UIXibView.swift

class UIXibView: UIView {
    
    public var nibName:String? { return String(describing: type(of: self)) }
    
    public var contentView: UIView!
    
    override public init(frame: CGRect) {
        super.init(frame: frame)
        awakeFromNib()
    }
    
    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    override open func awakeFromNib() {
        super.awakeFromNib()
        guard let nibName = self.nibName,
        let view = Bundle.main.loadNibNamed(nibName, owner: self, options: nil)?.first as? UIView
        else { return }
        self.layoutIfNeeded()
        contentView = view
        contentView.frame = self.bounds
        contentView.autoresizingMask = [.flexibleHeight,.flexibleWidth]
        self.addSubview(contentView)
    }
}