Fun with MotionEffect

ParallaxFun.swft

func addParallaxMotionEffects(tiltValue: CGFloat = 0.25, panValue: CGFloat = 5) {
        var xTilt = UIInterpolatingMotionEffect()
        var yTilt = UIInterpolatingMotionEffect()
        var xPan = UIInterpolatingMotionEffect()
        var yPan = UIInterpolatingMotionEffect()
        let motionGroup = UIMotionEffectGroup()

        xTilt = UIInterpolatingMotionEffect(
            keyPath: "layer.transform.rotation.y",
            type: .tiltAlongHorizontalAxis
        )
        xTilt.minimumRelativeValue = -tiltValue
        xTilt.maximumRelativeValue = tiltValue

        yTilt = UIInterpolatingMotionEffect(
            keyPath: "layer.transform.rotation.x",
            type: .tiltAlongVerticalAxis
        )
        yTilt.minimumRelativeValue = -tiltValue
        yTilt.maximumRelativeValue = tiltValue

        xPan = UIInterpolatingMotionEffect(
            keyPath: "center.x",
            type: .tiltAlongHorizontalAxis
        )
        xPan.minimumRelativeValue = -panValue
        xPan.maximumRelativeValue = panValue

        yPan = UIInterpolatingMotionEffect(
            keyPath: "center.y",
            type: .tiltAlongVerticalAxis
        )
        yPan.minimumRelativeValue = -panValue
        yPan.maximumRelativeValue = panValue

        motionGroup.motionEffects = [xTilt, yTilt, xPan, yPan]

        addMotionEffect(motionGroup)
    }