Re: Prompting user (NSAlert) during document reading
Re: Prompting user (NSAlert) during document reading
- Subject: Re: Prompting user (NSAlert) during document reading
- From: edward taffel <email@hidden>
- Date: Wed, 27 Aug 2014 11:43:01 -0400
On Aug 27, 2014, at 11:30 AM, Matthew LeRoy <email@hidden> wrote:
> This seems to work in initial testing — the alert displays — but I get a message in the console telling me that “NSAlert is being used from a background thread, which is not safe. This is probably going to crash sometimes. …” Presumably this is because I have overridden +canConcurrentlyReadDocumentsOfType: to return YES for my documents, resulting in document reading happening on a background thread. Changing +canConcurrentlyReadDocumentsOfType: to return NO makes the warning message go away.
i had this problem too: you can show the alert on the main thread via e.g. performSelectorOnMainThread. (as was kindly pointed out to me by, if i remember correctly, graham cox).
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