Swift3 UIPickerView animate image

Hi, I have a UIPickerView with 2 images in each row, I would like to animate one of the images when it is selected ...I have been able to animate the whole pickerview when the selection changes (in didSelectRow), but I want to just animate one of the images

with the code below ...in the didSelectRow function how would I reference the selected "firstImage" image to apply the animation?

Instead of memoryPicker.transform I've tried...

pickerView.firstImage.transform -  which gives error: Value of type 'UIPickerView' has no member 'firstImage'
And
view.firstimage.transform -  gives error: Value of type 'UIView' has no member 'firstImage'
Thanks

[code]@IBOutlet weak var memoryPicker: UIPickerView!

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

// The number of rows of data
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

    return objectsToRemember.count
}

func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
    return 100
}

func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

    let view = UIView(frame: CGRect(x: 0, y:0, width: 250, height: 100))

    let firstImage = UIImageView()
        firstImage.image = UIImage(named:objectsToRemember[row])
        firstImage.frame = CGRect(x: 0, y: 0, width: 100, height: 100)

    let secondImage = UIImageView()
    secondImage.image = UIImage(named:objectsToRemember[row])
    secondImage.frame = CGRect(x: 150, y: 0, width: 100, height: 100)

    view.addSubview(firstImage)
    view.addSubview(secondImage)

    return view
}

// Actions
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {

    //animate
    memoryPicker.transform = CGAffineTransform(scaleX: 0.2, y: 0.2)
    UIView.animate(withDuration: 1.5, delay: 0, usingSpringWithDamping: 0.4, initialSpringVelocity: 0, options: .allowUserInteraction, animations: {

        self.memoryPicker.transform = .identity

    }) { (success) in

    }
}[/code]