Using the UIMotionEffects to create dynamic gradient effects.
In this example project, a Gradient is added to a Text Heading and then it's starting and ending point made to update with UIMotionEffects, creating a dynamic gradient that changes position based on the device's horizontal and vertical tilt and movement.
A custom UIMotionEffect Class is created to update the CAGradientLayer:
override func keyPathsAndRelativeValues(forViewerOffset viewerOffset: UIOffset) -> [String : Any]? {
gradient?.startPoint.x = 1 + viewerOffset.horizontal
gradient?.startPoint.y = 0.5 + viewerOffset.vertical
gradient?.endPoint.x = 0 + viewerOffset.horizontal
gradient?.endPoint.y = 1 + viewerOffset.vertical
return nil
}
The result looks something like this:
