Swift 1.2：在super.init调用之前使用的'self'

Question

I have this code:

class SomeViewController : UIViewController {

 let deferred : ()->()

 required init(coder aDecoder : NSCoder) {
    deferred = {
        self.doSomething()
    }

    super.init(coder: aDecoder)
 }

 func doSomething() {
    // Does things....
 }

}

In Swift 1.2 this fails to compile with the error:

'self' used before super.init call

In pre-1.2 days, we can address this in a number of ways such as implicitly unwrapped conditionals. That approach won't work any longer.

I've seen other answers reference 2-stage initialization or the lazy decorator, but both sacrifice immutability of the property. Surely this must be solvable in Swift 1.2, but I'm out of ideas.

Answer 1

Here's an interim workaround:

private(set) var deferred : ()->() = { }

required init(coder aDecoder : NSCoder) {
    super.init(coder: aDecoder)
    self.deferred = {
        self.doSomething()
    }

}

My thinking is, okay, we did "sacrifice immutability of the property", but from a public perspective the property remains immutable because the setter is private.