This is a cool custom transition between two or more UICollectionViewControllers with wave-like cell animation. Could be used in e.g. galleries.

Animation idea was taken from Łukasz Frankiewicz Dribble project

There are two options:

• Via CocoaPods.
• Manually add the files into your Xcode project. Slightly simpler, but updates are also manual.

• In storyboard add an object in your NavigationController.

• Set it's class to NavigationControllerDelegate

• Set NavigationController delegate to this object.

or

Implement UINavigationControllerDelegate in your ViewController:

func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation,
        fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
            let animator = CKWaveCollectionViewAnimator()
            if operation != UINavigationControllerOperation.Push {
                animator.reversed = true
            }

            return animator
    }

• The last thing you have to set is selectedIndexPath property in your didSelectItemAtIndexPath method implementation.

override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        selectedIndexPath = indexPath
}

internal let animationDuration: Double! = 1.0

Total animation duration.

internal let kCellAnimSmallDelta: Double! = 0.01
internal let kCellAnimBigDelta: Double! = 0.03

Properties you can change to adjust animation.

• iOS 7.0+

Released under the MIT license. See the LICENSE file for more info.