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I am using NSKeyedArchiver to archive and retrieve a UITextView. This works in the I can retrieve most of UITextView. However I cannot save and retrieve info about the border which is stored in a CALayer.              let tvdata = try NSKeyedArchiver.archivedData(withRootObject: textview! as UITextView, requiringSecureCoding: false)             let tvtmp = try! (NSKeyedUnarchiver.unarchiveTopLevelObjectWithData((self.tvdata?.regularFileContents)!) as? UITextView)!             let myAtmp = UITextView.unsecureUnarchived(from: tvdata)             print("textview.layer.borderWidth = \(textview!.layer.borderWidth)")             print("myAtmp.layer.borderWidth = \(myAtmp!.layer.borderWidth)")               let tvWrapper:FileWrapper = FileWrapper.init(regularFileWithContents:tvdata as Data)             let tmptv = UITextView.unsecureUnarchived(from: (tvWrapper.regularFileContents!))             Both tvTmp and myAtmp contains all of the usual UITextView values. Neither has the value for borderWidth. The printed values are : textview.layer.borderWidth = 3.0 myAtmp.layer.borderWidth = 0.0 tmptv.layer.borderWidth = 0.0 How can I archive and unarchive the borderWidth value?