How to create a parallax effect in UIKit
Parallax effects have been standard since iOS 7.0, and the UIInterpolatingMotionEffect class makes this easy by automatically smoothing accelerometer input so your views can adjust to tilt data.
If you want to have a UIView respond to tilting, add this function to your code then call it on any view you want:
func addParallaxToView(vw: UIView) {
let amount = 100
let horizontal = UIInterpolatingMotionEffect(keyPath: "center.x", type: .tiltAlongHorizontalAxis)
horizontal.minimumRelativeValue = -amount
horizontal.maximumRelativeValue = amount
let vertical = UIInterpolatingMotionEffect(keyPath: "center.y", type: .tiltAlongVerticalAxis)
vertical.minimumRelativeValue = -amount
vertical.maximumRelativeValue = amount
let group = UIMotionEffectGroup()
group.motionEffects = [horizontal, vertical]
vw.addMotionEffect(group)
}Available from iOS 7.0
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