Simple bullet point UILabel rendering for iOS

gistfile1.txt

import UIKit
import PlaygroundSupport

struct StringConstants {
    static let bullet = "This is a long string, which should make the label wrap to multiple lines, showing us that the bullet point has rendered correctly with a sufficient indent on subsequent lines of text."
}

class MyViewController : UIViewController {
    private let label = UILabel()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        view.backgroundColor = .white
        setupLabel()
        
        let stringAttributes: [NSAttributedString.Key: Any] = [.font: label.font!]
        let bulletString = makeBulletString(bullet: "▶︎ ",
                                            content: StringConstants.bullet,
                                            attributes: stringAttributes)
        label.attributedText = bulletString
    }
    
    private func makeBulletString(bullet: String,
                                  content: String,
                                  attributes: [NSAttributedString.Key: Any]) -> NSAttributedString {
        let fullString: String = "\(bullet)\(content)\n"
        let attributedString: NSMutableAttributedString = NSMutableAttributedString(string: fullString,
                                                                                    attributes: attributes)
        
        let headerIndent = (bullet as NSString).size(withAttributes: attributes).width
        attributedString.addAttributes([.paragraphStyle: makeParagraphStyle(headIndent: headerIndent)],
                                       range: NSMakeRange(0, attributedString.length))
        return attributedString
    }
    
    private func makeParagraphStyle(headIndent: CGFloat) -> NSParagraphStyle {
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.firstLineHeadIndent = 0
        paragraphStyle.headIndent = headIndent
        
        return paragraphStyle
    }
}

extension MyViewController {
    private func setupLabel() {
        view.addSubview(label)
        label.numberOfLines = 0
        label.font = UIFont.preferredFont(forTextStyle: .headline)
        
        label.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            label.topAnchor.constraint(equalTo: view.topAnchor, constant: 10),
            label.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 10),
            label.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -10),
        ])
    }
}

PlaygroundPage.current.liveView = MyViewController()