如何在使用DKImagePickerController时获取带有exif数据的图像？

import DKImagePickerController
import Photos

// 1. 导入DKImagePickerController库

// 2. 设置DKImagePickerController的配置项
let pickerController = DKImagePickerController.defaultImagePickerController()
pickerController.assetType = .allPhotos

// 3. 设置获取图像的回调方法
pickerController.didSelectAssets = { (assets: [DKAsset]) in
    for asset in assets {
        // 4. 获取图像的exif数据
        asset.requestContentEditingInput(with: nil, options: nil) { (contentEditingInput, _) in
            if let imageURL = contentEditingInput?.fullSizeImageURL {
                let imageSource = CGImageSourceCreateWithURL(imageURL as CFURL, nil)
                if let properties = CGImageSourceCopyPropertiesAtIndex(imageSource!, 0, nil) as? [String: Any] {
                    if let exifData = properties[kCGImagePropertyExifDictionary as String] as? [String: Any] {
                        // 在这里可以使用exifData，进行进一步的处理
                        print(exifData)
                    }
                }
            }
        }
    }
}

// 在需要打开图像选择器的地方，调用pickerController.present()方法来打开图像选择器