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)
               })
           })
       })
   }

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
    }