Gist with source code for the Medium article about NSAttributedString

AttributedString.swift

import UIKit

struct MovieInfo {
	let title: String
	let description: String
	let cast: [ActorInfo]
}

struct ActorInfo {
	let character: String
	let name: String
	let revenue: String
}

struct Colors {
	static let textPrimary: UIColor = #colorLiteral(red: 0.172114253, green: 0.1933369339, blue: 0.2129674852, alpha: 1)
	static let textSecondaty: UIColor = #colorLiteral(red: 0.2862745098, green: 0.3137254902, blue: 0.3411764706, alpha: 1)
	static let greenText: UIColor = #colorLiteral(red: 0.1764705882, green: 0.4156862745, blue: 0.3098039216, alpha: 1)
}

struct Fonts {
	static let title: UIFont = .systemFont(ofSize: 24, weight: .bold)
	static let description: UIFont = .systemFont(ofSize: 16, weight: .regular)
	static let subtitle: UIFont = .systemFont(ofSize: 18, weight: .bold)
	static let actorName: UIFont = .systemFont(ofSize: 16, weight: .semibold)
	static let actorCharacter: UIFont = .systemFont(ofSize: 16, weight: .regular)
	static let actorRevenue: UIFont = .systemFont(ofSize: 16, weight: .medium)
}

class ViewController: UIViewController {
	
	let movie: MovieInfo = MovieInfo(
		title: "Avengers: Infinity War",
		description: "The Avengers and their allies must be willing to sacrifice all in an attempt to defeat the powerful Thanos before his blitz of devastation and ruin puts an end to the universe.",
		cast: [ActorInfo(character: "Tony Stark", name: "Robert Downey Jr.", revenue: "$ 75 000 000"),
			   ActorInfo(character: "Thor", name: "Chris Hemsworth", revenue: "$ 15 000 000"),
			   ActorInfo(character: "Captain America", name: "Chris Evans", revenue: "$ 15 000 000"),
			   ActorInfo(character: "Spider-Man", name: "Tom Holland", revenue: "$ 3 000 000")]
	)

	var contentView: MainView {
		view as! MainView
	}
	
	override func loadView() {
		super.loadView()
		view = MainView()
	}

	override func viewDidLoad() {
		super.viewDidLoad()
		contentView.set(movie)
	}


}

class MainView: UIView {

	let label: UILabel = {
		let label = UILabel()
		label.translatesAutoresizingMaskIntoConstraints = false
		label.numberOfLines = 0
		return label
	}()

	init() {
		super.init(frame: .zero)
		setup()
	}

	required init?(coder: NSCoder) {
		super.init(coder: coder)
	}

	func setup() {
		backgroundColor = .white
		addSubview(label)
		NSLayoutConstraint.activate([
			label.topAnchor.constraint(equalTo: safeAreaLayoutGuide.topAnchor, constant: 32),
			label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16),
			label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16),
			label.bottomAnchor.constraint(equalTo: safeAreaLayoutGuide.bottomAnchor, constant: -32)
		])
	}

	func set(_ movie: MovieInfo) {
		let result = NSMutableAttributedString()
		result.append(NSAttributedString(
			string: "\(movie.title)\n",
			attributes: [.font : Fonts.title, .foregroundColor : Colors.textPrimary])
		)
		result.append(.spacing(8))

		result.append(NSAttributedString(
			string: "\(movie.description)\n",
			attributes: [.font : Fonts.description, .foregroundColor : Colors.textSecondaty])
		)
		result.append(.spacing(16))
		
		result.append(NSAttributedString(
			string: "Top cast:\n",
			attributes: [.font : Fonts.subtitle, .foregroundColor : Colors.textPrimary])
		)
		result.append(.spacing(4))
		
		movie.cast.forEach { result.append(createTextBlock(for: $0)) }
		label.attributedText = result
	}

	func createTextBlock(for actor: ActorInfo) -> NSAttributedString {
		let result = NSMutableAttributedString()
		result.append(NSAttributedString(
			string: actor.name + "\n",
			attributes: [.font : Fonts.actorName,
						 .foregroundColor : Colors.textPrimary])
		)
		result.append(NSAttributedString(
			string: actor.character + ", ",
			attributes: [.font : Fonts.actorCharacter,
						 .foregroundColor : Colors.textSecondaty])
		)
		result.append(NSAttributedString(
			string: actor.revenue + "\n",
			attributes: [.font : Fonts.actorRevenue,
						 .foregroundColor : Colors.greenText])
		)

		let paragraphStyle = NSMutableParagraphStyle()
		paragraphStyle.lineSpacing = 4

		result.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: result.length))
		result.append(.spacing(12))
		return result
	}
}

extension NSAttributedString {
	static func spacing(_ size: CGFloat) -> NSAttributedString {
		let paragraphStyle = NSMutableParagraphStyle()
		paragraphStyle.minimumLineHeight = size
		paragraphStyle.maximumLineHeight = size
		let spacing = NSAttributedString(string: "\n", attributes: [.paragraphStyle : paragraphStyle])
		return spacing
	}
}