How to save variables after application shut down?

You should store and load data from NSUserDefaults:

http://developer.apple.com/library/IOS/#documentation/Cocoa/Reference/Foundation/Classes/NSUserDefaults_Class/Reference/Reference.html

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];// to store[defaults setObject:[NSNumber numberWithInt:12345] forKey:@"myKey"];[defaults synchronize];// to loadNSNumber *aNumber = [defaults objectForKey:@"myKey"];NSInteger anInt = [aNumber intValue];

Check out the NSUserDefaults documentation. You can set arbitrary key-value pairs there which (as long as you call the shared user defaults object’s -synchronize at some point before your app terminates) will persist between launches.

You can save them in the NSUserDefaults. This is mainly used for preferences.

[[NSUserDefaults standardUserDefaults] setObject:someInteger forKey:@"someIntegerKey"];[[NSUserDefaults standardUserDefaults] synchronize];

You can also save them to a Property List file if you have more data you'd like to store.

NSDictionary *someDictionary = [NSDictionary dictionaryWithObjectsAndKeys:someInt1, @"someIntKey1", someInt2, @"someIntKey2", nil];[someDictionary writeToFile:somePath error:&error];

To save upon exiting the app place any code in

- (void)applicationWillTerminate:(UIApplication *)application