ios - finding unsupported apis with os version

Question

I've developed and application for iPhone. It works fine on os4 but it does not work on os3.1. In fact works but there are some problems; after splash screen a what screen appears. while I leaving the application I can see the application is opened successfully but just see while exiting.

So I wonder if there is a tool which says which apis have problems with os3.1? So I have a chance to replace them.

Answer 1

If you want to check a specific API, just run this in your code somewhere with an appropriate response. For example, to see if print is supported, run this...

if (NSClassFromString(@"UIPrintInfo")) {

}