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func downloadImage(from storageImagePath: String) {
        // 1. Get a filePath to save the image at
        let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
        let documentsDirectory = paths[0]
        let filePath = "file:\(documentsDirectory)/myimage.jpg"
        // 2. Get the url of that file path
        guard let fileURL = URL(string: filePath) else { return }

        // 3. Start download of image and write it to the file url
        storageDownloadTask = storageRef.child(storageImagePath).write(toFile: fileURL, completion: { (url, error) in

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var unicorn: Unicorn? {
        didSet {
            if let unicorn = unicorn {
                downloadImage(from: unicorn.imagePath)
                addedBy.text = unicorn.addedBy
                seenAt.text = unicorn.seenAt
            }
        }
    }

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override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        ref.child("unicorns").observe(.value) { snapshot in
            var unicorns = [Unicorn]()
            for unicornSnapshot in snapshot.children {
                let unicorn = Unicorn(snapshot: unicornSnapshot as! DataSnapshot)
                unicorns.append(unicorn)
            }
            self.unicorns = unicorns
        }

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fileprivate func writeUnicornToDatabase(_ unicorn: Unicorn) {
        // Access the "unicorns" child reference and then access (create) a unique child reference within it and finally set its value
        ref.child("unicorns").child(unicorn.seenAt + "\(Int(Date.timeIntervalSinceReferenceDate * 1000))").setValue(unicorn.toAnyObject())
    }

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 @IBAction func didTapSubmit(_ sender: UIButton) {
        // Get properties for the unicorn-to-be-created
        let addedBy = self.addedBy.text ?? ""
        let seenAt = self.seenAt.text ?? ""
        let unicorn = Unicorn(imagePath: storageImagePath, addedBy: addedBy, seenAt: seenAt)

        // Create the unicorn and record it
        writeUnicornToDatabase(unicorn)

        // Return to Unicorns Table VC

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fileprivate func uploadSuccess(_ storagePath: String, _ storageImage: UIImage) {

        // Update the unicorn image view with the selected image
        unicornImageView.image = storageImage
        // Updated global variable for the storage path for the selected image
        storageImagePath = storagePath

        // Enable submit button and change its color
        submitButton.isEnabled = true
        submitButton.backgroundColor = .green

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func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        picker.dismiss(animated: true, completion: nil)

        // 1. Get image data from selected image
        guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage,
            let imageData = UIImageJPEGRepresentation(image, 0.5) else {
                print("Could not get Image JPEG Representation")
                return
        }

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import Foundation
import FirebaseDatabase

struct Unicorn {
    let imagePath: String
    let addedBy: String
    let seenAt: String

    // Standard init
    init(imagePath: String, addedBy: String, seenAt: String) {

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import Foundation

struct Unicorn {
    let imagePath: String
    let addedBy: String
    let seenAt: String

    // Standard initializer
    init(imagePath: String, addedBy: String, seenAt: String) {
        self.imagePath = imagePath

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var ref: DatabaseReference!

ref = Database.database().reference()