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

Answer 1

Set your project's Base SDK to iphone-os-3-1, then build. All the error messages about classes, methods, and functions that don't exist must designate things added since iphone-os-3-1, since your project built and linked fine against the iphone-os-4-0 SDK.

If you don't have the iphone-os-3-1 SDK, try this instead:

• Open your project's Build Settings.
• Find the "Preprocessor Macros" setting.
• Edit it and add __IPHONE_OS_VERSION_MAX_ALLOWED=30100

Now, try building. This should cause everything introduced after iOS 3.1 to be labeled unavailable, producing the same errors as if you had switched to the iphone-os-3-1 SDK.