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copied!<p>Answered my own question: You can indeed use the NSUserDefaults for saving your own applications preferences without having to integrate with the system settings.</p> <p>For example, my app is a Utility app with a small UI for a couple of settings on the FlipSide (the view the user gets to when pressing the "i" button).</p> <p>Note that I found this information from two sources.</p> <ol> <li><p>In a great series of reports from iPhone BootCamp, Scott Leberknight mentions in passing that he was taught that an applications user-defaults may or may not integrate in the settings app.</p></li> <li><p>The Sample code from the iphone official developer page for the BubbleLevel uses preferences for storing the calibration of the level (which is set on the flipside view)</p></li> </ol> <p>Here are the methods in LevelAppDelegate.m that load the preference when the application starts, and saves it when it terminates:</p> <pre><code>// Invoked after the application has been launched and initialized but before it has received its first event. - (void)applicationDidFinishLaunching:(UIApplication *)application { // Set up the level view controller levelViewController = [[LevelViewController alloc] init]; [window addSubview:levelViewController.view]; // Restore calibration for device float restoredOffset = [[NSUserDefaults standardUserDefaults] floatForKey:BubbleLevelCalibrationOffsetKey]; levelViewController.calibrationOffset = restoredOffset; } // Invoked immediately before the application terminates. - (void)applicationWillTerminate:(UIApplication *)application { float calibrationOffset = levelViewController.calibrationOffset; NSNumber *offset = [NSNumber numberWithFloat:calibrationOffset]; [[NSUserDefaults standardUserDefaults] setObject:offset forKey:BubbleLevelCalibrationOffsetKey]; } </code></pre> <p>I guess, however, that the proper answer to the original question is:</p> <ol> <li><p>No - you can't launch the settings UI from your own app (I haven't seen any way to do this - could be wrong I guess - but I'm pretty sure that even if you could launch Settings from your app, say the way a URL can be used to launch Safari - you wouldn't be able to <em>return</em> to your app from the Settings app, which would defeat the purpose).</p></li> <li><p>For preference-level persistence (as opposed to app data persisted in documents, database or cache) you have 2 choices i) use the system Settings app for your editing ii) create your own controls in your app</p></li> </ol> <p>In either case you can use the NSUserDefaults for the actual persistence.</p>

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