Kas on võimalik, et meetod viewDidAppear käivitub ilma eelneva viewWillAppear kutseta?

In the normal lifecycle of UIViewController, the method viewWillAppear is called before viewDidAppear. However, there are situations where viewDidAppear can execute without a prior call to viewWillAppear:

• If the controller is already on the screen and a repeated call to viewDidAppear occurs (for example, when returning from a modal presentation), but viewWillAppear is not called because the view did not disappear.
• In cases of programming errors or non-standard manipulations of the controller hierarchy.

In the standard scenario, viewWillAppear is always called before viewDidAppear, so if this does not happen, you should check the logic of displaying controllers and their lifecycle.