 
         longPressGestureImageView.alpha = 0.0
         longPressGestureImageView.hidden = false
-        UIView.animateWithDuration(1.0, animations: {
+        UIView.animateWithDuration(fadeInDuration, animations: {
             self.longPressGestureImageView.alpha = 1.0
             }, completion: { _ in
                 UIView.animateKeyframesWithDuration(self.animationDuration, delay: self.animationDelay, options: .Repeat, animations: {


        doubleTapGestureImageView.alpha = 0.0
        doubleTapGestureImageView.hidden = false
        UIView.animateWithDuration(1.0, animations: {
            self.doubleTapGestureImageView.alpha = 1.0
            }, completion: { _ in
                UIView.animateKeyframesWithDuration(self.animationDuration, delay: self.animationDelay, options: .Repeat, animations: {


    // MARK: - Constants

    private let fadeInDuration: NSTimeInterval = 1.0
    private let animationDuration: NSTimeInterval = 2.0
    private let animationDelay: NSTimeInterval = 0.5

