Connect the UISwitch to an action we can animate switching between a horizontal or vertical layout of the image views

suggest change
@IBAction func axisChange(sender: UISwitch) {
    UIView.animateWithDuration(1.0) {

The updateConstraintForAxis function just sets the axis of the stack view containing the two image views:

private func updateConstraintsForAxis() {
    if (axisSwitch.on) {
        stackView.axis = .Horizontal
    } else {
        stackView.axis = .Vertical

The animated gif below gives you an idea of how this appears:

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