SamStone92

class CustomInteractor : UIPercentDrivenInteractiveTransition {
    
    var navigationController : UINavigationController
    var shouldCompleteTransition = false
    var transitionInProgress = false

    init?(attachTo viewController : UIViewController) {
        if let nav = viewController.navigationController {
            self.navigationController = nav
            super.init()

SamStone92

func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
      guard let frame = self.selectedFrame else { return nil }
      guard let song = self.selectedSong else { return nil }

      switch operation {
      case .push:
          return CustomAnimator(duration: TimeInterval(UINavigationControllerHideShowBarDuration), isPresenting: true, originFrame: frame, image: song.artwork)
      default:
          return CustomAnimator(duration: TimeInterval(UINavigationControllerHideShowBarDuration), isPresenting: false, originFrame: frame, image: song.artwork)
      }

SamStone92

func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {

}

SamStone92

  func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        self.selectedSong = songs[indexPath.row]
        let theAttributes:UICollectionViewLayoutAttributes! = collectionView.layoutAttributesForItem(at: indexPath)
        selectedFrame = collectionView.convert(theAttributes.frame, to: collectionView.superview)
        self.performSegue(withIdentifier: "Player", sender: self)
    }

SamStone92

self.navigationController?.delegate = self

SamStone92

class CustomAnimator : NSObject, UIViewControllerAnimatedTransitioning {
    var duration : TimeInterval
    var isPresenting : Bool
    var originFrame : CGRect
    var image : UIImage
    
    public let CustomAnimatorTag = 99
    
    init(duration : TimeInterval, isPresenting : Bool, originFrame : CGRect, image : UIImage) {
        self.duration = duration

SamStone92

UIView.animate(withDuration: duration, animations: {
            transitionImageView.frame = self.isPresenting ? artwork.frame : self.originFrame
            detailView.frame = self.isPresenting ? fromView.frame : CGRect(x: toView.frame.width, y: 0, width: toView.frame.width, height: toView.frame.height)
            detailView.alpha = self.isPresenting ? 1 : 0
        }, completion: { (finished) in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
            transitionImageView.removeFromSuperview()
            artwork.alpha = 1
        })

SamStone92

let transitionImageView = UIImageView(frame: isPresenting ? originFrame : artwork.frame)
transitionImageView.image = image
        
container.addSubview(transitionImageView)

SamStone92

guard let artwork = detailView.viewWithTag(CustomAnimatorTag) as? UIImageView else { return }
artwork.image = image
artwork.alpha = 0

SamStone92

public let CustomAnimatorTag = 99