FlagListTableViewCell.swift

class FlagListTableViewCell: UITableViewCell, ReusableView {
    private let flagImageView = UIImageView()
    private var cellHeightConstraint: NSLayoutConstraint!
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        
        self.cellHeightConstraint = self.flagImageView.heightAnchor.constraint(equalToConstant: 0)
        self.cellHeightConstraint.isActive = true
                
        self.flagImageView.contentMode = .scaleAspectFit
        self.flagImageView.translatesAutoresizingMaskIntoConstraints = false

        self.contentView.addSubview(self.flagImageView)
        
        self.flagImageView.pinEdges(to: self.contentView)
    }
    
    @available(*, unavailable)
    required init?(coder _: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func layoutSubviews() {
        let imageViewWidth = self.contentView.frame.width
        let imageWidth = CGFloat(self.flagImageView.image!.cgImage!.width)
        let imageHeight = CGFloat(self.flagImageView.image!.cgImage!.height)
        
        let scaledHeight = imageHeight * (imageViewWidth / imageWidth)
        self.cellHeightConstraint.constant = scaledHeight
    }
    
    func bind(to country: Country) {
        let image = UIImage(named: country.flagImageName)!
        self.flagImageView.image = image
    }
}