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我正在使用 UIImagePickerController 用相机拍照，并从 SavedPhotosAlbum 库中获取照片。用户拍摄照片后，我将其保存在 SavedPhotosAlbum 中，并调用以下方法：

override func image(image: UIImage, didFinishSavingWithError: NSErrorPointer, contextInfo:UnsafePointer<Void>)       {

        if (didFinishSavingWithError != nil) {
            print("Error saving photo: \(didFinishSavingWithError)")
        } else {
            let photoToSend = CompressAndSendPhoto(image: image)
            photoToSend.uploadImageRequest()
            print("Successfully saved photo, will make request to update asset metadata")

            let fetchOptions = PHFetchOptions()
            fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]
            let fetchResult = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: fetchOptions)
            let lastImageAsset = fetchResult.lastObject as! PHAsset
            let coordinate = CLLocationCoordinate2DMake(self.coordinate1, self.coordinate2)
            let nowDate = NSDate()
            let myLocation = CLLocation(coordinate: coordinate, altitude: 0.0, horizontalAccuracy: 1.0, verticalAccuracy: 1.0, timestamp: nowDate)

            PHPhotoLibrary.sharedPhotoLibrary().performChanges({

                let assetChangeRequest = PHAssetChangeRequest(forAsset: lastImageAsset)
                assetChangeRequest.location = myLocation

                }, completionHandler: {
                    (success:Bool, error:NSError?) -> Void in

                    if (success) {
                        print("Succesfully saved metadata to asset")
                        print("location metadata = \(myLocation)")
                    } else {
                        print("Failed to save metadata to asset with error: \(error!)")
                    }
            });
        }
    }

它工作正常，用户当前位置被添加到照片资产中。问题是从 SavedPhotosAlbum 中选择照片时我无法获得此值。我用谷歌搜索了很多选项，但没有一个有效。我怎样才能在下面的方法中做到这一点？

  func imagePickerController(
        picker: UIImagePickerController,
        didFinishPickingMediaWithInfo info: [String : AnyObject])
    {
        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage

            if picker.sourceType == UIImagePickerControllerSourceType.SavedPhotosAlbum {


            } 


        dismissViewControllerAnimated(true, completion: nil)
    }

此外，我想向照片资产添加更多“字段”，不仅是默认位置之一，如何添加自定义 NSDictionary 值？

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