fileprivate var StringIdentifierHandle: UInt8 = 2

extension UIView {

    var stringIdentifier: String? {
        get {
            return objc_getAssociatedObject(self, &StringIdentifierHandle) as? String
        }
        set {
            objc_setAssociatedObject(self, &StringIdentifierHandle, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
}