Detecting If iPhone Is in a Dark Room

Reading the iPhone's Ambient Light sensor

Try using GSEventSetBacklightLevel();, which requires <GraphicsServices/GraphicsServices.h>. This is how one can programmatically adjust the brightness levels. There is also a get option, so I think that may have the information you're after.

iPhone Proximity Sensor

Assuming you mean the sensor that shuts off the screen when you hold it to your ear, I'm pretty sure that is just an infrared sensor inside the ear speaker. If you start the phone app (you don't have to be making a call) and hold something to cast a shadow over the ear speaker, you can make the display shut off.

When you asked this question it was not accessible via the public API. You can now access the sensor's state via UIDevice's proximityState property. However, it wouldn't be that useful for games, since it is only an on/off thing, not a near/far measure. Plus, it's only available on the iPhone and not the iPod touch.

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