iOS push notifications - does application:didRegisterForRemoteNotificationsWithDeviceToken: execute in main thread?

I am wondering if an iOS app delegate's application:didRegisterForRemoteNotificationsWithDeviceToken: method executes in the main thread?

Ultimately I would like to know whether it is safe to pu开发者_StackOverflow中文版t UI code in this method and if I should keep blocking code (like network interactions) out of it.

In general, are delegate methods executed in the main thread?

The application delegate methods such as:

application:didRegisterForRemoteNotificationsWithDeviceToken:

are executed on the main thread.

If you want your application to be responsive for the user you should but blocking code in a background thread.

It is safe and recommended to execute UI code on the main thread.