AssociatedObject of swift version

swiftassociatedobject.swift

private struct AssociatedKeys {
  static var <#name#> = "<#name#>"
}

var <#name#>: String? {
  get {
    return objc_getAssociatedObject(self, &AssociatedKeys.<#name#>) as? String
  }

  set {
    if let newValue = newValue {
      objc_setAssociatedObject(self, &AssociatedKeys.<#name#>, newValue as String?,
        .OBJC_ASSOCIATION_RETAIN_NONATOMIC
      )
    }
  }
}