how to check if CLLocationCoordinate2DIsValid is available?

Question

i'd like to use the CLLocationCoordinate2DIsValid - check, which is available in iOS 4.0 and later.

how can i prevent this from being called on a iOS 3 device (it wil crash...)?

i tried with:

if (CLLocationCoordinate2DIsValid != NULL) {
  //use the check
} else {
  //do a own check
}

why do iOS3 devices try to "use the check" instead of "do a own check"? how would one call the CLLocationCoordinate2DIsValid properly - and only if it's available on the current iOS running?

Answer 1

Your syntax isn't quite right for the dynamic loader. I asked the same question.