SwiftUI HTML string parsing Text component

DynamicAttributedTextView.swift

struct DynamicAttributedTextView: UIViewRepresentable {
	
	// MARK: - Constants
	private static let attributes: [NSAttributedString.Key : Any] = [.font: CustomFont().UIKitFont()!,
																	 .foregroundColor: UIColor.appPrimaryText,
																	 .paragraphStyle: DynamicAttributedTextView.paragraphStyle]
	private static let types: NSTextCheckingResult.CheckingType = [.link, .address, .phoneNumber]
	private static let paragraphStyle: NSParagraphStyle = {
		
		let paragraphStyle: NSMutableParagraphStyle = NSMutableParagraphStyle()
		paragraphStyle.lineSpacing                  = 4
		
		return paragraphStyle
	}()
	
	// MARK: - Properties
	private var text: String
	private let width: CGFloat
	@Binding private var height: CGFloat
	
	// MARK: - Coordinator
	class Coordinator: NSObject, UITextViewDelegate {
		
		// MARK: - Properties
		let rep: DynamicAttributedTextView
		
		// MARK: - Init
		init(_ rep: DynamicAttributedTextView) {
			self.rep = rep
		}
		
		// MARK: - Updates
		func textViewDidChange(_ textView: UITextView) {
			textView.delegate = self
		}
		
		func textView(_ textView: UITextView, shouldInteractWith textAttachment: NSTextAttachment, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
			return true
		}
		
		func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange, interaction: UITextItemInteraction) -> Bool {
			if interaction != .preview {
				DeepLinkRouter.open(URL)
				return false
			}
			return true
		}
	}
	
	// MARK: - Init
	init(_ text: String, width: CGFloat, height: Binding<CGFloat>) {		
		self.width   = width
		self._height = height
		self.text    = text
	}
	
	// MARK: - Updates
	func makeUIView(context: Context) -> UITextView {
		
		let view: UITextView              = UITextView()
		view.backgroundColor              = .clear
		view.delegate                     = context.coordinator
		view.autoresizingMask             = [.flexibleWidth, .flexibleHeight]
		view.dataDetectorTypes            = [.link, .address, .phoneNumber, .shipmentTrackingNumber]
		view.showsVerticalScrollIndicator = false
		view.isEditable                   = false
		view.isSelectable                 = true
		view.isUserInteractionEnabled     = false
		view.tintColor                    = .black
		view.textColor                    = .black
		view.linkTextAttributes           = [.underlineStyle: NSUnderlineStyle.single.rawValue,
											 .foregroundColor: UIColor.appPrimaryText]
		view.removeGestureRecognizer(view.panGestureRecognizer)
		
		if UIDevice.current.userInterfaceIdiom == .pad {
			DispatchQueue.main.async {
				view.attributedText = self.text.HTMLAttributedString(DynamicAttributedTextView.attributes)
			}
		} else {
			view.attributedText = self.text.HTMLAttributedString(DynamicAttributedTextView.attributes)
		}
		
		let size: CGSize = view.systemLayoutSizeFitting(.init(width: self.width, height: .infinity))
		view.contentSize = size
		view.bounds      = .init(origin: .zero, size: size)
		
		DispatchQueue.main.async {
			self.height = size.height
		}

		return view
	}
	
	func updateUIView(_ view: UITextView, context: Context) {

	}
	
	func makeCoordinator() -> Coordinator {
		Coordinator(self)
	}
}

extension String {
	
	func HTMLAttributedString(_ attributes: [NSAttributedString.Key : Any]? = nil) -> NSAttributedString {
		
		guard let data = self.replacingOccurrences(of: "\n", with: "<br>").data(using: .utf8) else {
			return NSAttributedString(string: self, attributes: attributes)
		}
		
		if let attributedString = try? NSMutableAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil) {
			if let attributes = attributes {
				attributedString.addAttributes(attributes, range: NSRange(location: 0, length: attributedString.length))
			}
			return attributedString
		}
		
		return NSAttributedString(string: self, attributes: attributes)
	}
}