How to check iOS version, in a C file?

Question

I have some C files that are dependent on iOS 9, (using new features from the accelerate framework) and want to be able to check the current iOS version without using Objective-C.

Is there anyway to do this?

Possible duplicate: http://stackoverflow.com/questions/3339722/how-to-check-ios-version — Chimera, Nov 06 '15 at 21:42
Don't check the iOS version. Check for the availability of the API you wish to use. — rmaddy, Nov 06 '15 at 21:49
@rmaddy thanks, can you elaborate? If I want to use vDSP_biquadm_SetTargetsDouble() what would that look like? — olynoise, Nov 06 '15 at 21:50

score 4 · Accepted Answer · answered Nov 06 '15 at 21:53

Do not check the version of iOS. The proper solution is to check if the desired API is available. In this case you wish to use the vDSP_biquadm_SetTargetsDouble function. As described in the SDK Compatibility Guide, the proper way is this:

if (vDSP_biquadm_SetTargetsDouble != NULL) {
    // The vDSP_biquadm_SetTargetsDouble function exists, use it here
} else {
    // There is no vDSP_biquadm_SetTargetsDouble function. Do something else (or nothing)
}

How to check iOS version, in a C file?

1 Answers1