ProfileLoader.swift

func showUserPhoto(for user: User, on imageView: UIImageView, placeholderImage: UIImage? = nil) {
  if let photoImage = user.photoImage else {
    imageView.image = photoImage
  } else if let photoUrl = user.photoUrl else {
    imageView.sd_setImageWithURL(photoUrl, placeholderImage:placeholderImage)
  } else {
    imageView.image = placeholderImage
  }
}