Вставить простой текст, когда я копирую текст с кодом ниже.
let range = NSMakeRange(0, tvTexta.attributedText!.length)
let rtfData = try! tvTexta.attributedText!.data(from: range,
documentAttributes: [ NSAttributedString.DocumentAttributeKey.documentType: NSAttributedString.DocumentType.rtf])
UIPasteboard.general.items = [
[ kUTTypePlainText as String : tvTexta.text! ],
[ kUTTypeRTF as String : rtfData ]
]