Single view accessory view

SingleViewAccessory.swift

final class SingleViewAccessory: UIView {
    
    //  MARK: - Контент
    
    private let contentView: UIView
    
    //  MARK: - Инициализация
    
    init(content: UIView, background: UIColor = .clear) {
        //  Контент
        self.contentView = content
        
        //  Инициализация
        super.init(frame: .zero)
        
        //  Сабвью
        self.addSubview(self.contentView)
        
        //  Настройка
        self.autoresizingMask   = .flexibleHeight
        self.backgroundColor    = background
    }
    
    @available(*, unavailable)
    required init?(coder: NSCoder) { fatalError() }
    
    //  MARK: - Размеры
    
    override var intrinsicContentSize: CGSize {
        CGSize(
            width:  UIScreen.main.bounds.width,
            height: self.contentView.sizeThatFits(UIScreen.main.bounds.size).height + self.safeAreaInsets.bottom
        )
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        //  Размеры
        let size:   CGSize  = self.frame.size
        let height: CGFloat = ceil(self.contentView.sizeThatFits(size).height)
        
        //  Расстановка
        self.contentView.frame = CGRect(x: 0.0, y: 0.0, width: UIScreen.main.bounds.width, height: height)
    }
    
    //  MARK: - Цикл жизни
    
    override func safeAreaInsetsDidChange() {
        super.safeAreaInsetsDidChange()
        self.invalidateIntrinsicContentSize()
    }
}