Since the set of settings is inside your application package, you cannot change it at run time, only at compile time.
You can, however, use NSUserDefaults to set the value at runtime, and the settings application will automatically reflect this. However, this will be saved elsewhere. You can simply read it in the same way as with a set of settings, also through NSUserDefaults .
Please note that you should not read directly from the parameter set, as this does not make sense. You should always select and set custom defaults using NSUserDefaults . When the user makes changes to the settings application, NSUserDefaults will reflect this automatically. They will always be synchronized.
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