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Extension for UITapGesture that contains a function to detect range of particular text in UILabel's text.
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| extension UITapGestureRecognizer { | |
| func didTapAttributedTextInLabel(label: UILabel, inRange targetRange: NSRange) -> Bool { | |
| // Create instances of NSLayoutManager, NSTextContainer and NSTextStorage | |
| let layoutManager = NSLayoutManager() | |
| let textContainer = NSTextContainer(size: CGSize.zero) | |
| let textStorage = NSTextStorage(attributedString: label.attributedText!) | |
| // Configure layoutManager and textStorage | |
| layoutManager.addTextContainer(textContainer) | |
| textStorage.addLayoutManager(layoutManager) | |
| // Configure textContainer | |
| textContainer.lineFragmentPadding = 0.0 | |
| textContainer.lineBreakMode = label.lineBreakMode | |
| textContainer.maximumNumberOfLines = label.numberOfLines | |
| let labelSize = label.bounds.size | |
| textContainer.size = labelSize | |
| // Find the tapped character location and compare it to the specified range | |
| 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); | |
| var indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: textContainer, fractionOfDistanceBetweenInsertionPoints: nil) | |
| indexOfCharacter = indexOfCharacter + 4 | |
| return NSLocationInRange(indexOfCharacter, targetRange) | |
| } | |
| } |
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@geek-Shayan Thanks for the simplified code.
I am still facing some issue problem where the characterIndex is calculated incorrectly as the Number of lines increases.
I found UILabel's attributed text's default size is slightly larger than UITextView's Attributed Text (which uses layoutManager and textStorage inside it).
For now the working solution is giving the entire attributed string constant font size or scaledValue
attributes: [.font: UIFont.systemFont(ofSize: UIFontMetrics.default.scaledValue(for: xSize))]Tag me if anyone found proper solution