creating in-app settings for iPad applications

I want to create in-app settin开发者_运维技巧gs for my iPad application. There are different alerts for different groups, so the user can select which alerts he/she wants in the application. I am putting a custom button which will look like checkbox so when user will click it, it will be highlighted.

Can anyone tell me where can I store the settings, do I need to save settings in keychain or somewhere else? Is there any tutorial for doing that?

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I've found NSUserDefaults very helpful for stuff like this. Basically you do this to store values:

NSUserDefaults* defaults= [NSUserDefaults standardUserDefaults];
[defaults setBool:yourBool forKey:@"yourBoolKey"];
[defaults setInteger:yourInteger forKey:@"yourIntegerKey"];
[defaults synchronize];

And to get values:

NSUserDefaults* defaults= [NSUserDefaults standardUserDefaults];
yourBool= [defaults boolForKey:@"yourBoolKey"];
yourInteger= [defaults integerForKey:@"yourIntegerKey"];

To have default settings when the app first launches, you could just check a bool with the key @"AppHasStoredSettings" or something like that, which will be NO the first time, set your default settings, and then set it to YES.

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The best thing would probably be a plist, which, in reality is a structured XML file with keys and values, but Apple abstracts most of that for you pretty well with some nice settings tools. Here's a few things to peruse to get a handle on the idea:

• NSUserDefaults
• User Defaults Programming Topics
• Information about property list files

Luke put some helpful code, but look at these too for more examples and ways to use all the tools available.