What is the difference between viewDidLoad and viewWillAppear?
viewDidLoad: Whatever processing you have that needs to be done once. viewWilLAppear: Whatever processing that needs to change every time the page is loaded.
Does viewDidLoad or viewWillAppear come first?
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 viewDidLoad Objective C?
Discussion. This method is called after the view controller has loaded its view hierarchy into memory. This method is called regardless of whether the view hierarchy was loaded from a nib file or created programmatically in the loadView() method.
Is viewDidLoad only called once?
-viewDidLoad will be called once whenever the view controller needs to load its view hierarchy. Obviously, that’ll happen the first time that the controller accesses its view. If the view controller later unloads its view, then -viewDidLoad will be called again the next time the view is loaded.
What is viewDidLoad?
viewDidLoad is the method that is called once the MainView of a ViewController has been loaded. This is called after loadView is called.In the image you can see the MainView and other views within it.
What is iOS viewWillAppear?
Notifies the view controller that its view is about to be added to a view hierarchy.
What is the opposite of viewDidLoad?
viewWillAppear(_:) Unlike viewDidLoad , viewWillAppear is called the first time the view is displayed as well as when the view is displayed again, so it can be called multiple times during the life of the view controller object.
Why is viewDidLoad not called?
The only modification in the AppController is removing those lines, because the “loadView” is called automatically the first time the “view” property is used. And the “viewDidLoad” is called as expected….viewDidLoad not called.
| Status: | Closed |
|---|---|
| Due date: | |
| Assignee: | – |
| % Done: | 0% |
| Category: | ios |
What is the difference between loadView and viewDidLoad?
loadView is the method that actually sets up your view (sets up all the outlets, including self. view). viewDidLoad you can figure out by its name. It’s a delegate method called after the view has been loaded (all the outlets have been set) that just notifies the controller that it can now start using the outlets.
When can I call super viewDidLoad?
If it’s empty than calling super. viewDidLoad() won’t do much. However if it has some functionality regarding the view controller then you certainly would want to use it. When inheriting directly from UIViewController , call super when its documentation tells you to.
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 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. It is called after view appeared.