強置換行加點

textViewCodeSnippet.swift

    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if text == "\n" {
            let nsString = textView.text as NSString?
            let newString = nsString?.replacingCharacters(in: range,
                                                          with: "\n• ")
            textView.text = newString
            
            textView.sizeToFit()
            tableView.beginUpdates()
            tableView.endUpdates()
            return false
        } else {
            let char = text.cString(using: String.Encoding.utf8)!
            let isBackSpace = strcmp(char, "\\b") == -92
            
            if isBackSpace {
                if textView.text == "• " {
                    textView.sizeToFit()
                    tableView.beginUpdates()
                    tableView.endUpdates()
                    return false
                }
            }
        }
        
        return true
    }