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    <ol> <li><p>The std way would be to check if there is a value in NSUserDefaults and if that value doesn't exist (such as on first run) then create the value so on the rest of the starts you will know its not first run.</p></li> <li><p>This is also a good candidate to use the NSUserDefaults and set key/value pares for each setting/permission you want.</p></li> </ol> <p><a href="http://icodeblog.com/2008/10/03/iphone-programming-tutorial-savingretrieving-data-using-nsuserdefaults/" rel="nofollow noreferrer">Here's a quick tutorial on using NSUserDefaults.</a></p> <p>Summary from that site for Saving:</p> <pre><code>NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; // saving an NSString [prefs setObject:@"TextToSave" forKey:@"keyToLookupString"]; // saving an NSInteger [prefs setInteger:42 forKey:@"integerKey"]; // saving a Double [prefs setDouble:3.1415 forKey:@"doubleKey"]; // saving a Float [prefs setFloat:1.2345678 forKey:@"floatKey"]; // This is suggested to synch prefs, but is not needed (I didn't put it in my tut) [prefs synchronize]; </code></pre> <p>Loading:</p> <pre><code>NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; // getting an NSString NSString *myString = [prefs stringForKey:@"keyToLookupString"]; // getting an NSInteger NSInteger myInt = [prefs integerForKey:@"integerKey"]; // getting an Float float myFloat = [prefs floatForKey:@"floatKey"]; </code></pre> <p>NSUserDefaults is perfect for saving app settings, and purchase history but if you are wanting to store much data then you should use another way. </p>
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    1. COIf I use NSUserDefaults, can the user change these values outside the application? (I mean, editing these values throw the settings icon on iPhone).
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    2. CONo, only your app can change them. Unless they have jail broken their device, then the only real safe place is the keychain, but even that may not be secure. All bets are off on jail broken hardware.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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