Question

I’m looking to storing multiple instances of UIControlState within NSUserDefaults on the IOS platform.

Let’s say there is a preference panel with various UIControl elements, be they UISlider, UISwitch etc.

Currently I have a loadPrefs function within viewWillAppear and a corresponding writePrefs within viewWillDisappear.

Rather than adding the code to store the state within NSUserDefaults for any future control that I add, is there an easy way to iterate through all the keys in NSUserDefaults and set the relevant states accordingly?

Is there a “proper” way of doing this via an NSArray or some other collection or is it not worth the time and bother?

Answer 1

You can get the entire NSUserDefaults stuff as an NSDictionary by using the dictionaryRepresentation method:

NSDictionary *dict = [[NSUserDefaults standardUserDefaults] dictionaryRepresentation];
for (NSString *key in [dict allKeys])
{
    // do whatever you want
}

Hope this helps.