Re: Question about MPMediaQuery
Re: Question about MPMediaQuery
- Subject: Re: Question about MPMediaQuery
- From: "Eric E. Dolecki" <email@hidden>
- Date: Wed, 06 Jul 2011 11:01:57 -0400
Thanks for your answer - I'll check it out.
Eric
On Wed, Jul 6, 2011 at 10:54 AM, Fritz Anderson <email@hidden> wrote:
> On 6 Jul 2011, at 7:38 AM, Eric E. Dolecki wrote:
>
>> I am wondering if I need to recreate MPMediaQuery each time I want to
>> use it and am changing grouping type and filter predicates... or can I
>> simply create that once and then change filters, etc. on it. Wondering
>> if it would speed my code up.
>
> MPMediaQuery seems to be mutable. You can add and remove filters. The ability to remove filters doesn't make sense to me unless you can reuse the query. I don't know from experience. Maybe if you tried it, and checked for accuracy, leaks, and zombies, you'd know.
>
> But if you're wondering whether it would speed your code up, you can find out for yourself: Have Instruments profile it as-is. If it turns out that the alloc/init of queries takes up a significant part of your execution time (I'd be surprised it it did), then you can try caching instances, and seeing for yourself whether it helps.
>
> Don't waste your time guessing what your app needs. Measure.
>
> — F
>
>
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