Property initializers run before 'self' is available

Question

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

There are some explanations here on the Stack I don't get.

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 } 

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

Answer 1

As correctly pointed out 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      } } 

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

Answer 2

You should declare life like this:

lazy var life:Int = {     return self.myUser.age }() 

Because you are trying to initialise one property(variable) with another during initialisation process. At this time variables are not available yet.