Presenting UIAlertController for uploading a photo

SelectImageVC.swift

@IBAction func loadImage(sender: AnyObject) {
    let imagePickerActionSheet = UIAlertController(title: "Take/Upload Photo",
                                                   message: nil, preferredStyle: .ActionSheet)
    if UIImagePickerController.isSourceTypeAvailable(.Camera) {
        let cameraButton = UIAlertAction(title: "Take Photo", style: .Default, handler: { (alert) in
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = .Camera
            self.presentViewController(imagePicker, animated: true, completion: nil)
        })
        imagePickerActionSheet.addAction(cameraButton)
    }
    let libraryButton = UIAlertAction(title: "Choose Existing", style: .Default) { (alert) in
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .PhotoLibrary
        self.presentViewController(imagePicker, animated: true, completion: nil)
    }
    imagePickerActionSheet.addAction(libraryButton)
    let cancelButton = UIAlertAction(title: "Cancel", style: .Cancel) { (alert) in }
    imagePickerActionSheet.addAction(cancelButton)
    presentViewController(imagePickerActionSheet, animated: true, completion: nil)
}