属性初始化程序在“自我”可用之前运行 [英] Property initializers run before 'self' is available

问题描述

似乎我在某些本不应该出现的问题上遇到了问题...但是我想寻求帮助。

Seems like I'm having a problem with something that shouldn't be the case... But I would like to ask for some help.

有

具有两个简单的类，其中一个引用另一个，如下所示；

Having two simple classes where one refers to another, as per below;

class User {
  lazy var name: String = ""
  lazy var age: Int = 0

  init (name: String, age: Int) {
      self.name = name
      self.age = age
  }
}

class MyOwn {
  let myUser: User = User(name: "John", age: 100)
  var life = myUser.age 
  //Cannot use instance member 'myUser' within property initializer
  //property initializers run before 'self' is available
}

我得到了注释编译错误。有人可以告诉我该怎么办吗？

I get the commented compile error. May someone please tell me what should I do to solve the case?

非常感谢任何好人的帮助！

Many thanks to any good man for help!

推荐答案

如 vadian 所正确指出的，您应该在以下情况下创建 init ：

As correctly pointed by vadian you should create an init in such scenarios:

class MyOwn {
    let myUser: User
    var life: Int

    init() {
        self.myUser = User(name: "John", age: 100)
        self.life = myUser.age 
    }
}

您不能为依赖依赖于另一个实例属性的存储属性提供默认值。

You can't provide a default value for a stored property that depend on another instance property.

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