Method to load a view from its nib

LoadNibView.swift

// Note: this should be converted into an extension of a new protocol, 
// such that the return type is the actual type and not a static `UIView`

extension UIView {
  static func nibInstance() -> UIView? {
    if let view = Bundle.mainBundle.loadNibNamed(String.className(self), owner: nil, options: nil)?.first as? UIView { 
      return loginView
    } 
    return nil 
  }  
}