Updating UIView when selected in TabBar

[Eric Chan]

So viewDidLoad only runs once and I cant refresh my groceries list (on
tab bar) when I change something on the Menu. I also tried putting a
[table reloadData] in viewWillAppear but apparently that doesn't get
called either when you changed tabs.

Does anyone know what gets called when the user changes tabs from the
tab bar?

-- Eric

[DavidK]

I used viewDidAppear and it worked fine.

[Gregory Schmidt]

viewWillAppear seems to get called when changing tabs. using NSLog
inside of viewWillAppear shows that. perhaps you aren't updating the
groceries list properly while in the other view?

[Nathan Nichols]

Eric,

-viewWillAppear should be getting called. Don't forget (I frequently
do) that it takes a BOOL parameter. So you have to declare it like

-(void)viewWillAppear:(BOOL)animated

or it will never get called.

Under the covers, the tab bar controller is doing something like:

if ([newViewController
respondsToSelector(@selector(viewWillAppear:))]) {
[newViewController viewWillAppear:animated];
}

If you forget the parameter, your viewController responds to
@selector(viewWillAppear) but not @selector(viewWillAppear:), so it
won't be called.

Nate

[Eric Chan]

That fixed it. Thanks.

The problem was that I did not declare my viewWillAppear with a BOOL
parameter and although that did not return an error, it did not get
called ever.