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Editorial Team
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Asked: 2026-06-02T05:29:54+00:00

I started the Xcode template using GLKit but my intention is to have a

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I started the Xcode template using GLKit but my intention is to have a window showing the OpenGL part of the view and UIKit for controls.

GLKViewController comes with a GLKView. I went to IB and removed the GLKView and added a UIView, putting a new GLKView on top at the size I want. Then I fixed the references to the GLKView (self.view) and set the smaller GLKView’s delegate to the view controller.

I got

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[GLKViewController loadView] loaded the "2-view-9XZ-07-hga" nib but didn't get a GLKView.'

Then I looked at docs and find that GLKViewController requires GLKView as its view. No surprise. Yes I’m new at this.

What’s a good way to use GLKit with a GLKView smaller than fullscreen? Or is mixing UIKit and GLKit just not done?

(update: a lot of people are finding this question; Duncan’s answer, using view controller containment, worked well.)

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1 Answer

  1. Editorial Team

    You can, but GLKit doesn’t make it obvious how.

    The problem is that GLKViewController is designed so it’s content view is a GLKView, as you say.

    You have two choices.

    1. Create a GLKView and put it in a regular view controller. That works fine.

    2. Create a GLKViewController with a GLKView as its content, and make it a child view of another view controller, using the new parent/child view controller support in iOS 5.

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