延迟var给出'实例成员不能用于类型'错误 [英] Lazy var giving 'Instance member can not be used on type' error

问题描述

我现在有几次这个错误，我采用了不同的解决方法，但我真的很好奇它为什么会发生。基本场景如下：

I had this error several times now and I resorted to different workarounds, but I'm really curious why it happens. Basic scenario is following:

class SomeClass {
  var coreDataStuff = CoreDataStuff!
  lazy var somethingElse = SomethingElse(coreDataStuff: coreDataStuff)
}

所以我理解我不能在类完全初始化之前使用self，但是在这种情况下我使用自身属性 coreDataStuff 来初始化一个懒惰的var，直到我的实例准备好才会发生。

So I understand I can not use self before class is fully initialised, but in this case I'm using self property coreDataStuff to initialise a lazy var which will not happen until my instance is ready.

任何人都可以解释我为什么我得到
实例成员不能用于类型错误？

Anybody could explain me why I'm getting Instance member can not be used on type error?

推荐答案

试试看：

class SomeClass {
  var coreDataStuff = CoreDataStuff!
  lazy var somethingElse: SomethingElse = SomethingElse(coreDataStuff: self.coreDataStuff)
}

确定lazy var的类型并将 self。添加到您传递的参数

It is important to precise the type of your lazy var and to add self. to the argument you pass

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