Swift: UIView 3d transform animation style: horizontal flip

uibutton.3d.transform.swift

        let layer = sender.layer
        var rotationAndPerspectiveTransform : CATransform3D = CATransform3DIdentity
        rotationAndPerspectiveTransform.m34 = 1.0 / -1000
        rotationAndPerspectiveTransform = CATransform3DRotate(rotationAndPerspectiveTransform, CGFloat(M_PI / 0.3), 0.0, 1.0, 0.0)
        layer.transform = rotationAndPerspectiveTransform
        UIView.animateWithDuration(2.0, animations: {
            layer.transform = CATransform3DIdentity
        })

thanks, it helped a lot