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Editorial Team
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Asked: 2026-05-20T03:12:46+00:00

I have an app with a tab bar. Each tab has its own view

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I have an app with a tab bar. Each tab has its own view controller. I also have a mutable array that each tab view controller should be able to access (get the ith element, add a new element, delete an element, etc). Right now, I’m doing an ugly hack, which is passing the array around as I change tabs with using things like this in the viewWillAppear and viewDidDisappear methods:

[[[[self.tabBarController viewControllers] objectAtIndex:2] viewControllers] objectAtIndex:0];

Please can someone enlighten me as to the correct way to do this? I have a feeling I should just keep the array in my appdelegate, but I’m not sure how to access it from the other view controllers if I do that.

Many thanks!

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1 Answer

  1. Editorial Team

    I’m facing a similar issue. After looking around I decided for a singleton which declares the NSMutableArray in its @interface, and then is shared between all the viewControllers.
    I started from this page for the general shape. I’m then passing around calls to set up the values of the array. I’m not still 100% done (see this post of mine) but I think this should be the way. Any other ideas are most than welcome!
    Have a nice day!
    /Luca

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