cant conform to RMPZoomTransitionAnimating protocol about rmpzoomtransitionanimator HOT 2 OPEN

// MARK: - UINavigationControllerDelegate
extension NewsViewController: UINavigationControllerDelegate {

    func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        if fromVC is RMPZoomTransitionAnimating && toVC is RMPZoomTransitionAnimating {
            let animator = RMPZoomTransitionAnimator()
            animator.goingForward = (operation == .Push)
            animator.sourceTransition = fromVC as? protocol<RMPZoomTransitionAnimating, RMPZoomTransitionDelegate>
            animator.destinationTransition = toVC as? protocol<RMPZoomTransitionAnimating, RMPZoomTransitionDelegate>
            return animator
        } else {
            return nil
        }
    }
}

// MARK: - RMPZoomTransitionAnimating/RMPZoomTransitionDelegate
extension NewsViewController: RMPZoomTransitionAnimating, RMPZoomTransitionDelegate {

    func imageViewFrame() -> CGRect {
        if let collectionView = self.collectionView(),
            let indexPath = self.selectedIndexPath,
            let cell = collectionView.cellForItemAtIndexPath(indexPath) as? NewsCollectionViewCell,
            let imageView = cell.fgImageView {
                let frame = imageView.convertRect(imageView.frame, toView: self.view.window)
                return frame
        }
        return CGRectZero
    }

    func transitionSourceImageView() -> UIImageView! {
        let imageView = UIImageView()
        imageView.clipsToBounds = true
        imageView.userInteractionEnabled = false
        imageView.contentMode = .ScaleAspectFill
        imageView.frame = imageViewFrame()
        imageView.image = self.selectedNewsViewCell?.fgImageView!.image
        return imageView
    }

    func transitionSourceBackgroundColor() -> UIColor! {
        return UIColor.whiteColor()
    }

    func transitionDestinationImageViewFrame() -> CGRect {
        return imageViewFrame()
    }

    func zoomTransitionAnimator(animator: RMPZoomTransitionAnimator!, didCompleteTransition didComplete: Bool, animatingSourceImageView imageView: UIImageView!) {

    }
}