),
body: new Container(
padding: new EdgeInsets.only(top: 16.0),
child: new ListView(
children: <Widget>[
new InkWell(
onTap: () {},
child: new Theme(
data: new ThemeData(
hintColor: Colors.yellow
),
child: new TextField(
decoration: new InputDecoration(
border: new OutlineInputBorder(),
hintText: 'Tell us about yourself',
helperText: 'Keep it short, this is just a demo.',
labelText: 'Life story',
prefixIcon: const Icon(Icons.person, color: Colors.green,),
prefixText: ' ',
suffixText: 'USD',
suffixStyle: const TextStyle(color: Colors.green)),
)
)
),
new InkWell(
onTap: () {},
child: new TextField(
decoration: new InputDecoration(
border: new OutlineInputBorder(
borderSide: new BorderSide(color: Colors.teal)
),
hintText: 'Tell us about yourself',
helperText: 'Keep it short, this is just a demo.',
labelText: 'Life story',
prefixIcon: const Icon(Icons.person, color: Colors.green,),
prefixText: ' ',
suffixText: 'USD',
suffixStyle: const TextStyle(color: Colors.green)),
)
)
],
),
)
);
}
}