What is viewWillDisappear?

viewWillDisappear() Called when the view controller’s view is about to be removed from the view hierarchy in the window.

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.

When can I call super viewWillDisappear?

[Means the order is of importance.] viewWillAppear, viewDidAppear, viewWillDisappear, viewDidDisappear: If you override this method, you must call super at some point in your implementation. [Means the order is of no importance.]

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.

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.

When should I call super?

In your example, when you are being notified that a view will appear, you might want to let the super do its thing, and then, after that, take care of whatever your subclass view needs to do. But it could conceivably be other way around, or you could call the super method in between your code.

What is difference between viewWillAppear and viewDidAppear?

As the name suggests the viewWillAppear is called before the view is about to appear and viewDidAppear is called when view did appear.

What 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. Loaded in memory means ready to use/display. Follow this answer to receive notifications.

What comes first viewDidLoad or viewWillAppear?

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.

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

What is First Responder UIKit?

The first responder is whatever control is currently ready to respond to actions. In UIKit this is usually the control that has activated the keyboard and is receiving input.

Can you explain the responder chain?

The responder chain allows responder objects to transfer responsibility for handling an event or action message to other objects in the application. If an object in the responder chain cannot handle the event or action, it resends the message to the next responder in the chain.

What is super method?

Definition and Usage The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.