カメラアプリのスタンプ

こんにちは！

カメラアプリを作成しているのですが、既存のカメラアプリに実装されている枠線と矢印みたいな機能は
どうすればつけることができますか？
↓こんなの

指で拡大縮小もできるけど、ボタンでもすいすい拡大縮小回転なんでもできるような
機能をぜひつけたいと思っているので、教えてください！

よろしくお願いします！

2/19 16:43追記

ikuwowさん見てくださってありがとうございます！

表示する画面のコード

class ViewController: UIViewController {

 @IBOutlet var backImageView: UIImageView!
 var appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
   
    override func viewDidLoad() {
        super.viewDidLoad()    
        setImage()    
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    
  /****ここでカメラロールで選んだ写真を表示！****/
    func setImage() {
        backImageView.image = selectImage
    }
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
       /****ここでスタンプを表示！****/
        if appDelegate.isNewStampAdded == true {
            let stamp = appDelegate.stampArray.last!
            stamp.frame = CGRectMake(0, 0, 150, 150)
            stamp.center = canvasView.center
            stamp.userInteractionEnabled = true
            canvasView.addSubview(stamp)
            appDelegate.isNewStampAdded = false 
        }
    }
  /****スタンプを追加するためのボタン！****/
    @IBAction func stampTapped() {
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .ActionSheet)
        
        alert.addAction(UIAlertAction(title: "スタンプを追加", style: .Default) { action in
                
                let ss = self.storyboard?.instantiateViewControllerWithIdentifier("StampSelectTab") as! SelectTabViewController
                ss.modalTransitionStyle = UIModalTransitionStyle.CoverVertical
                self.presentViewController(ss, animated: true, completion: nil)
                
        })
        
        alert.addAction(UIAlertAction(title: "フレームを追加", style: .Default) { action in
            //実装予定！いつかフレームも追加したい！
        })
        
        alert.addAction(
            UIAlertAction(title: "キャンセル", style: UIAlertActionStyle.Cancel, handler: nil)
        )
        
        presentViewController(alert, animated: true, completion: nil)
    
    }
}

スタンプを動かしているコード


class Stamp: UIImageView, UIGestureRecognizerDelegate {
    
    var currentTransform: CGAffineTransform!
    var scale: CGFloat = 1.0
    var angle: CGFloat = 0
    var isMoving: Bool = false
    
    override func didMoveToSuperview() {
        let rotationRecognizer: UIRotationGestureRecognizer = UIRotationGestureRecognizer(target: self, action: "rotationGesture:")
        rotationRecognizer.delegate = self
        self.addGestureRecognizer(rotationRecognizer)
        
        let pinchRecognizer: UIPinchGestureRecognizer = UIPinchGestureRecognizer(target: self, action: "pinchGesture:")
        pinchRecognizer.delegate = self
        self.addGestureRecognizer(pinchRecognizer)
    }

    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
      
    func rotationGesture(gesture: UIRotationGestureRecognizer) {
        if !isMoving && gesture.state == UIGestureRecognizerState.Began {
            isMoving = true
            currentTransform = self.transform
        } else if isMoving && gesture.state == UIGestureRecognizerState.Ended {
            isMoving = false
            scale = 1.0
            angle = 0.0
        }
        
        angle = gesture.rotation
        
        let transform = CGAffineTransformConcat(CGAffineTransformConcat(currentTransform, CGAffineTransformMakeRotation(angle)), CGAffineTransformMakeScale(scale, scale))
        
        self.transform = transform
    }
    
    func pinchGesture(gesture: UIPinchGestureRecognizer) {
        if !isMoving && gesture.state == UIGestureRecognizerState.Began {
            isMoving = true
            currentTransform = self.transform
        } else if isMoving && gesture.state == UIGestureRecognizerState.Ended {
            isMoving = false
            scale = 1.0
            angle = 0.0
        }
        
        scale = gesture.scale
        
        let transform = CGAffineTransformConcat(CGAffineTransformConcat(currentTransform, CGAffineTransformMakeRotation(angle)), CGAffineTransformMakeScale(scale, scale))
        
        self.transform = transform;
    }
    
    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        self.superview?.bringSubviewToFront(self)
        /****動かしたら枠線を表示！****/
        self.layer.borderWidth = 2.0
        self.layer.borderColor = UIColor.redColor().CGColor

    }
    
    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        let touch = touches.first!
        
        let dx = touch.locationInView(self.superview).x - touch.previousLocationInView(self.superview).x
        let dy = touch.locationInView(self.superview).y - touch.previousLocationInView(self.superview).y
        
        self.center = CGPointMake(self.center.x + dx, self.center.y + dy)
        
        self.layer.borderWidth = 2.0
        
    }
    
    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        /*****保存のときに邪魔だからイベントが終わったら消す！****/
        self.layer.borderWidth = 0.0
        self.layer.borderColor = UIColor.clearColor().CGColor
        
    }
    
}

世界一受けたいiPhoneアプリ開発の授業をベースに作ってます！