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Asked: 2026-06-04T22:04:27+00:00

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html says it is …should prevent users from editing that preference by disabling any

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https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html says it is

…should prevent users from editing that preference by disabling any
appropriate controls.

The NSUserDefaults class is thread-safe. Persistence of NSURL and
file reference URLs…

This long discussion says it isn’t

http://www.cocoabuilder.com/archive/cocoa/155227-nsuserdefaults-thread-safety.html

So which one is right? Also why the difference of opinion.

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1 Answer

  1. Editorial Team

    The Apple iOS 5.1 and OS X 10.7 documentation say that it is thread-safe; therefore it is thread-safe.

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