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 [英] Flutter how to make a variable private and initialize it with @required in constructor

问题描述

我如何使该字段私有化并在课程中用 @required 进行注释？

How can I make the field private and annotate it with @required in a class?

例如，这段代码给我错误：

For example this code gives me error:

class AuthenticationService {
  final Api _api;

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

推荐答案

class AuthenticationService {
  final Api _api;

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

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