Chameleon provides color management for iOS Development.

Keean Rush of RayWenderlich tutorial on using Chameleon. The SDK provides the tools to generate perfect color scheme for your app. I especially like the tools to match any image/photograph.

https://www.raywenderlich.com/179287/using-chameleon-framework-ios

Github for Chameleon: https://github.com/ViccAlexander/Chameleon