Completion handler for UINavigationController “pushViewController:animated”?

Question

I\'m about creating an app using a UINavigationController to present the next view controllers. With iOS5 there´s a new method to presenting UIViewControl

Answer 1

Here is the Swift 4 version with the Pop.

extension UINavigationController {
    public func pushViewController(viewController: UIViewController,
                                   animated: Bool,
                                   completion: (() -> Void)?) {
        CATransaction.begin()
        CATransaction.setCompletionBlock(completion)
        pushViewController(viewController, animated: animated)
        CATransaction.commit()
    }

    public func popViewController(animated: Bool,
                                  completion: (() -> Void)?) {
        CATransaction.begin()
        CATransaction.setCompletionBlock(completion)
        popViewController(animated: animated)
        CATransaction.commit()
    }
}

Just in case someone else needs this.