我发现的另一个不健康的解决这个问题的方法是

String myName = "shahzad";

print(myName.substring(0,1).toUpperCase() + myName.substring(1));

这将产生同样的效果，但这是一种相当肮脏的方式。

extension StringExtension on String {
  String capitalize() {
    return this
        .toLowerCase()
        .split(" ")
        .map((word) => word[0].toUpperCase() + word.substring(1, word.length))
        .join(" ");
  }
}

对于感兴趣的人，这应该适用于任何字符串

从dart 2.6版本开始，dart支持扩展:

extension StringExtension on String {
    String capitalize() {
      return "${this[0].toUpperCase()}${this.substring(1).toLowerCase()}";
    }
}

所以你可以像这样调用你的扩展:

import "string_extension.dart";

var someCapitalizedString = "someString".capitalize();

还应该检查字符串是空还是空。

String capitalize(String input) {
  if (input == null) {
    throw new ArgumentError("string: $input");
  }
  if (input.length == 0) {
    return input;
  }
  return input[0].toUpperCase() + input.substring(1);
}

如果您使用get: ^4.6.5作为flutter的状态管理，则有用于大写的内置扩展

        // This will capitalize first letter of every word
        print('hello world'.capitalize); // Hello World

        // This will capitalize first letter of sentence
        print('hello world'.capitalizeFirst); // Hello world

        // This will remove all white spaces from sentence
        print('hello world'.removeAllWhitespace); // helloworld

        // This will convert string to lowerCamelCase
        print('This is new world'.camelCase); // thisIsNewWorld

        // This will remove all white spaces between the two words and replace it with '-'
        print('This is new    world'.paramCase); // this-is-new-world

var original = "this is a string";
var changed = original.substring(0, 1).toUpperCase() + original.substring(1);