How can I check what hardware my iPhone app is running on?

Question

I'm writing an app that needs to function differently if it is running on different models of the iPhone/iPod Touch. How can I check if the app is running on 3GS, 3G or other?

Answer 1

See here:

http://stackoverflow.com/questions/1543925/how-do-i-detect-whether-i-have-iphone-2g-3g-3gs/1546070#1546070

Answer 2

The UIDevice class provides some information like this.

But you're probably much better off testing for capabilities ("does this device support compass headings?") than for specific models ("is this device a 3GS?"). What is it that you're trying to do?

Edit: for the specific example I presented above, see the headingAvailable property of CLLocationManager. It will be YES if and only if heading information can be obtained from the device.