Question

a tab bar based app with 5 tabs switching option…how i am suppose to manage memory efficiently?

switching between tab are very frequent i am how to manage this scenario?

or

all tab will remain active no matter what? but thats a bad option…

please describe in detail regarding tab bar memory management

Answer 1

Let UIKit handle it. You shouldn’t worry. UIKit will unload views as it sees fit (and you get told about that in viewDidUnload of your view controllers).

So for instance:

1. You start on tab 1. Tab 1 is the only view controller whose view will be loaded.

2. You tap on tab 2. Now tab 2’s view controller will be loaded and tab 1’s view controller is still around.

3. More time goes on, you tap on other tabs which loads other view controllers.

4. UIKit notices that memory is running a bit low or it just wants a bit of a tidy up (you have no control over this). So now it will go and unload some of the view controllers’ views (but obviously never the one you’re currently viewing).

You should of course be a good citizen and release anything you hold onto in your view controller in viewDidUnload that you can easily create again when the view wants to be loaded again.