hi,I want to transition an an older project to support Slide Over and Split View of iOS 9,but I find all the demo projects I found was written by storyboard or xib, but my older project's UI is written by code, can any one suggest, thanks!
I would suggest switching to storyboards to make your life easy.
I would highly recommend you watch the following WWDC videos and then think about what exactly you need to do in order to support multi tasking.
Mysteries of Auto Layout, Part 1
Implementing UI Designs in Interface Builder