我如何大写字符串的第一个字符，而不改变任何其他字母的情况?
例如，“this is a string”应该给出“this is a string”。
当前回答
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
其他回答
String fullNameString =
txtControllerName.value.text.trim().substring(0, 1).toUpperCase() +
txtControllerName.value.text.trim().substring(1).toLowerCase();
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。
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
截至2021年3月23日，Flutter 2.0.2
只需使用yourtext.capitalizeFirst
把这个拷贝到某个地方:
extension StringCasingExtension on String {
String toCapitalized() => length > 0 ?'${this[0].toUpperCase()}${substring(1).toLowerCase()}':'';
String toTitleCase() => replaceAll(RegExp(' +'), ' ').split(' ').map((str) => str.toCapitalized()).join(' ');
}
用法:
// import StringCasingExtension
final helloWorld = 'hello world'.toCapitalized(); // 'Hello world'
final helloWorld = 'hello world'.toUpperCase(); // 'HELLO WORLD'
final helloWorldCap = 'hello world'.toTitleCase(); // 'Hello World'
