How to make custom buttons in iOS?

Question

The default iOS UI is nice but if I wanted to use images for buttons instead how would I do that - is it OpenGL?

Answer 1

Well so far i was too looking for using custom buttons and the graphics, I've come through this site they have some awesome tutorial which was quite helpful for me. I've watched all the video tutorial and read some books but nothing helped me but this site and their 4 books are quite awesome and really helpful to read and understand it well.

http://www.raywenderlich.com/27191/learn-to-code-ios-apps-4-making-it-beautiful