Xib file reusable

SameNameWithXibFile.swift

class SameNameWithXibFile: UIView, XibReusable {
    var contentView: UIView!
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        xibSetup()
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        xibSetup()
    }
}

XibReuable.swift

protocol XibReusable: AnyObject {
    var contentView: UIView! { get set }
    func xibSetup()
}

extension XibReusable where Self: UIView {
    func xibSetup() {
        contentView = loadViewFromNib()
        contentView.frame = bounds
        contentView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        addSubview(contentView)
    }
    
    func loadViewFromNib() -> UIView {
        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: String(describing: type(of: self)), bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil).first as? UIView
        return view!
    }
}