Does initWithHTML:dataUsingEncoding:documentAttributes: run an event loop?
Does initWithHTML:dataUsingEncoding:documentAttributes: run an event loop?
- Subject: Does initWithHTML:dataUsingEncoding:documentAttributes: run an event loop?
- From: Jean Suisse <email@hidden>
- Date: Wed, 15 May 2013 15:58:20 +0200
Thanks for your replies.
Unfortunately, I can't easily avoid initWithHTML:dataUsingEncoding:documentAttributes:
But I can postpone it long enough to move its execution to an other thread (serial dispatch queue).
That solves the issue.
Jean
On 8 mai 2013, at 21:14, Jens Alfke <email@hidden> wrote:
>
> On May 7, 2013, at 3:52 PM, Ken Thomases <email@hidden> wrote:
>
>> Yes, it can. Under the hood, NSAttributedString is using WebKit for HTML rendering. In part that means that, when invoked from a background thread, it has to shunt the work to the main thread. But it also means the main thread may have to run the run loop during the call. It's a nuisance, but it's necessary since HTML can have references to external resources that need to be loaded.
>
> I’ve had trouble with this method in the past, for exactly that reason — you can get weird reentrancy problems from runloop sources like timers being invoked while in the middle of the call. (It’s also pretty slow.)
>
> IMHO it’s best to avoid this method if you can. For example, the last time this came up all I needed was the plain text, so I wrote a little string transformer to strip out HTML tags and expand HTML entities. For more involved work you could use NSXMLParser (with the “tidy” option) to parse the HTML into a DOM and then walk through that.
>
> —Jens
-----------
Jean Suisse
Institut de Chimie Moléculaire de l’Université de Bourgogne
(ICMUB) — UMR 6302
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