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我正在尝试使用以下功能从 DNG 图像中删除元数据：

fileprivate func removeMetadataFromPhotoData(data: Data) -> NSMutableData? {
    
    guard let source = CGImageSourceCreateWithData(data as CFData, nil) else {return nil}
    guard var type = CGImageSourceGetType(source) else {return nil}

    let imageProperties = CGImageSourceCopyPropertiesAtIndex(source, 0, nil) as Dictionary?

    let dngDict = imageProperties?[kCGImagePropertyDNGDictionary]
    var newDNGDict:NSMutableDictionary?

    if let dict = dngDict {
        newDNGDict = editDNGDict(originalDict: dict as! NSMutableDictionary)
    }

    let count = CGImageSourceGetCount(source)
    let mutableData = NSMutableData(data: data)
    guard let destination = CGImageDestinationCreateWithData(mutableData, type, count, nil) else {return nil}
    let properties: NSMutableDictionary = [String(kCGImagePropertyGPSDictionary): kCFNull]

    if let dngDictionary = newDNGDict {
        properties[String(kCGImagePropertyDNGDictionary)] = dngDictionary
    }

    
    print("SOURCE: \(source)")
    
    for i in 0..<count {
        CGImageDestinationAddImageFromSource(destination, source, i, properties as CFDictionary)
    }
    
    guard CGImageDestinationFinalize(destination) else {return nil}
    
    return mutableData
}

print 语句打印 的值source，因此源不是 nil。但是，当执行下一行时，我收到以下错误：

addImageFromSource:2179: 源的图像 0 为零

finalize:2470：图像目标必须至少有一张图像

我对其他格式（JPG、PNG、TIFF 等）执行相同的过程，但它们都没有这个问题。如果有人可以帮助我，我将不胜感激。

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