Why is viewWillAppear not called?

Why is viewWillAppear not called?

The Simple Answer The technical reason for when viewWillAppear gets called is simple. Notifies the view controller that its view is about to be added to a view hierarchy. It can’t be any view hierarchy — it has to be the one with a UIWindow at the root (not necessarily the visible window).

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.

Can I call viewDidLoad?

You’re not supposed to call it. A better place might be viewDidAppear:, but actually since you already have a protocol in place for communication, the best place is to use that protocol to convey that something changed. The first view will then be responsible for updating itself when it receives that protocol message.

What is view did appear?

viewDidAppear() Called when the view controller’s view is fully transitioned onto the screen.

How many times is viewDidAppear called?

viewDidLoad is called after your view is loaded. It is called only once when view is initialized and pushed or presented. viewDidAppear is called once you see the loaded view on screen.

How many times is viewWillAppear called?

2 Answers. Whenever You push a viewController, It will call viewDidLoad then viewWillAppear and last viewDidAppear. But if you are coming back to viewController only viewWillAppear and viewDidAppear will call.

Which is called first viewDidLoad or viewWillAppear?

viewDidLoad is things you have to do once, you should do things that you only have to do once in viewDidLoad – like setting your UILabel texts. viewWillAppear is called just before the view is displayed. This happens always after viewDidLoad and is called every time the view is displayed.

What is called after viewDidAppear?

viewDidAppear is called once you see the loaded view on screen. It is called after view appeared. ViewDidAppear is called everytime when you see the view after it is loaded.