Re: CALayer -drawInContext and GCD
Re: CALayer -drawInContext and GCD
- Subject: Re: CALayer -drawInContext and GCD
- From: Chris Parker <email@hidden>
- Date: Thu, 02 Sep 2010 09:40:56 -0700
On 2 Sep 2010, at 8:52 AM, David Duncan wrote:
> On Sep 2, 2010, at 7:39 AM, Vincent Habchi wrote:
>
>> I just wanted to know someone has already tried to successfully send a CALayer -drawInContext method to a GCD dispatch queue. I suspect this is not possible, because of main loop related issue, but this is unclear.
>
> This can be done, but you have to ensure that your layer's drawing is threadsafe. Should be as simple as this with that precondition met:
>
> dispatch_async(queue, ^{
> [layer display];
> [CATransaction flush];
> }
There is (almost) never any reason for anyone to be calling +[CATransaction flush] directly. You'll cause all sorts of unexpected things to happen w.r.t. extant CATransactions. You should let +flush be called at the end of the run loop on its own.
.chris
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