Question

I have this in my app delegate applicationDidFinishLaunching method:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if([defaults objectForKey:@"AcceptTC"] == nil){
    NSDictionary *appDefaults = [NSDictionary dictionaryWithObject:@"NO" forKey:@"AcceptTC"];
    [defaults registerDefaults:appDefaults];
}

and I have this in my RootViewController viewDidLoad method:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if(![defaults boolForKey:@"AcceptTC"]){
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Notice" message:@"By using this application you agree to be bound by the Terms and Conditions as stated within this application." delegate:self cancelButtonTitle:@"No Deal" otherButtonTitles:@"I Understand",nil];
    [alert show];
    [alert release];
}

and my alert view delegate does this:

if(buttonIndex == 0){
            exit(0);
        }
        else{
            NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
            [defaults setObject:@"YES" forKey:@"AcceptTC"];
        }

However when I click “I understand” (button index 1) and then restart the application I still see the alert view! Even though I’ve definiely set the value to YES.

I have no idea how to change this. 🙁 I only want it to show the first time a user starts the application – i don’t want to keep showing it every time they want to use it.

Thanks

Answer 1

Concering registerDefaults:

The contents of the registration domain are not written to disk; you need to call this method each time your application starts. You can place a plist file in the application’s Resources directory and call registerDefaults: with the contents that you read in from that file.

// Load default defaults
[[NSUserDefaults standardUserDefaults] registerDefaults:[NSDictionary \
    dictionaryWithContentsOfFile:[[NSBundle mainBundle] \ 
    pathForResource:@"Defaults" ofType:@"plist"]]];

Code taken from this SO answer.

Another blog article about NSDefaults:

• http://retrodreamer.com/blog/2010/07/slight-change-of-plan/