gistfile1.txt

#define LAST_VERSION_RUN				@"Settings.LastVersionRun"

-(BOOL)isFirstRunForVersion
{
// get the current version
NSString *currentVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"];

// get the last version run
NSUserDefaults* preferences = [NSUserDefaults standardUserDefaults];
NSString *lastVersion = [preferences objectForKey:LAST_VERSION_RUN];

// is this a new version being run?
if (![currentVersion isEqual:lastVersion]) {

  //do some stuff here


// yes, record this as the last version run now
[preferences setObject:currentVersion forKey:LAST_VERSION_RUN];
[preferences synchronize];

// return yes
return YES;

} else {

// no, return no
return NO;

}

}