On 11 Nov 2014, at 4:15 AM, sqwarqDev <sqwarq...@icloud.com> wrote:
> I have an NSTextView, whose string I want to update while I wait for another
> method to complete. Since this method is going to take around 10-30 seconds,
> I'm displaying a spinner progress indicator.
>
> However, I want the text field to update before (and, ideall, during, but
> I'll settle for before) the spinner starts, but no matter where I put the
> text field message, it waits until the spinner has finished before updating.
> I've even tested to make sure the update happens first (see the conditional
> clause below), but the update is not shown in the view until the spinner
> finishes.
>
...
> [_mySpinner startAnimation:nil];
>
> [_infoField setString:@"display something..."];
>
> NSString *didChange = [_infoField string];
> NSRange r = [didChange rangeOfString:@"something"];
> [_infoField needsDisplay];
> if (r.location !=NSNotFound) {
> NSLog(@"hit sleep");
> sleep(5);
> }
> [_mySpinner stopAnimation:nil];
>
>
> Putting the _infoField setString call before the spinner's startAnimation
> call makes no difference. What am I doing wrong?
>
-needsDisplay schedules a view’s -drawRect: for the next pass through the
runloop. You’re putting your process to sleep at the OS level, so the runloop
is suspended along with everything else.
What you posted is evidently a minimal case, and maybe, instead of sleep(),
your lengthy method is called instead. Same principle: Unless that method runs
asynchronously (or simulates asynchrony by doing its work piecewise on an
NSTimer, or by periodically sending -runMode:beforeDate: to the runloop), the
runloop never has the chance to dispatch view updates.
— F
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