iOS AVFoundation: How do I fetch artwork from an mp3 file?

Question

My code:

- (void)metadata {
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:self.fileURL options:nil];

NSArray *artworks = [AVMetadataItem metadataItemsFrom         


        

Answer 1

As Ryan Heitner pointed out in a comment to Andy Weinstein, the way to retrieve the binary artwork data from the AVMetadataKeySpaceID3 has changed somewhere from IOS7 to IOS8. Casting blindly item to NSDictionary will crash in the ID3 case nowadays. To make code bullet proof just check dataValue, otherwise the Classes. In fact today item.value points to item.dataValue and has the NSData class.

- (UIImage*)imageFromItem:(AVMetadataItem*)item
{
  NSData* data=nil;
  if (item.dataValue!=nil) {
    data=item.dataValue;
  } else if ([item.value isKindOfClass:NSData.class]) { //never arrive here nowadays
    data=(NSData*)item.value;
  } else if ([item.value isKindOfClass:NSDictionary.class]) { //never arrive here nowadays...
    NSDictionary* dict=(NSDictionary*)item.value;
    data=dict[@"data"];
  }
  if (data==nil) {
    return nil;
  }
  return [UIImage imageWithData:data];
}