1、需求
首先、针对UILabel中显示的多个功能标签，作出颜色标记提示。
其次、对关键字作出点击响应动作。
如图所示：
解决：
1、使用正则匹配到关键字
public static var hashtag = DetectorType.custom(try! NSRegularExpression(pattern: "#[\\u4e00-\\u9fa5a-zA-Z0-9]{1,}", options: []))
扩展：获取字符串中满足正则表达式的字符串
func matches(for regex: String, in text: String) -> [String] { do { let regex = try NSRegularExpression(pattern: regex) let results = regex.matches(in: text, range: NSRange(text.startIndex..., in: text)) return results.map { String(text[Range($0.range, in: text)!]) } } catch let error { print("invalid regex: \(error.localizedDescription)") return [] } }
tags = CommonUseClass._sharedManager.matches(for: "#[\\u4e00-\\u9fa5a-zA-Z0-9]{1,}", in: model.text)
2、对关键字作出点击手势判断
extension UIGestureRecognizer { func didTapAttributedTextInLabel(label: UILabel, inRange targetRange: NSRange) -> Bool { let layoutManager = NSLayoutManager() let textContainer = NSTextContainer(size: CGSize.zero) let textStorage = NSTextStorage(attributedString: label.attributedText!) layoutManager.addTextContainer(textContainer) textStorage.addLayoutManager(layoutManager) textContainer.lineFragmentPadding = 0.0 textContainer.lineBreakMode = label.lineBreakMode textContainer.maximumNumberOfLines = label.numberOfLines let labelSize = label.bounds.size textContainer.size = labelSize let locationOfTouchInLabel = self.location(in: label) let textBoundingBox = layoutManager.usedRect(for: textContainer) let textContainerOffset = CGPoint(x: (labelSize.width - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x, y: (labelSize.height - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y) let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x, y: locationOfTouchInLabel.y - textContainerOffset.y) let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil) return NSLocationInRange(indexOfCharacter, targetRange) } }
3、获取点击的字符串，并作出响应
if self.tags.count > 0 { var isSelectTag = false var selectTag = "" for tag in self.tags { let termsRange = (self.messageText as NSString).range(of: tag) if gesture.didTapAttributedTextInLabel(label: self.messageLabel, inRange: termsRange) { isSelectTag = true selectTag = tag break } } if isSelectTag { delegate?.selectTag(selectTag) return } }
