问如何添加无序列表或UITextView中的每一行新行的项目点

EN

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        //
        // If the replacement text is "\n" and the
        // text view is the one you want bullet points
        // for
        if (text == "\n") {
            // If the replacement text is being added to the end of the
            // text view, i.e. the new index is the length of the old
            // text view's text...


            if range.location == textView.text.count {
                // Simply add the newline and bullet point to the end
                let updatedText: String = textView.text! + "\n \u{2022} "
                textView.text = updatedText
            }
            else {

                // Get the replacement range of the UITextView
                let beginning: UITextPosition = textView.beginningOfDocument
                
                let start: UITextPosition = textView.position(from: beginning, offset: range.location)!
                let end: UITextPosition = textView.position(from: start, offset: range.length)!
                
                let textRange: UITextRange = textView.textRange(from: start, to: end)!
                // Insert that newline character *and* a bullet point
                // at the point at which the user inputted just the
                // newline character
                textView.replace(textRange, withText: "\n \u{2022} ")
                // Update the cursor position accordingly
                let cursor: NSRange = NSMakeRange(range.location + "\n \u{2022} ".count, 0)
                textView.selectedRange = cursor
            }

            return false


        }
        // Else return yes
        return true
    }