gistfile1.swift

func delay(#seconds: Double, completion:()->()) {
    let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64( Double(NSEC_PER_SEC) * seconds ))
    
    dispatch_after(popTime, dispatch_get_main_queue()) {
        completion()
    }
}


class ViewController: UIViewController, GMSMapViewDelegate {
    
    var mapView: GMSMapView?
    
    var percent: CGFloat = 1.0

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.view.backgroundColor = UIColor.whiteColor();
        let camera = GMSCameraPosition.cameraWithLatitude(-37.813047, longitude: -72.8561644, zoom:7)
        mapView = GMSMapView.mapWithFrame(CGRectZero, camera:camera)
        
        let marker = GMSMarker()
        marker.position = camera.target
        marker.snippet = "Hello World"
        marker.appearAnimation = kGMSMarkerAnimationPop
        marker.map = mapView
        let originalImage = UIImage(named: "markerIcon")
        let newImage = originalImage
        marker.icon = newImage

        self.view = mapView
    
        self.mapView?.delegate = self
        
        
    }
    
    func newImageWithWidth(image: UIImage, width: CGFloat, height: CGFloat) -> UIImage{
        let imageSize = CGSize(width: width, height: height)
        UIGraphicsBeginImageContext(imageSize)
        
        let imageRect = CGRectMake(0, 0, width, height)
        image.drawInRect(imageRect)
        
        let resizedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        return resizedImage
    }

    
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
    }
    
    func mapView(mapView: GMSMapView!, didTapMarker marker: GMSMarker!) -> Bool {
        
        let originalImage = UIImage(named: "markerIcon")
        
        delay(seconds: 0.05) { () -> () in
            marker.icon = self.newImageWithWidth(originalImage!, width: originalImage!.size.width/2, height: originalImage!.size.height)
            delay(seconds: 0.05, { () -> () in
                marker.icon = self.newImageWithWidth(originalImage!, width: 0.1, height: originalImage!.size.height)
                delay(seconds: 0.05, { () -> () in
                    marker.icon = self.newImageWithWidth(originalImage!, width: originalImage!.size.width/2, height: originalImage!.size.height)
                    delay(seconds: 0.05, { () -> () in
                        marker.icon = self.newImageWithWidth(originalImage!, width: originalImage!.size.width, height: originalImage!.size.height)
                    })
                })
            })
        }

        
        return true
    }
    

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}