Tap Links in UILabel

Tap links in UILabel.swift

// Setup Label

let label: UILabel = {
	let label = UILabel()
	label.isUserInteractionEnabled = true
	
	label.adjustsFontSizeToFitWidth = true
	label.numberOfLines = 0
	
	label.textColor = UIColor(white: 0, alpha: 1)
	label.tintColor = UIColor.red
	
	label.textAlignment = .center
	
	let fontSize: CGFloat = 20
	
	label.font = UIFont.systemFont(ofSize: fontSize, weight: .medium)
	
	// - Attributes
	
	let attributes: [NSAttributedString.Key : Any] = [
		.font : UIFont.systemFont(ofSize: fontSize, weight: .regular),
		.foregroundColor: UIColor(white: 0, alpha: 0.6)
	]
	
	let linkAttributes: [NSAttributedString.Key : Any] = [
		.font : UIFont.systemFont(ofSize: fontSize, weight: .medium),
		.foregroundColor: UIColor(white: 0, alpha: 1),
		.attachment: "https://google.com"
	]
	
	let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: "", attributes: attributes)
	
	attributedString.append(NSAttributedString(
		string: "Hello",
		attributes: attributes
	))
	
	attributedString.append(NSAttributedString(
		string: " World ",
		attributes: linkAttributes
	))
	
	attributedString.append(NSAttributedString(
		string: "Testing",
		attributes: attributes
	))
	
	label.attributedText = attributedString
	
	label.layer.borderWidth = 1
	label.layer.borderColor = UIColor(white: 0, alpha: 1).cgColor
	
	return label
}()


// MARK: - Tap Label

@objc func tappedOnLabel(tapGesture: UITapGestureRecognizer) {
	guard tapGesture.state == .recognized else { return }
	print("tapGesture.state: \(tapGesture.state)")
	
	let locationOfTouchInLabel: CGPoint = tapGesture.location(in: self._view.label)
	
	print("self.tapLabel( locationOfTouchInLabel: \(locationOfTouchInLabel) )")
	
	let label: UILabel = self._view.label
	
	let attributedText: NSAttributedString = label.attributedText!
	
	// Create instances of NSLayoutManager, NSTextContainer and NSTextStorage
	let layoutManager: NSLayoutManager = NSLayoutManager()
	let textContainer: NSTextContainer = NSTextContainer(size: CGSize.zero)
	let textStorage: NSTextStorage = NSTextStorage(attributedString: 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: CGSize = label.bounds.size
	textContainer.size = labelSize
	
	let textBoundingBox: CGRect = layoutManager.usedRect(for: textContainer)
	
	// - NSTextStorage
	
	let textContainerOffset: CGPoint = 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 = CGPoint(
		x: locationOfTouchInLabel.x - textContainerOffset.x,
		y: locationOfTouchInLabel.y - textContainerOffset.y
	)
	
	let indexOfCharacter: Int = layoutManager.characterIndex(
		for: locationOfTouchInTextContainer,
		in: textContainer,
		fractionOfDistanceBetweenInsertionPoints: nil
	)
	
	let attachment = attributedText.attribute(.attachment, at: indexOfCharacter, effectiveRange: nil)
	
	print("attachment: \(attachment) - \( type(of: attachment) )")
	
	if let textLink: String = attachment as? String,
	   let url: URL = URL(string: textLink)
	{
		UIApplication.shared.open(url)
	}
}