How many times does viewDidLoad get called?

viewDidLoad() is one of the initialization methods that is called on the initial view controller. viewDidLoad() is called before anything is shown to the user – and it is called only once.

Is viewWillAppear called after viewDidLoad?

viewWillAppear(_:) Always called after viewDidLoad (for obvious reasons, if you think about it), and just before the view appears on the screen to the user, viewWillAppear is called.

Which is called first viewDidLoad or viewDidAppear?

viewDidLoad is called once when the controller is created and viewDidAppear is called each time the view, well, DID appear. So say you have a modal view that you present, when that view is dismissed, viewDidAppear will be called, and viewDidLoad will not be called.

What is viewDidLoad in Swift?

viewDidLoad is called when the ViewController has loaded its view hierarchy into memory. This is the point where you can perform your customized initialisation for your view controller. For instance, if your view controller has a UILabel and you want to set a custom text to it, this is the point where you do that.

What is the difference between viewDidLoad and viewWillAppear?

viewDidLoad ONLY gets called when the view is constructed – so for example after a view controller initFromNibNamed call when the view is accessed. viewWillAppear is called anytime your view controller was not in view but comes into view – so when your view controller is pushed, viewWillAppear is called.

Which method is called before viewDidLoad?

Yes, viewDidLoad method is called before viewDidAppear:. viewDidLoad and viewDidLoad: mean actually different things. You specify : if it has an argument, but viewDidLoad does not, just as a convention.

What is the difference between viewDidLoad () and viewDidAppear ()?

The difference between viewDidAppear and viewDidLoad is that viewDidAppear is called every time you land on the screen while viewDidLoad is only called once which is when the app loads.

Should I call super viewDidLayoutSubviews?

And You don’t need to call a super. viewDidLayoutSubviews because the default implementation does nothing. Apple Document: When the bounds change for a view controller’s view, the view adjusts the positions of its subviews and then the system calls this method.

Which method is called first in viewController?

The view controller calls its loadView method.

Should I call super viewDidAppear?

Not calling [super viewDidAppear] is indeed a bad idea. The base class for UIViewController has code in viewDidAppear that needs to be called or things won’t work correctly.