參考資料：

圖例：

跳轉的動畫有很多，全部可以自定義

建立自定義轉換你必須遵循三個步驟:

• 1、建立一個類,並實現了 UIViewControllerAnimatedTransitioning 協議
• 2、建立一個類作為 UINavigationControllerDelegate 過渡代理，實現對應方法
• 3、在將要 push 的控制器內設定導航控制器的代理為自定義的代理（步驟2的代理類）

核心程式碼

1、建立一個類,並實現了 UIViewControllerAnimatedTransitioning 協議

class CustomNaviAnimatedTransition: NSObject {
    var isPushed: Bool?

    // 通過 static let 建立單例
    static let shared = CustomNaviAnimatedTransition()
    // 建構函式，init前加private修飾,表示原始構造方法只能自己使用，外界不發呼叫
    private override init() { }
}

/// 從左往右進，從左往右出
extension CustomNaviAnimatedTransition: UIViewControllerAnimatedTransitioning {

    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        return 0.5
 

    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        let fromView = transitionContext.view(forKey: .from)!
        let toView = transitionContext.view(forKey: .to)!
        let containerView = transitionContext.containerView

        if isPushed == true {

            containerView.addSubview
 
(toView)
            toView.frame.origin.x = -toView.bounds.width

            UIView.animate(withDuration: 0.3, animations: {
                toView.frame.origin.x = 0
            }, completion: { (finished) in
                if finished {
                    transitionContext.completeTransition(finished)
                }
            })

        } else {

            containerView.insertSubview
 
(toView, belowSubview: fromView)
            UIView.animate(withDuration: 0.3, animations: {
                fromView.frame.origin.x = fromView.frame.width
            }, completion: { (finished) in
                if finished {
                    transitionContext.completeTransition(finished)
                }
            })
        }
    }
}

2、建立一個類作為 UINavigationControllerDelegate 過渡代理，實現對應方法

class CustomNaviAnimateDelagete: NSObject, UINavigationControllerDelegate {

    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        let animationTransition = CustomNaviAnimatedTransition.shared
        animationTransition.isPushed = operation.rawValue == 1
        return animationTransition
    }
}

3、在將要 push 的控制器內設定導航控制器的代理為自定義的代理（步驟2的代理類）

注意：代理不能為區域性變數

class ViewController: UIViewController {

    var cnaDelegate = CustomNaviAnimateDelagete()

    override func viewDidLoad() {
        super.viewDidLoad()

        self.navigationController?.delegate = cnaDelegate
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let vc = TempViewController()
        navigationController?.pushViewController(vc, animated: true)
    }
}