[ios] How to enable back/left swipe gesture in UINavigationController after setting leftBarButtonItem?

In Swift you can do the following code

import UIKit
extension UINavigationController: UIGestureRecognizerDelegate {

    open override func viewDidLoad() {
        super.viewDidLoad()
        interactivePopGestureRecognizer?.delegate = self
    }

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return viewControllers.count > 1
    }
}

Above code helps in swift left to go back to previous controller like Facebook, Twitter.

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