在Swift中初始化一个在self上有闭包的let属性的最佳方法是什么？

Question

你可能知道Swift中的初始化规则是非常严格的（如果你问我就太严格了）。我发现自己处于不得不初始化一个需要关闭自己的let属性的情况，当然这个抱怨者抱怨。类似下面的例子。

let aString: String
let delete: Action<Int, Int, NoError>

init(aString: String) {
  self.aString = aString
  self.delete = Action { [unowned self](index) in 
    return self.performDeletion(index)
  }
}

func performDeletion(index: Int) -> SignalProduer<Int, NoError> {
  // Some deletion logic
}

唯一的解决方案＆＃34;我发现是使用像这样的私有变量

let aString: String

private let _delete: Action<Int, Int, NoError>
var delete: Action<Int, Int, NoError> {
  return _delete!
}

init(aString: String) {
  self.aString = aString
  _delete = Action { [unowned self](index) in 
    return self.performDeletion(index)
  }
}

func performDeletion(index: Int) -> SignalProduer<Int, NoError> {
  // Some deletion logic
}

还有其他解决方案吗？