UIImagePicker (Photo Library, Camera) in swift

Variable declaration:

    let imagePicker = UIImagePickerController()

    @IBOutlet weak var imageButton: UIButton!

    var image_data: NSData?

Methods:

 @IBAction func imageButtonDidPress(sender: AnyObject)

    {

        //show the action sheet (i.e. the little pop-up box from the bottom that allows you to choose whether you want to pick a photo from the photo library or from your camera

        let optionMenu = UIAlertController(title: nil, message: "Get Photo", preferredStyle: UIAlertControllerStyle.ActionSheet)

        

        let photoLibraryOption = UIAlertAction(title: "Photo Library", style: UIAlertActionStyle.Default, handler: { (alert: UIAlertAction!) -> Void in

            //shows the photo library

            self.imagePicker.allowsEditing = true

            self.imagePicker.sourceType = .PhotoLibrary

            self.imagePicker.modalPresentationStyle = .Popover

            self.presentViewController(self.imagePicker, animated: true, completion: nil)

        })

        let cameraOption = UIAlertAction(title: "Take Photo", style: UIAlertActionStyle.Default, handler: { (alert: UIAlertAction!) -> Void in

            //shows the camera

            self.imagePicker.allowsEditing = true

            self.imagePicker.sourceType = .Camera

            self.imagePicker.modalPresentationStyle = .Popover

            self.presentViewController(self.imagePicker, animated: true, completion: nil)

            

        })

        let cancelOption = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: {

            (alert: UIAlertAction!) -> Void in

        })

        

        //Adding the actions to the action sheet. Camera will only show up as an option if the camera is available in the first place.

        optionMenu.addAction(photoLibraryOption)

        optionMenu.addAction(cancelOption)

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) == true {

            optionMenu.addAction(cameraOption)} else {

        }

        self.presentViewController(optionMenu, animated: true, completion: nil)

    }

    

    

    //The UIImagePickerController is a view controller that gets presented modally. When we select or cancel the picker, it runs the delegate, where we handle the case and dismiss the modal.

    

    func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {

        self.imageButton.setBackgroundImage(image, forState: UIControlState.Normal)

    }

    

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

        //handle media here i.e. do stuff with photo

        let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage

        self.imageButton.setBackgroundImage(chosenImage, forState: UIControlState.Normal)

        

        dismissViewControllerAnimated(true, completion: nil)

    }

    func imagePickerControllerDidCancel(picker: UIImagePickerController) {

        //what happens when you cancel

        //which, in our case, is just to get rid of the photo picker which pops up

        dismissViewControllerAnimated(true, completion: nil)

    }