I have been trying to figure this out without success. I created a storyboard which has a GLKView embedded in a GLK View Controller (I can't post an image since I don't have enough reputation points yet). I can't seem to have my drawing code use the GLKView rather than the GLK View Controller's view for drawing. I've tried doing the following in ViewDidLoad in myGLKViewController.m:
GLKView *view = (GLKView *)self.view;
view.context = self.context;
// adding to make myGLKView the actual view used
self.view.frame = _myGLKView.frame;
[self.view addSubview:_myGLKView];
[Note: _myGLKView is the outlet for the embedded GLKView in the storyboard. Using the debugger, it does have the correct bounds, so I know I'm on the right track]. I've tried various combinations of this and I can't get it to work at all. I'm using the xcode 4.5.1 and iOS 6. Thanks in advance for any ideas.