Flutter - 如何更改 TextField 提示顏色？

Question

我有點困惑如何更改文本字段的提示顏色。 有人可以指導我怎么做。謝謝

child: TextField(
   style: TextStyle(fontSize: 20),
   decoration: InputDecoration(
                  hintText: "Password",
                  border: new OutlineInputBorder(
                            borderSide: new BorderSide(
                              color: Colors.teal,
                            ),
                          ),
                   prefixIcon: const Icon(
                            Icons.security,
                            color: Colors.white,
                          ),
                ),
   ),

Answer 1

您可以使用hintStyle ：在InputDecoration

TextField(
        style: TextStyle(fontSize: 20),
        decoration: InputDecoration(
          hintText: "Password",
          hintStyle: TextStyle(fontSize: 20.0, color: Colors.redAccent),
          border: OutlineInputBorder(
            borderSide: BorderSide(
              color: Colors.teal,
            ),
          ),
          prefixIcon: const Icon(
            Icons.security,
            color: Colors.white,
          ),
        ),
      ),

Answer 2

作為已接受答案的補充，要更新重點提示裝飾，您必須更新應用程序的主題。

@override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
          primaryColor: Colors.white,
          inputDecorationTheme: const InputDecorationTheme(
            labelStyle: TextStyle(color: Colors.black),
            hintStyle: TextStyle(color: Colors.grey),
          )),
      home: MainScreen(),
    );
  }

Answer 3

更改hintStyle 和labelStyle

TextFormField(
              decoration: InputDecoration(
                hintText: 'username@mail.com',
                labelText: 'Email',
               hintStyle: TextStyle(color: Colors.white), # change to your color
                labelStyle: TextStyle(color: Colors.white), # change color
             ))

Answer 4

在挖掘了用於確定標簽顏色的 InputDecorator 的源代碼后，這是我發現的。

TextStyle _getFloatingLabelStyle(ThemeData themeData) {
  final Color color = decoration.errorText != null
    ? decoration.errorStyle?.color ?? themeData.errorColor
    : _getActiveColor(themeData);
  final TextStyle style = themeData.textTheme.subtitle1.merge(widget.baseStyle);
  return style
    .copyWith(color: decoration.enabled ? color : themeData.disabledColor)
    .merge(decoration.labelStyle);
}

Color _getActiveColor(ThemeData themeData) {
  if (isFocused) {
    switch (themeData.brightness) {
      case Brightness.dark:
        return themeData.accentColor;
      case Brightness.light:
        return themeData.primaryColor;
    }
  }
  return themeData.hintColor;
}

簡而言之，要更改提示顏色，請使用 Theme 和 ThemeData 設置hintColor。

另一個提示：要更改標簽顏色，請設置primaryColor 淺色主題，或設置深色主題的accentColor。

ThemeData.dark().copyWith(
  primaryColor: Colors.red,
  accentColor: Colors.white,
  hintColor: Colors.pink,
)

Answer 5

TextField(
   decoration: InputDecoration(
   hintText: 'your hint',
   hintStyle: Theme.of(context).textTheme.caption.copyWith(
   fontSize: 20,
   fontWeight: FontWeight.w600,
   color: ColorConstants.kTextColor,  <--- // Set Your Own Color
   ),

Answer 6

如果您想更改應用程序中所有 TextField Widget 的hintColor，您可以在主題中應用它。

示例代碼：

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.light().copyWith(
        hintColor: Colors.orange,
      ),
      home: Scaffold(
        body: Column(children: [
          TextField(
            decoration: InputDecoration(
              hintText: "Email",
            ),
          ),
          TextField(
            decoration: InputDecoration(
              hintText: "Password",
            ),
          ),
        ]),
      ),
    );
  }
}