Is it mandatory to call NSUserDefaults synchronize method?

Question

Please, anyone, help me: Is calling NSUserDefaults\'s synchronize() method mandatory?. If I don\'t call it, what will happen? My application is wor

Answer 1

From the docs:

Because this method is automatically invoked at periodic intervals, use this method only if you cannot wait for the automatic synchronization (for example, if your application is about to exit) or if you want to update the user defaults to what is on disk even though you have not made any changes.

Meaning that if you kill the app right after something is written to the defaults without the periodic interval catching it, it will get lost. You probably did not kill the app right after a write event yet which is why your app seems to work fine so far.