flutter - Flutter 如何将变量设为私有并在构造函数中使用 @required 对其进行初始化

Question

如何将字段设为私有并@required在课堂上对其进行注释？

例如，这段代码给了我错误：

class AuthenticationService {
  final Api _api;

  AuthenticationService({@required this._api}); // error in this line
}

标签： flutterdart

Answer 1

class AuthenticationService {
  final Api _api;

  AuthenticationService({@required Api api}) : _api = api;
}