Re: updating NSTextField before spinner animates
Re: updating NSTextField before spinner animates
- Subject: Re: updating NSTextField before spinner animates
- From: sqwarqDev <email@hidden>
- Date: Wed, 12 Nov 2014 15:58:16 +0700
> On 11 Nov 2014, at 23:01, Fritz Anderson <email@hidden> wrote:
> -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.
Thanks for this Fritz. I think I get it. I need to get a clearer idea of how the run loop works. This isn't the first time I've been confused about why a line doesn't appear to return the result I expect before the next line executes. I suppose this is part of the difference between using traditonal procedural languages and these /new-fangled/ object-oriented ones... :~)
I guess I've got some reading up to do! Thanks again.
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