Everything you need is:

extension UIButton {
  func imageToRight() {
      transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
      titleLabel?.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
      imageView?.transform = CGAffineTransform(scaleX: -1.0, y: 1.0)
  }
}

Show time:

button.imageToRight()

Cheers 👉