If you are just supporting iOS 7 you can use tintColor and UIImageRenderingModeAlwaysTemplate
This article covers that:
https://www.captechconsulting.com/blogs/ios-7-tutorial-series-tint-color-and-easy-app-theming
If you need to support an earlier version you may want to consider this thread
How would I tint an image programmatically on the iPhone?