升级到优胜美地对objectForKey MP3形象造成负面影响

Question

刚刚更新到优胜美地的Xcode和6.0.01这个代码将不再有效：

- (NSImage *)songImage { 
    if (!_songImage) { 
     AVAsset *asset = [AVAsset assetWithURL:self.fileURL]; 
     for (AVMetadataItem *metadataItem in asset.commonMetadata) { 
      if ([metadataItem.commonKey isEqualToString:@"artwork"]){ 
       NSDictionary *imageDataDictionary = 
        (NSDictionary *)metadataItem.value; 
       NSData *imageData = [imageDataDictionary objectForKey:@"data"]; 
       _songImage =[[NSImage alloc] initWithData:imageData]; 
      } 
     } 
    } 
    if (!_songImage) { 
     return Nil; 
    } 

    return _songImage; 
} 

我不知道如果这个过程被替换或删除，但我现在得到一条消息：

2014-10-17 14:36:23.756 FSC Music[3317:122917] -[__NSCFData objectForKey:]: unrecognized 
    selector sent to instance 0x600000241cb0 2014-10-17 14:36:23.764 
FSC Music[3317:122917] -[__NSCFData objectForKey:]: unrecognized selector sent to instance 
    0x600000241cb0 

需要研究一个解决方案，但想问问是否有其他人遇到过这个？

Answer 1

我更改为以下代码以使其再次运行。

-(NSImage *)songImage { 

    if (!_songImage) { 
     AVAsset *asset = [AVAsset assetWithURL:self.fileURL]; 
     NSArray *metadata = [asset commonMetadata]; 
     for (AVMetadataItem *item in metadata) { 
      if ([item.commonKey isEqualToString:@"artwork"]){ 

       NSData *thePix = (NSData *)item.value; 

       _songImage =[[NSImage alloc] initWithData:thePix]; 
      } 
     } 
    } 
    if (!_songImage) { 
     return Nil; 
    } 

    return _songImage; 
}