如何在Flutter中使用十六进制颜色字符串？

在Flutter中，

Color

fromARGB

fromRGBO

因此，我们只需要将字符串转换为

#b74093

255

FF

0xFF

const color = const Color(0xffb74093); // Second `const` is optional in assignments.

可以选择是否将字母大写：

const color = const Color(0xFFB74093);

从Dart开始

2.6.0

extension

Color

Color

extension HexColor on Color {  /// String is in the format "aabbcc" or "ffaabbcc" with an optional leading "#".  static Color fromHex(String hexString) {    final buffer = StringBuffer();    if (hexString.length == 6 || hexString.length == 7) buffer.write('ff');    buffer.write(hexString.replaceFirst('#', ''));    return Color(int.parse(buffer.toString(), radix: 16));  }  /// Prefixes a hash sign if [leadingHashSign] is set to `true` (default is `true`).  String toHex({bool leadingHashSign = true}) => '${leadingHashSign ? '#' : ''}'      '${alpha.toRadixString(16).padLeft(2, '0')}'      '${red.toRadixString(16).padLeft(2, '0')}'      '${green.toRadixString(16).padLeft(2, '0')}'      '${blue.toRadixString(16).padLeft(2, '0')}';}

fromHex

mixin

class

HexColor

toHex

void main() {  final Color color = HexColor.fromHex('#aabbcc');  print(color.toHex());  print(const Color(0xffaabbcc).toHex());}

这里的许多其他答案都显示了如何

Color

const