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I have several tabs in my interface. One of which displays a map. Another tab should display the same map (same lat, long, region etc), but only in certain circumstances. How would I keep these maps in sync? I guess this could be a more general question about keeping data in sync across several tabs.
Either have a singleton that both tabs can access to store and retrieve data about the map or save it to file, perhaps via NSData. The second option will allow persistence of the data across launches.