We have now launched our iCentrum photosphere VR app onto the Apple App Store. Just search for "icentrumvr" to download it to your iPhone. The app has both a VR and non-VR modes. In VR mode you can use it with a Google Cardboard headset for the full immersive experience. In non-VR mode you get a single screen display, and can just move the phone around you in order see the whole of the spherical image.
As with the Android version there 6 images, linked by the red hotspots, and an information zone with more details of the iCentrum building and supporting projects.