Does the viewdidload method get called before the view appear?

Question

I've started learning IOS, I'm wondering does the viewdidload: method get called before the view appears on screen? The apple developer guide says this method gets called after the view is loaded into memory but I don't understand What "loaded into memory" means, does it mean the view doesn't appear on screen?

possible duplicate of [iPhone: What gets called after viewDidLoad before viewWillAppear?](http://stackoverflow.com/questions/6821067/iphone-what-gets-called-after-viewdidload-before-viewwillappear) — memmons, Aug 12 '14 at 18:21
yes, please refer view controller life cycle https://stackoverflow.com/questions/5562938/looking-to-understand-the-ios-uiviewcontroller-lifecycle — pransi_k, Jul 31 '17 at 12:12

score 18 · Answer 1 · edited May 23 '17 at 10:31

Does the viewdidload method get called before the view appears?

Yes.

Borrowed from this answer, view controller delegate method order is:

- (void)loadView;
- (void)viewDidLoad;
- (void)viewWillAppear;
- (void)viewDidAppear;

What "loaded into memory" means?

It means when the object (view) is created. It is possible to create and show a view virtually at the same time. However, technically viewDidLoad will be called first.

ppalancica · Answer 2 · 2014-08-12T18:18:32.283

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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.

edited Aug 12 '14 at 18:18

answered Aug 12 '14 at 17:10

ppalancica

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I don't type viewdidload: ,the moderator has modified.Thanks! – hello_java Aug 12 '14 at 17:16

score 0 · Answer 3 · edited May 23 '17 at 12:34

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Yes, it is called before. ViewDidAppear - it is called when the view is visible to the user, here is the place to start an animation or something like that.

More information about the view controller lifecycle: https://stackoverflow.com/a/5570363/3482000

edited May 23 '17 at 12:34

Community

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answered Aug 12 '14 at 17:11

Sandro Machado

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score 0 · Answer 4 · answered Aug 12 '14 at 17:29

Yes viewdidload: is called before viewWillAppear:. and The apple developer guide says this method gets called after the view is loaded into memory means, The viewController in storyboard/XIB is loading into device memory. Other way we can say the user interface which i design into XIB or storyboard is loding into memory...

Does the viewdidload method get called before the view appear?

4 Answers4