example of UIViewControllerTransitionCoordinator Mocked

UIViewControllerTransitionCoordinatorMocked.swift

class UIViewControllerTransitionCoordinatorMocked: NSObject, UIViewControllerTransitionCoordinator {

    var animateWasCalled = false

    func animate(alongsideTransition animation: ((UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool {

        animateWasCalled = true

        if let completion = completion {
            completion(self)
        }
        return true
    }

    override init () { }

    func animateAlongsideTransition(in view: UIView?, animation: ((UIViewControllerTransitionCoordinatorContext) -> Void)?, completion: ((UIViewControllerTransitionCoordinatorContext) -> Void)? = nil) -> Bool {
        if let completion = completion {
            completion(self)
        }

        return true
    }

    func notifyWhenInteractionEnds(_ handler: @escaping (UIViewControllerTransitionCoordinatorContext) -> Void) {
        handler(self)
    }

    func notifyWhenInteractionChanges(_ handler: @escaping (UIViewControllerTransitionCoordinatorContext) -> Void) {
        handler(self)
    }

    var isAnimated: Bool = false

    var presentationStyle: UIModalPresentationStyle = .automatic

    var initiallyInteractive: Bool  = false

    var isInterruptible: Bool  = false

    var isInteractive: Bool  = false

    var isCancelled: Bool  = false

    var transitionDuration: TimeInterval = 0.0

    var percentComplete: CGFloat = 0.0

    var completionVelocity: CGFloat = 0.0

    var completionCurve: UIView.AnimationCurve = .easeIn

    func viewController(forKey key: UITransitionContextViewControllerKey) -> UIViewController? {
        return nil
    }

    func view(forKey key: UITransitionContextViewKey) -> UIView? {
        return nil
    }

    var containerView: UIView = UIView()

    var targetTransform: CGAffineTransform = .identity

}