Creating NSView from XIB file

NSView+NibLoadable.swift

// For views that can be loaded from nib file
protocol NibLoadable {
    // Name of the nib file
    static var nibName: String { get }
    static func createFromNib(in bundle: Bundle) -> Self
}

extension NibLoadable where Self: NSView {

    // Default nib name must be same as class name
    static var nibName: String {
        return String(describing: Self.self)
    }

    static func createFromNib(in bundle: Bundle = Bundle.main) -> Self {
        var topLevelArray: NSArray? = nil
        bundle.loadNibNamed(NSNib.Name(nibName), owner: self, topLevelObjects: &topLevelArray)
        let views = Array<Any>(topLevelArray!).filter { $0 is Self }
        return views.last as! Self
    }
}