App Update issue - iphone

Question

Hi everybody I have an issue in my app. I need to determine if my app has has been updated to some point. I found out with this method how I can get the current version
NSString *first = [[[NSBundle mainBundle] infoDictionary] objectForKey:#"CFBundleShortVersionString"];
NSString *second = [[[NSBundle mainBundle] infoDictionary] objectForKey:#"CFBundleVersion"];
If the app is updated from itunes, Who var is changed to determine my app has been updated because I prove by modification from xcode in the Targets>Summary>Version to prove .The first var changes but the second does not change.
What I have to select the first or the second, and how I can prove this?

Answer 1

I'm not sure if this is what you are looking for but this code can tell you if your app has been updated by storing version information in NSUserDefaults.
- (BOOL)wasUpdated {
// access NSUserDefaults
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
// get previous version number from defaults
NSString *previousVersion = [defaults stringForKey:#"previousVersion"];
// get current version number from info plist
NSString *currentVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:#"CFBundleVersion"];
// check against previousVersion being nil
if (!previousVersion) {
// set current version to previous version
[defaults setObject:currentVersion forKey:#"previousVersion"];
// previousVersion didn't exist and can't be checked, return NO
return NO;
}
// return YES if the versions are not the same
if (NSOrderedSame != [previousVersion compare:currentVersion]) return YES;
// return NO if they are the same
return NO;
}
Hopefully that's what you needed. Tell me if I didn't understand what you meant.