The image cannot be passed during the View transition.

@IBOutlet weak var image1:UIImageView!
@IBOutlet weak var image2:UIImageView!

override func prepare(for segment:UIStoryboardSegue, sender:Any?) {
    let vc2 = segue.destination as!ViewController2
    vc2.image3 = self.image1.image
    vc2.image4=self.image2.image
}

@IBOutlet weak var image21:UIImageView!
@IBOutlet weak var image22:UIImageView!

var image3:UIimage?
var image4:UIimage?

override func viewDidLoad(){
    super.viewDidLoad()

    self.image21.image=image3
    self.image22.image=image4
}