FullScreenTransitionManager.swift - From "Transition images to full screen animated" @ medium.com

FullScreenTransitionManager.swift

//
// FullScreenTransitionManager.swift
//

import Foundation
import UIKit

final class FullScreenTransitionManager: NSObject, UIViewControllerTransitioningDelegate {
    private let anchorViewTag: Int
    private weak var anchorView: UIView?
    
    init(anchorViewTag: Int) {
        self.anchorViewTag = anchorViewTag
    }
    
    func presentationController(forPresented presented: UIViewController,
                                presenting: UIViewController?,
                                source: UIViewController) -> UIPresentationController? {
        anchorView = (presenting ?? source).view.viewWithTag(anchorViewTag)
        return FullScreenPresentationController(presentedViewController: presented, presenting: presenting)
    }
    
    func animationController(forPresented presented: UIViewController,
                             presenting: UIViewController,
                             source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        FullScreenAnimationController(animationType: .present, anchorView: anchorView)
    }

    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        FullScreenAnimationController(animationType: .dismiss, anchorView: anchorView)
    }
}