Getting URL of UIImage selected from UIImagePickerController

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
//this block of code grabs the path of the file   
let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
let imagePath =  imageURL.path!
let localPath = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(imagePath)

 //this block of code adds data to the above path
 let path = localPath.relativePath!
 let imageName = info[UIImagePickerControllerOriginalImage] as UIImage
 let data = UIImagePNGRepresentation(imageName)
 data?.writeToFile(imagePath, atomically: true)

//this block grabs the NSURL so you can use it in CKASSET
 let photoURL = NSURL(fileURLWithPath: path)
 }

In SWIFT 4 u Can Try This, It's working properly.

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {


    if let imgUrl = info[UIImagePickerControllerImageURL] as? URL{
        let imgName = imgUrl.lastPathComponent
        let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
        let localPath = documentDirectory?.appending(imgName)

        let image = info[UIImagePickerControllerOriginalImage] as! UIImage
        let data = UIImagePNGRepresentation(image)! as NSData
        data.write(toFile: localPath!, atomically: true)
        //let imageData = NSData(contentsOfFile: localPath!)!
        let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
        print(photoURL)

    }

    APPDEL.window?.rootViewController?.dismiss(animated: true, completion: nil)
}

For Swift 5+ ;according to @Jaydip answer

if let imgUrl = info[UIImagePickerController.InfoKey.imageURL] as? URL{
        let imgName = imgUrl.lastPathComponent
        let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
        let localPath = documentDirectory?.appending(imgName)

        let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
        let data = image.pngData()! as NSData
        data.write(toFile: localPath!, atomically: true)
        //let imageData = NSData(contentsOfFile: localPath!)!
        let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
        print(photoURL)

    }

Okay, I've solved the issue.

All you have to do is simply grab the image (info[UIImagePickerControllerOriginalImage] as UIImage) and save to the given directory. If you need to save only 1 picture it works great. The code id below.

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
    let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
    let imageName = imageURL.path!.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
    let localPath = documentDirectory.stringByAppendingPathComponent(imageName)

    let image = info[UIImagePickerControllerOriginalImage] as UIImage
    let data = UIImagePNGRepresentation(image)
    data.writeToFile(localPath, atomically: true)

    let imageData = NSData(contentsOfFile: localPath)!
    let photoURL = NSURL(fileURLWithPath: localPath)
    let imageWithData = UIImage(data: imageData)!

    picker.dismissViewControllerAnimated(true, completion: nil)

}