Looking to understand the iOS UIViewController lifecycle

Question

Could you explain me the correct manner to manage the UIViewController lifecycle?

In particular, I would like to know how to use Initialize

Answer 1

Let's concentrate on methods, which are responsible for the UIViewController's lifecycle:

• Creation:

  - (void)init

  - (void)initWithNibName:

• View creation:

  - (BOOL)isViewLoaded

  - (void)loadView

  - (void)viewDidLoad

  - (UIView *)initWithFrame:(CGRect)frame

  - (UIView *)initWithCoder:(NSCoder *)coder

• Handling of view state changing:

  - (void)viewDidLoad

  - (void)viewWillAppear:(BOOL)animated

  - (void)viewDidAppear:(BOOL)animated

  - (void)viewWillDisappear:(BOOL)animated

  - (void)viewDidDisappear:(BOOL)animated

  - (void)viewDidUnload

• Memory warning handling:

  - (void)didReceiveMemoryWarning

• Deallocation

  - (void)viewDidUnload

  - (void)dealloc

For more information please take a look on UIViewController Class Reference.