问题
We have an app that uses OpenGL and MKMapView. When we switched to iOS 6 it started crashing at [EAGLContext setCurrentContext:] with EXC_BAD_ACCESS whenever we tried to display a map after setting our own EAGLContext.
回答1:
iOS 6 maps are OpenGL based. Your app will crash if you don't call
[EAGLContext setCurrentContext:nil]
after you have set your own EAGLContext. We fixed our bug by putting the above call into the dealloc method of our class that was interacting with EAGLContext.
来源：https://stackoverflow.com/questions/12670528/ios-6-app-crashes-in-eaglcontext-when-displaying-maps