비뚤어진 녀석을 연기하다

최근에 애니메이션 관련 작업을 하지 않아서 어떻게 하는지 완전히 잊어버렸어요.
재활 훈련과 동시에 해 봤어요.

    func viewHamon(size: CGFloat) -> UIImage{
        UIGraphicsBeginImageContext(CGRectMake(100, 100, size, size).size);

        let context: CGContextRef = UIGraphicsGetCurrentContext()!
        CGContextSaveGState(context)

        CGContextSetFillColorWithColor(context, UIColor.clearColor().CGColor)
        CGContextFillRect(context, self.view.frame)

        let x = CGFloat(size/2)
        let y = CGFloat(size/2)
        let r = CGFloat((size/2)-10)


        let path : CGMutablePathRef = CGPathCreateMutable()

        CGPathAddArc(path, nil, x, y, r, 0, CGFloat(M_PI*2), false)

        CGContextAddPath(context, path)
        CGContextSetStrokeColorWithColor(context,UIColor.blackColor().CGColor)
        CGContextDrawPath(context, CGPathDrawingMode.FillStroke)

        let image = UIGraphicsGetImageFromCurrentImageContext()

        CGContextRestoreGState(context)

        return image
    }


    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        super.touchesBegan(touches, withEvent: event)

        if let touch = touches.first {
            let location = touch.locationInView(self.view)

            for(var i:Int = 0; i<3; i++){

                let layer = CAShapeLayer()
                layer.frame = CGRectMake(location.x, location.y, 100, 100)
                layer.position = CGPointMake(location.x, location.y)
                let image = viewHamon(100)
                layer.contents = image.CGImage

                self.view.layer.addSublayer(layer)

                CATransaction.begin()
                CATransaction.setAnimationDuration(5.0)
                CATransaction.setCompletionBlock({
                    layer.removeFromSuperlayer()
                })


                let animation : CABasicAnimation = CABasicAnimation(keyPath: "transform.scale")
                animation.delegate = self
                animation.timingFunction = CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseOut)

                animation.duration = 3
                animation.removedOnCompletion = false
                animation.fillMode = kCAFillModeForwards                
                animation.toValue = NSNumber(double: 2.0)


                let animation2 : CABasicAnimation = CABasicAnimation(keyPath: "opacity")
                animation2.delegate = self
                animation2.duration = 3
                animation2.removedOnCompletion = false
                animation2.fillMode = kCAFillModeForwards
                animation2.fromValue = NSNumber(double: 1.0)
                animation2.toValue = NSNumber(double: 0.0)

                let group : CAAnimationGroup = CAAnimationGroup()
                group.beginTime = CACurrentMediaTime() + Double(i)*0.35
                group.animations = [animation, animation2]
                group.removedOnCompletion = false
                group.fillMode = kCAFillModeBackwards

                layer.addAnimation(group, forKey: "scale")
                layer.opacity = 0.0
                CATransaction.commit()
            }

        }
    }

그게 다야.