Generic protocol for loading views from xib

CallingNotificationView.swift

import UIKit

class AnyViewClass: UIView {}
extension AnyView: NibInstantiable { }

let view: AnyViewClass = .fromNib()
type(of: view) //will be AnyViewClass

NibInstantiable.swift

import Foundation
import UIKit

public protocol NibInstantiatable: class {}

public extension UIView {

  public static func fromNib<AnyView>() -> AnyView
    where AnyView: NibInstantiatable {
      guard let view = self.nib
        .instantiate(withOwner: nil, options: nil)
        .first as? AnyView else { fatalError("Can not load \(AnyView.self) from xib") }
      return view
  }

  public static var nib: UINib {
    return UINib(
      nibName: identifier,
      bundle: Bundle(for: self)
    )
  }

  public static var identifier: String {
    return String(describing: self)
  }
}