iOS: Use a boolean in NSUserDefaults

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You can set your boolean by using:

[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"logged_in"];
[[NSUserDefaults standardUserDefaults] synchronize];

and read it by using this code:

if(![[NSUserDefaults standardUserDefaults] boolForKey:@"logged_in"]) {
    [self displayLogin];
} else {
    [self displayMainScreen];
}

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