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Editorial Team
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Asked: 2026-05-16T15:47:31+00:00

When/why/how would you use these methods? – navigationController:willShowViewController:animated: – navigationController:didShowViewController:animated: Can’t you just use

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When/why/how would you use these methods?

- navigationController:willShowViewController:animated:
– navigationController:didShowViewController:animated:

Can’t you just use these UIViewController Instance Methods instead?

– viewWillAppear:
– viewDidAppear:
– viewWillDisappear:
– viewDidDisappear:
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1 Answer

  1. Editorial Team

    You’d use the first ones if you want to be informed about these events outside the visible view controllers. The delegates allow you to get a notification at a single point. Using UIViewController‘s methods bind you within these controllers, where you’d have to write/call same code multiple times to achieve the same.

    Generally you’d divide tasks into these two groups:

    • Things that happen across all view controllers: use the delegates
    • Things happening within a single view controller: use the instance methods
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