How to detect if app automatically updated in iOS 7

Question

I want to be able to display an alert describing what's new when an app has been updated. What's the best way to do this, especially considering iOS 7 automatically updates apps? Thanks!

Answer 1

You can store the app version in NSUserDefaults. Then if the old app version != current app version you can display your dialog

Version #:

NSString * version = [[NSBundle mainBundle] objectForInfoDictionaryKey: @"CFBundleShortVersionString"];

Set:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:version forKey:@"appVersion"];

Get:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults objectForKey:@"appVersion"];

Answer 2

When the user starts your app, check a version string in user defaults or a file or database.

If you want to do it around the time the app is updated, you might be able to use push notifications in conjunction with the version check. I don't know whether you can get the new app to check the version in the background, though (never used push notifications myself).