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I have created a drop down banner system, like GameKits (When you get an achievement for example).

I can easily display the banner in one view with the code below. However, all my server code is stored in a singleton class, and would like to notify the user when something happens in there (regardless what view controller they are in). How would I go about doing this?

[self displayBannerWithTitle: @"title here"]; 

Thanks in advance

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I found a answer like this: Passing Data between View Controllers
In your case it's passing data to and from (The second part of the question.)

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