iOS swift UITextView行间距
func textViewDidChange(_ textView: UITextView) {
let mutableAttrStr = NSMutableAttributedString(string: textView.text)
let style = NSMutableParagraphStyle()
style.lineSpacing = 27
mutableAttrStr.addAttributes([NSParagraphStyleAttributeName:style], range: NSMakeRange(0, mutableAttrStr.length))
textView.attributedText = mutableAttrStr
}
