Few seconds of processing & button events

Hi,
i have a 'theory' question -
some feature of my app has a bit long processing time, about a few seconds, in which there's an activity indicator running.
this processing should start after the user pressed some "start process" button.
my question is -
is it good or bad or neither to do this large processing issue from within the button's event method (the one connected to "TouchUpInside" event for example, or there's a better way to use events to signal other parts of the application to do that processing.
the reason i ask this is when i do the processing from within the buttons event method, the button is highlighted and than remains highlighted until all the process is done.it seems that the highlight is there until the button's event method finished.
i hope i explained myself clearly enough.
thanks a lot.

nkobik wrote:
is it good or bad or neither to do this large processing issue from within the button's event method
The problem in this case isn't which method starts the long process. No matter where you run that task, it's going to freeze the UI until you get it out of the main thread. Running the process in the action method makes the problem more noticeable since the button's state can't change until the process completes, but freezing the UI is never acceptable even if some users don't notice it. I.e. even if the app has nothing useful to do until the long process completes, the controls should still respond normally, if only to pop up an alert asking the user to be patient. Generally the user should also have the opportunity to cancel a long process, which isn't going to be possible with a frozen UI.
So it looks like you need to bite the bullet and use some kind of concurrent operation. I think the choice will depend in part on your experience and preference. If you're comfortable with threaded programming, starting a helper thread to run the long process might be the easiest for you. However the SDK supports higher level concurrency management, and if you're not familiar with the NSOperation classes you might want to look over the Concurrency Programming Guide.
Whatever approach you decide on, let us know if you need help with it, and I'm sure someone around here will be able to advise you.
\- Ray

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Few seconds of processing & button events

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