An extension to initialize custom view.

UIView+Initialize.swift

// please don't forget to add the custom class for your UIView on the interface builder.
public extension UIView {
    static func initFromNib() -> Self {
        guard let view = UINib(nibName: String(describing: self), bundle: nil)
                .instantiate(withOwner: nil, options: nil).first as? Self else {
                    fatalError("Could not init view")
                }
        return view
    }
}