containsEmoji, editedWord of UITextView

extension UITextView {

    func editedWord() -> String? {

        if text.containsEmoji {
            return nil
        }

        let cursorPosition = selectedRange.location
        let separationCharacters = NSCharacterSet(charactersInString: " ")

        let beginRange = Range(text.startIndex.advancedBy(0)..<text.startIndex.advancedBy(cursorPosition))
        let endRange = Range(text.startIndex.advancedBy(cursorPosition)..<text.startIndex.advancedBy(text.characters.count))

        let beginPhrase = text.substringWithRange(beginRange)
        let endPhrase = text.substringWithRange(endRange)

        let beginWords = beginPhrase.componentsSeparatedByCharactersInSet(separationCharacters)
        let endWords = endPhrase.componentsSeparatedByCharactersInSet(separationCharacters)

        return beginWords.last! + endWords.first!
    }
}

extension String {

    var containsEmoji: Bool {
        for scalar in unicodeScalars {
            switch scalar.value {
            case 0x1F600...0x1F64F, // Emoticons
            0x1F300...0x1F5FF, // Misc Symbols and Pictographs
            0x1F680...0x1F6FF, // Transport and Map
            0x2600...0x26FF,   // Misc symbols
            0x2700...0x27BF,   // Dingbats
            0xFE00...0xFE0F:   // Variation Selectors
                return true
            default:
                continue
            }
        }
        return false
    }

}