Attach metadata to an image using Photo Framework

Question

I successfully saved the image Photo Libraryusing the Photo Framework APIs after the user selected this image from the library using UIImagePickerController.

As I capture the image inside my application, I have to take care of the metadata. I could save the location and createDate for the newly captured image and save it to the library.

But the problem is that I want to attach a ton of other properties, I want to say that I want to attach properties EXIFand TIFF.

There EXIFare many properties like

kCGImagePropertyExifDateTimeOriginal kCGImagePropertyExifMaxApertureValue kCGImagePropertyExifSpatialFrequencyResponse kCGImagePropertyExifLensModel

How can I get these values ​​from the current device and attach it to the image and save it to Photo Library?

Here is the complete code that I use to save the image in Photo Libraryafter removing it from UIImagePickerController. I would like to add metadata line bindings somewhere in this function before storing them in Photo Library.

//MARK: Saving an Image to PhotoLibrary and taking back the PHAsset

    class func savingThis(image : UIImage, completion : (asset : PHAsset?) -> ())
    {
        var localIdentifier : String?
        let imageManager = PHPhotoLibrary.sharedPhotoLibrary()

        imageManager.performChanges({ () -> Void in

            let request = PHAssetChangeRequest.creationRequestForAssetFromImage(image)

            request.location = LocationManager.sharedInstance.locationManager.location
            request.creationDate = NSDate()

            // Add more properties here - somewhere EXIF, TIFF....

            if let properAsset = request.placeholderForCreatedAsset {
                localIdentifier = properAsset.localIdentifier
            }
            else {
                completion(asset: nil)
            }

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

                if let properLocalIdentifier = localIdentifier {

                    let result = PHAsset.fetchAssetsWithLocalIdentifiers([properLocalIdentifier], options: nil)

                    if result.count > 0   {
                        completion(asset: result[0] as? PHAsset)
                    }
                    else {
                        completion(asset: nil)
                    }
                }
                else {
                    completion(asset: nil)
                }
        })
    }

This is a stupid question? I do not need to use the Photos Framework, if there is another way to attach the metadata, in any way, I just want to attach it. I dont know. Let me know your suggestions?