[NSUserDefaults synchronize] is Planned to be Deprecated

-synchronize is deprecated and will be marked with the NS_DEPRECATED macro in a future release.

-synchronize blocks the calling thread until all in-progress set operations have completed. This is no longer necessary. Replacements for previous uses of -synchronize depend on what the intent of calling synchronize was. If you synchronized…
— …before reading in order to fetch updated values: remove the synchronize call
— …after writing in order to notify another program to read: the other program can use KVO to observe the default without needing to notify
— …before exiting in a non-app (command line tool, agent, or daemon) process: call CFPreferencesAppSynchronize(kCFPreferencesCurrentApplication)
— …for any other reason: remove the synchronize call



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