objective c - AVURLAsset loadValuesAsynchronouslyForKeys: completionHandler: never fires on device -

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I'm using the next snippet to load, values ​​are synchronously, so loading = no fire ever No. And I have the same problem with the AVAssetExportSession export. Simultaneously This is not all just working on the device. 

  NSDictionary * options = [Object with NSDictionary dictionary: [NSNumber Number Witbools: Yes] Key: AVURLASETPreferPreciseDurationAndTimingKey]; AVURLAsset * asset = [AVURLASET URLServerValid URL: URL options: options]; NSArray * key = [NSArray arrayWithObjects: @ "duration", @ "track", zero]; __block Bull loading = yes; [Asset Load ValueExcinronusForcases: Keys Whole Handler: ^ (Zero) {Loading = No; }]; While (loading) [[NSRunLoop currentRunLoop] Run-upDate: [[NSDate date] dateByAddingTimeInterval: 0.5]];   
 Please, help! My brain is melting.   
 
 
 Here's the code I use:  
  NSDRAEL * URL = [NSUr file URLTHath Path: [[NSBindal Mainbundal] PathForreresource: @ "Intro" type type: @ "M4V"]]; Self.asset = [[AVURLAsset alloc] initWithURL: url option: zero]; NSString * tracksKey = @ "tracks"; [Self.asset loadValuesAsynchronouslyForKeys: [NSArray arrayWithObject: tracksKey] completionHandler: ^ {// Other code for AVPlayer here}};   
 I do not use any options or anything of that nature. I'm sure you saw an example of Apple's documentation:

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