當我在特定位置點擊UITextView時，我想更改該特定行的顏色

Question

1. 我有一個textView

2. 當我點擊textview的特定區域時，我找到了行號，但無法獲取該行的文本

3. 我需要獲取特定行的文本並僅在textview中更改該文本的顏色

     func HandleTapped(sender: UITapGestureRecognizer) { print("tapped") if sender.state == .recognized { let location = sender.location(ofTouch: 0, in: TextView) print(location) if location.y >= 0 && location.y <= TextView.contentSize.height { guard let font = TextView.font else { return } let line = Int((location.y - TextView.textContainerInset.top) / font.lineHeight) + 1 print("Line is \\(line)") let text=TextView.textContainer print(text) } } } 

Answer 1

使用此擴展UITextView可以獲取當前所選行的文本行：

func getLineString() -> String {
    return (self.text! as NSString).substringWithRange((self.text! as NSString).lineRangeForRange(self.selectedRange))
}

然后，您需要從那里將所有文本更改為屬性文本，並將所選行文本的范圍僅更改為突出顯示顏色。 就像是：

let allText = textView.text
let lineText = textView.getLineString()

let attrText = NSMutableAttributedString(string: allText)

let regularFont = UIFont(name: "Arial", size: 30.0)! // Make this whatever you need
let highlightFont = UIFont(name: "Arial-BoldMT", size: 30.0)! // Make this whatever you need

//  Convert allText to NSString because attrText.addAttribute takes an NSRange.
let allTextRange = (allText as NSString).rangeOfString(allText)
let lineTextRange = (allText as NSString).rangeOfString(lineText)

attrText.addAttribute(NSFontAttributeName, value: regularFont, range: allTextRange)
attrText.addAttribute(NSFontAttributeName, value: highlightFont, range: lineTextRange)

textView.attributedText = attrText