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class MyClass {
}

private var key: Void?

extention MyClass {
  var title: String? {
    get {
      return objc_getAssociatedObject(self, &key) as? String
    }
    set {
      objc_setAssociatedObject(self, &key, newValue, .OBJC_ASSOCIATED_RETAIN_NONATOMIC)
    }
  }
}