Here's a small snippet from the docs for UIDocument's openWithCompletionHandler:
Parameters
completionHandler
A block with code to execute after the open operation concludes. The
block returns no value and has one parameter:
success
YES if the open operation succeeds, otherwise NO.
The block is invoked on the main queue.
I have a subclass of UIDocument, this is my openWithCompletionHandler override,
I need to cache something at the point the document is opened and closed ..
-(void)openWithCompletionHandler:(void (^)(BOOL))completionHandler
{
// after the open, recalcuate the topic
[ super openWithCompletionHandler:^(BOOL success){
[ self cacheTopic ];
if( completionHandler )
completionHandler( success ); // <-- I'm here
} ];
}
I'm in the debugger right now at the 'completionHander( success )' call and I'm
on Thread 11. That is not the main thread, harder to show but if I type this
into LLDB ..
(lldb) p (BOOL)[ NSThread isMainThread ]
(BOOL) $2 = NO
(lldb)
Is there something entirely braindead I am missing here or should I be on the
main queue and thus on the main thread if the documentation is correct?
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