Class List
  The classes and protocols in Google VR iOS API Reference:
| CGVRAudioEngine | High-level Google VR Audio Engine | 
| CGVRCardboardView | Defines a view responsible for rendering graphics in VR mode | 
| C<GVRCardboardViewDelegate> | Defines a delegate protocol for GVRCardboardView  | 
| CGVRFieldOfView | Defines a struct to hold half field of view angles, in degrees, for an GVREye eye  | 
| CGVRHeadRotation | Contains yaw and pitch angles corresponding to where the user is looking | 
| CGVRHeadTransform | Defines a class to represent the head transformation for a render frame | 
| CGVRPanoramaView | Defines a view that can load and display 360-degree panoramic photos | 
| CGVRVideoView | Defines a player view that renders a 360 video using OpenGL | 
| C<GVRVideoViewDelegate> | Defines a protocol to notify delegates of change in video playback | 
| CGVRWidgetView | Defines a base class for all widget views, that encapsulates common functionality | 
| C<GVRWidgetViewDelegate> | Defines a delegate for GVRWidgetView and its subclasses |