Understood, thanks.
Luca.
On Jan 15, 2013, at 4:31 PM, Uli Kusterer <witness.of.teacht...@gmx.net> wrote:
> On Jan 15, 2013, at 3:18 PM, Luca Ciciriello <luca_cicirie...@hotmail.com>
> wrote:
>> I use an activity indicator in order to show, in my UIViewController, a
>> "work in progress" activity.
>>
>> here my code
>>
>> - (void)myMethod
>> {
>> [[self activityElab] setHidden:NO];
>> [[self activityElab] startAnimating];
>>
>> // here I call a very CPU-intensive method.
>>
>> [[self activityElab] setHidden:YES];
>> [[self activityElab] stopAnimating];
>> }
>>
>> My problem is that nothing appear (activity indicator) when myMethod is
>> called. Now if I remove (comment) the call to my "intensive activity" method
>> all is working fine.
>>
>> Any idea? I've tested this code both on the simulator and on a device (iPad)
>> with iOS 5.0 and iOS 6.0
>> My environment is Xcode 4.5.2 on OS X 10.8.2.
>
>
> That won't work. Views are only redrawn once your method returns. So while
> your activity indicator is shown and hidden, nobody will ever see it. If you
> do activities that take a long time, you'd better split them up into smaller
> NSOperations which let the main thread redraw the UI in between each
> operation. Or if you have to, use a separate thread, but that's hard to get
> right, and easy to get wrong in a way that causes random hard-to-find crashes.
>
> Cheers,
> -- Uli Kusterer
> "The Witnesses of TeachText are everywhere..."
> http://www.zathras.de
>
>
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