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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