Pasted

// a replacement for UILabel
class TextViewLabel: UITextView {
    
    public var numberOfLines: Int = 0 {
        didSet {
            textContainer.maximumNumberOfLines = numberOfLines
        }
    }
    public var lineBreakMode: NSLineBreakMode = .byTruncatingTail {
        didSet {
            textContainer.lineBreakMode = lineBreakMode
        }
    }
    
    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
    }
    
    private func commonInit() -> Void {
        isScrollEnabled = false
        isEditable = false
        isSelectable = false
        textContainerInset = UIEdgeInsets.zero
        textContainer.lineFragmentPadding = 0
    }
    
}
 
class ViewController: UIViewController {
    
    let labelStackView = UIStackView()
    let textViewStackView = UIStackView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let scrollView = UIScrollView()
        
        let hStack = UIStackView()
        hStack.axis = .horizontal
        hStack.spacing = 8
        hStack.distribution = .fillEqually
        hStack.alignment = .top
        
        [labelStackView, textViewStackView].forEach { v in
            v.axis = .vertical
            v.spacing = 4
            hStack.addArrangedSubview(v)
        }
        
        hStack.translatesAutoresizingMaskIntoConstraints = false
        scrollView.addSubview(hStack)
 
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(scrollView)
        
        let g = view.safeAreaLayoutGuide
        let cg = scrollView.contentLayoutGuide
        let fg = scrollView.frameLayoutGuide
 
        NSLayoutConstraint.activate([
            
            scrollView.topAnchor.constraint(equalTo: g.topAnchor, constant: 20.0),
            scrollView.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
            scrollView.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
            scrollView.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -20.0),
 
            hStack.topAnchor.constraint(equalTo: cg.topAnchor, constant: 8.0),
            hStack.leadingAnchor.constraint(equalTo: cg.leadingAnchor, constant: 8.0),
            hStack.trailingAnchor.constraint(equalTo: cg.trailingAnchor, constant: -8.0),
            hStack.bottomAnchor.constraint(equalTo: cg.bottomAnchor, constant: -8.0),
 
            hStack.widthAnchor.constraint(equalTo: fg.widthAnchor, constant: -16.0),
            
        ])
        
        let infoFont: UIFont = .italicSystemFont(ofSize: 10.0)
        let testFont: UIFont = .systemFont(ofSize: 12.0)
        
        var testStr: String = "This is some example text to test truncation consistency. At the end of this line, is a pair of newline chars:\n\nA HEADLINE\n\nThe headline was also followed by a pair of newline chars."
 
        for i in 3...10 {
            
            let infoLabel = UILabel()
            infoLabel.font = infoFont
            infoLabel.text = "UILabel - numLines: \(i)"
            labelStackView.addArrangedSubview(infoLabel)
            
            let v = UILabel()
            v.font = testFont
            v.numberOfLines = i
            v.text = testStr
            v.backgroundColor = .yellow
            v.lineBreakMode = .byTruncatingTail
            labelStackView.addArrangedSubview(v)
            
            labelStackView.setCustomSpacing(16.0, after: v)
            
        }
        
        for i in 3...10 {
            
            let infoLabel = UILabel()
            infoLabel.font = infoFont
            infoLabel.text = "TextViewLabel - numLines: \(i)"
            textViewStackView.addArrangedSubview(infoLabel)
            
            let v = TextViewLabel()
            v.font = testFont
            v.numberOfLines = i
            v.text = testStr
            v.backgroundColor = .cyan
            v.lineBreakMode = .byTruncatingTail
            textViewStackView.addArrangedSubview(v)
            
            textViewStackView.setCustomSpacing(16.0, after: v)
            
        }
        
        scrollView.backgroundColor = UIColor(white: 0.95, alpha: 1.0)
        
    }
    
}