Flutter学习笔记

类型定义

Typescript的字符串字面量类型的定义方法，在Dart里没有对应的方法。只可以使用枚举实现，例如:

enum RoundedButtonSizes { small, regular, big }

class RoundedButton extends StatelessWidget {
	RoundedButton({this.size});
    final RoundedButtonSizes size;
    @override Widget build(BuildContext context) {
    	//...
    }
}

RoundedButton(size:RoundedButtonSizes.small);