Question

I’m finishing iCloud feature for my app and can’t solve one problem:
Since I’m using some new 5.0 features like NSFileCoordinator, I can’t build my app for 4.3 because of “dyld: Symbol not found: _OBJC_CLASS_$_NSFileCoordinator”.
How can I “untarget” some files (which have iCloud methods) for building 4.3 version?
Thanks in advance!

Answer 1

Have a look at this.

Class cls = NSClassFromString (@"NSFileCoordinator");
if (cls) {
    // Create an instance of the class and use it.
} else {
    // Alternate code path to follow when the
    // class is not available.
}

Also check this answer to see why

you should avoid relying on the version string as an indication of device or OS capabilities.