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copied!<p>No, you can't assume that. One of my methods looks at two keys, playable and duration, and I have found that playable is often available while duration isn't yet. I therefor have moved the loadValuesAsynchronouslyForKeys: code into a separate method shouldSave:. The shouldSave: method I call from a timer in a method called saveWithDuration:. Once saveWithDuration: receives a non-zero duration, it goes ahead and saves stuff. To avoid waiting too long, I use an attempt counter for now -- in the future, I'll refine this (you'll notice that the error instance isn't really used at the moment) </p> <pre><code>- (void)shouldSave:(NSTimer*)theTimer { NSString * const TBDuration = @"duration"; NSString * const TBPlayable = @"playable"; __block float theDuration = TBZeroDuration; __block NSError *error = nil; NSArray *assetKeys = [NSArray arrayWithObjects:TBDuration, TBPlayable, nil]; [_audioAsset loadValuesAsynchronouslyForKeys:assetKeys completionHandler:^() { AVKeyValueStatus playableStatus = [_audioAsset statusOfValueForKey:TBPlayable error:&error]; switch (playableStatus) { case AVKeyValueStatusLoaded: //go on break; default: return; } AVKeyValueStatus durationStatus = [_audioAsset statusOfValueForKey:TBDuration error:&error]; switch (durationStatus) { case AVKeyValueStatusLoaded: theDuration = CMTimeGetSeconds(_audioAsset.duration); break; default: return; } }]; NSUInteger attempt = [[[theTimer userInfo] objectForKey:TBAttemptKey] integerValue]; attempt++; [self saveWithDuration:theDuration attempt:attempt error:&error]; </code></pre> <p>}</p>

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