To begin with there are a few frameworks we will need to add.
Do this by first selecting your projects main file in the project navigator pane.
Make sure your projects target is selected, and under Build Phases click ‘Link Binaries with Libraries’.
Use the + at the bottom of this display and add the QuartsCore and OpenGLES frameworks.
Next, using the ‘Add Other’ button, navigate to your downloaded NinevehGL folder and import the NinevehGL.framework.
Now onto the code…….import NinevehGL into your header (.h) file,
#import <NinevehGL/NinevehGL.h>
add the delegate to your @interface, if this is missing your drawview method will never get called.
@interface ViewController : UIViewController <NGLViewDelegate>;
Answer Referenced from icodeblog