title: iOS/iPhone Get FrameBuffer from GLKViewController
body: <p>How do I get the FrameBuffer or RenderBuffer from a 'GLKViewController' on iOS/iPhone so I can pass it to 'glBindFramebuffer' ??</p>
  
  <p>I'm trying to render to a RenderTarget and then switch back to the main BackBuffer to present other information.</p>
  
  <p>On all other platforms "Windows, OSX, Linux and Android" setting 'glBindFramebuffer(GL_FRAMEBUFFER, 0);' to '0' causes the system to set the default FrameBuffer.  Why is this different on iOS ?</p>
  
  <p>Also I notice 'GLKView' has the 'bindDrawable' method, which is basically 'glBindFramebuffer'... Where is this method in 'GLKViewController' ?</p>