So, a very common thing to want to do in your application is to display the version string. However, unless you know where to look, this can actually be a somewhat frustrating thing to try and do. The key here is the NSBundle class which will return you the main application bundle which you can then get an NSDictionary class from. Once you have the NSDictionary, you can then query any of the paired values from the info.plist file.
Sample code below for getting the App Version and the Copyright text.

+ (NSString*) GetAppVersion
{
return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];
}

+ (NSString*) GetAppCopyright
{
return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"NSHumanReadableCopyright"];
}