What to consider on app updates?

Question

I wonder if there is any kind of good documentation or tutorial for what to consider when updating an iOS app to a new version? I think especially of the following questions:

• Updating version & build numbers: Is there anything to consider or is it just to increase the numbers in Xcode?
• Is there any possibility to run specific code (updating methods) on the update or after the first launch of the update (e.g. if the data model has changed or if the user's data has to be updated)? How can this be tested in simulator or on testing devices?
• Core Data: What about updating the model in Core Data? How can this be done?

Answer 1

When I do my updates I usually:

• prepare the update in iTunes connect
• update version/build in xcode

• for specific update code I simply do in appdelegate - didfinishlaunchwithoptions:

  if(![[NSUserDefaults standardUserDefaults] objectForKey:@"updateV31"]) { [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"updateV31"]; [[NSUserDefaults standardUserDefaults] synchronize]; //your code here }

• for core data, you can use the lightweit migration method, I didn't have issues so far after updates

• for tests, download the current version from the appstore, then add the new version from xcode to your device, it will come as an update over existing app