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Editorial Team
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Asked: 2026-06-01T21:47:17+00:00

I have a basic modal view system. My app loads the UI base in

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I have a basic modal view system.

My app loads the UI base in which there are 2 buttons presenting 2 other views.
In those views, a dismiss button.

Everything works fine.

BUT, in one of the 2 modal views, I have a bunch of UISlider & UISwitch.
I want them to retain their values but the dismiss loses them: as soon as I trigger the button to show the view containing the UI elements, this view is shown with all values for all elements as I put initially in the xib.

should I store all values in variables, then in viewWillAppear I could “recall” them ?

would you advice me another strategy ?

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1 Answer

  1. Editorial Team

    Yes, your proposed approach is exactly the right sort of thing. But be careful; viewWillAppear can be called for many reasons; make sure you’re only doing this when the view controller is coming into existence and showing the view for the first time.

    NSUserDefaults can be an excellent place to store globally needed info like this. In viewWillDisappear, store the desired state info (values of the sliders and switches) in defaults. Then retrieve them the next time the view is about to appear.

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