iphone - AVURLAsset - loadValuesAsynchronouslyForKeys:requestedKeys -

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i'm using code load values of key , play movie url. 

[asset loadvaluesasynchronouslyforkeys:requestedkeys completionhandler:      ^{                            dispatch_async( dispatch_get_main_queue(),                          ^{                                                                                       [self preparetoplayasset:asset withkeys:requestedkeys];                         });      }];

but method preparetoplayasset cannot run , don't know why. know reason?


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