Add UIActivityIndicatorView into UIBarButton

Question

How do I add a UIActivityIndicatorView spinner circle into a UIBarButton? So that when a user taps on one of those buttons on the navigation bar, they see a spinner while the loading takes place?

Thanks.

Answer 1

UIActivityIndicatorView is a type of view. Set its frame to be within your button and use -addSubview to add it to the view hierarchy of the UIBarButton.

I'm oversimplifying, since you have to try to make it fit the space (possibly by scaling) and center it...

Answer 2

pseudocode, i'm not going to check this in Xcode, but something like this should work:

UIActivityIndicatorView *act = [[UIActivityIndicatorView alloc] init];
act.frame = CGMakeRect(3,3,25,25);
[myBarButton addSubview:act];
[act release];

Answer 3

Actually activity indicator is not added as toolbar item. It's a subview of current view.

    UIActivityIndicatorView *act = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    [act setCenter:CGPointMake(20, 20)];
    [act startAnimating];
    [self.view addSubview:act];

Remember to release it in -(void)dealloc.