objective c - iOS 10.3 MPMusicPlayerControllerQueue -


i'll try modify queue of mpmusicplayer.

at ios 10.3 new functions established, i. e.: 

- (void)performqueuetransaction:(void (^)(mpmusicplayercontrollermutablequeue *queue))queuetransaction completionhandler:(void (^)(mpmusicplayercontrollerqueue *queue, nserror *error))completionhandler;

could explain usage of function? example nice...

thanks in advance...


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