Any way to change the RGB coefficient for individual layers at runtime?

I seem to be able to change the RGB coefficient for all the layers under storyboard controls -> Frame -> Effect.
But the RGB controls for the layer object is disabled once the iOS runtime is selected. However, I can adjust the RBG in the layer window before I run. Is there some kind of technical limitation as to why the RGB controls on the layer object are disabled on ios?

Any other way to do this on ios?