Comments on: Read and Write User Preferences http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html iOS and Objective-C Tips, Tricks and Tutorials. Sat, 19 May 2012 05:15:17 -0500 hourly 1 http://wordpress.org/?v=3.3.2 By: John Muchow http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-69283 John Muchow Wed, 04 Apr 2012 23:49:10 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-69283 Good call Alex, looks like this got messed up during copy/paste from a project. I've updated the code example. Thanks. Good call Alex, looks like this got messed up during copy/paste from a project. I’ve updated the code example. Thanks.

]]> By: Alex http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-69282 Alex Wed, 04 Apr 2012 23:34:35 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-69282 Shouldn't this code: if ([[NSUserDefaults standardUserDefaults] integerForKey:@"startupTab"] == 0 be: if ([[NSUserDefaults standardUserDefaults] integerForKey:@"startupTab"] != 0 not equal to 0 so then that means if it is defined return the saved value and otherwise return the default...?? Shouldn’t this code:

if ([[NSUserDefaults standardUserDefaults] integerForKey:@”startupTab”] == 0

be:

if ([[NSUserDefaults standardUserDefaults] integerForKey:@”startupTab”] != 0

not equal to 0 so then that means if it is defined return the saved value and otherwise return the default…??

]]> By: Matt Di Pasquale http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-52830 Matt Di Pasquale Tue, 14 Jun 2011 21:24:31 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-52830 Objects stored by your app with NSUserDefaults (or Core Data, etc.) will not be deleted if a user upgrades to a newer version of your app. But, they will be deleted if the user deletes your app from their device. Objects stored by your app with NSUserDefaults (or Core Data, etc.) will not be deleted if a user upgrades to a newer version of your app. But, they will be deleted if the user deletes your app from their device.

]]> By: John Muchow http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-3873 John Muchow Mon, 06 Jul 2009 02:36:14 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-3873 It's my understanding that NSUserDefaults will be saved across updates to an application. Can anyone point to a specific document to confirm? It’s my understanding that NSUserDefaults will be saved across updates to an application.

Can anyone point to a specific document to confirm?

]]> By: Christian http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-3872 Christian Mon, 06 Jul 2009 02:02:34 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-3872 If I deploy something to the AppStore and use this method to save, for example the top scores of my game and later I put out a new version of the game, will the users lose their scores by installing the new version? If I deploy something to the AppStore and use this method to save, for example the top scores of my game and later I put out a new version of the game, will the users lose their scores by installing the new version?

]]> By: Rodney http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-150 Rodney Tue, 16 Dec 2008 20:28:34 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-150 Its also worth mentioning that if you in combination with NSCoder you can save even complex data types in the user defaults, not just primitive key-value types. This can be very handy when trying to keep track of a user session so that you can "restore" it if the app is abruptly exited. Its also worth mentioning that if you in combination with NSCoder you can save even complex data types in the user defaults, not just primitive key-value types. This can be very handy when trying to keep track of a user session so that you can “restore” it if the app is abruptly exited.

]]> By: pinknoiz http://MobileDeveloperTips.com/cocoa/read-and-write-user-preferences.html#comment-148 pinknoiz Mon, 15 Dec 2008 22:44:14 +0000 http://iPhoneDeveloperTips.com/?p=1256#comment-148 You can combine this with the plist based Settings Bundles to do some useful things. For example, I have a toggle switch that will reset the data for our app _once_. The setting is checked at startup and then forced to false. I read somewhere that the defaults get saved periodically, but found that it was best to use [[NSUserDefaults standardUserDefaults] synchronize] to make sure they indeed got flushed. You can combine this with the plist based Settings Bundles to do some useful things. For example, I have a toggle switch that will reset the data for our app _once_. The setting is checked at startup and then forced to false.

I read somewhere that the defaults get saved periodically, but found that it was best to use [[NSUserDefaults standardUserDefaults] synchronize] to make sure they indeed got flushed.

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