About viewController's “viewDidLoad” and “viewWillAppear” methods

Question

I\'ve got a question regarding the two mentioned methods, since in my tests I don´t make clear the order they are called. I thought that, firstly, viewDidLoad i

Answer 1

I thought that, firstly, viewDidLoad is called when the viewController is loaded for first time (as the name indicates), and inmediately after the init method

No. The name indicates that the controller's view has been loaded (not the controller itself). Actually the docs state that this method will get called after the view hierarchy has been loaded into memory (either via loadView or through a nib for example).

Then, I thought that once viewDidLoad returns, viewWillAppear is called

Again, no. loadView (and as a consequence viewDidLoad) method will get called the first time that view property is to be accessed and is nil (which is the case when you're initializing a controller). Think of this simple scenario:

MyViewController *vc = [[MyViewController alloc] init];
UIView *view = vc.view; // <= loadView & viewDidLoad will fire but it certainly didn't appear...

However, while developing I make the impression that there is no order when calling viewDidLoad and viewWillAppear...

Well there is an order. We know for sure that viewWillAppear will always be called after viewDidLoad (if both of them are to be called of course).