Xcode allows to create launch screen in
No, it's not possible.
When launch screen is being displayed your app will be in loading state.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions will not be completely executed while the launch screen is displayed.
So it's clear that, you don't have any access to your app and so at this point you can't execute any code.