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

Explaining State Transitions in the official doc: https://developer.apple.com/library/ios/documentation/uikit/reference/UIViewController_Class/index.html

This image shows the valid state transitions between various view ‘will’ and ‘did’ callback methods

Valid State Transitions:

^{Taken from: https://developer.apple.com/library/ios/documentation/uikit/reference/UIViewController_Class/Art/UIViewController Class Reference_2x.png}