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It may sometimes be useful to show a one time reminder to your user in your application. This might be asking for a iTunes review, additions to social networks or any other task that It may be rude to ask more than once.

That is exactly what I have put into my application SavingsGoal, with a single time popup in the about screen. This is shown in detail in the example below:

First in viewDidLoad(), I have a reference to the firstViewSocialPopup class.

- (void)viewDidLoad {
[super viewDidLoad];
        
        //Internet Links
        websiteURL = @“http://apps.duivesteyn.net“;
        supportEmail = @“apps@duivesteyn.net“;
        facebookURL = @“http://www.facebook.com/apps/application.php?id=107880612574963“;
        twitterURL = @“de_applications”;
        
        [self firstViewSocialPopup];
}

in my .h header file, I have of course added:

-(void)firstViewSocialPopup;

Back in the .m file class I have the method firstViewSocialPopup, which is just checking a NSUserDefaults setting and displaying a UIAlert.

-(void)firstViewSocialPopup{
        NSString *socialPopup = [NSString stringWithFormat:@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@”toggle_social”]];
        NSLog(@”Social Reminder Status: %@”,socialPopup);
        
        if ([socialPopup isEqualToString: @"YES"]) {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@”Social Networking” message:@”Would you help the development team by adding them on Social Networks?” delegate:self cancelButtonTitle:@”No Thanks” otherButtonTitles:@”Twitter”,@”Facebook”,nil];
                [alert show];
                NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
                [defaults setObject:@"NO" forKey:@"toggle_social"];
        }
        
}

THe UIAlert has delegate self and so sends the button pressed to the UIAlertView delegate (which is its self). This will call the class: (void)alertView: (UIAlertView *)alertView clickedButtonAtIndex: (NSInteger)buttonIndex

And so, in the same class (.m file) I have the following method:

- (void)alertView: (UIAlertView *)alertView clickedButtonAtIndex: (NSInteger)buttonIndex
{
        NSLog(@“in alertView action, buttonIndex: %u”,buttonIndex);
        
        if (buttonIndex==1) {
                NSLog(@“Open Twitter”);

                //Custom Open Twitter Page Code
                deHelpers *dehelper = [[deHelpers alloc] init];
                [dehelper openTwitterAppForFollowingUser:@“de_applications"];
                
        } else if (buttonIndex==2) {
                NSLog(@“Open Facebook”);
                
                //Custom Open Twitter Page Code
                url = [NSURL URLWithString:@“http://www.facebook.com/apps/application.php?id=107880612574963"];
                
                NSURLRequest *request = [NSURLRequest requestWithURL:url];
                PWWebViewController *webController = [[PWWebViewController alloc] initWithRequest:request];
                
                UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:webController];
                UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                                                                                                         target:self
                                                                                                                                                                         action:@selector(dismissModal)];
                webController.navigationItem.leftBarButtonItem = cancelButton;
                [cancelButton release];
                [self presentModalViewController:navigationController animated:YES];
                [navigationController release];
                
        }
        
}

Hopefully, you can see the idea, its quite simple. I have included some extra parts in the code for those who are interested exactly how I implement the popup actions. Its using a previously discussed control: PWWebViewController and some DrTouch code: openTwitterAppForFollowingUser.