Asynchronously performs a given block on the receiver’s queue.
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- (void)performBlock:(void (^)(void))block;
The block to perform.
You use this method to send messages to managed objects if the context was initialized using NSPrivateQueueConcurrencyType or NSMainQueueConcurrencyType.
This method encapsulates an autorelease pool and a call to processPendingChanges.
Synchronously performs a given block on the receiver’s queue.