Best way to determine if my app was updated

Question

I have an IOS app, and each time it is updated I want to do some house cleaning. What is the best way to determine if an IOS app has been updated?

Answer 1

The simplest way may be to get the current version, compare the version to a saved version (if there is one), perform clean up if necessary, save the new version. Here are examples on retrieving and storing version info for comparison.

//Getting the application version
NSString *version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"]

//Retrieving the saved application version
NSString *savedVersion = [[NSUserDefaults standardUserDefaults] stringForKey:@"versionkey"];

//Saving the version
[[NSUserDefaults standardUserDefaults] setObject:version forKey:@"versionkey"];

And if you are wondering how to compare versions here is an example using the NSNumericSearch compare option: http://spitzkoff.com/craig/?p=148