On 13 Jun 2011, at 9:48 AM, mail...@ericgorr.net wrote:
> But, the primary thing I would like to know is whether or not I can make the
> progress bar animate while the while(1){} loop is running inside of the
> drawRect: method of MyClass without using an additional window. While I wrote
> the infinite loop as while(1){}, which would allow me to insert my own code
> into the while loop and may allow the progress indicator to animate, in the
> real case, I do not have the ability to modify the code executing the long
> process.
Absolutely not. drawRect: is for drawing, not for computation. It is supposed
to be as close to immediate as possible. Not only is it bad practice in
isolation, but in some circumstances, the OS may require you to draw your view
in more than one place. Bad.
Factor the long process out of drawRect:. For instance, put it into a separate
thread, and have it send setNeedsDisplay to the view on the main thread. As a
bonus, you can display a progress indicator that actually indicates progress on
a task, and not as a proxy for the spinning inactivity cursor.
— F
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