Navigation & Modal 自定义转场动画

Navigation 转场用法

class LoginViewController {
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.navigationController?.delegate = self
    }
}

extension LoginViewController: UINavigationControllerDelegate {
    
    func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        
        switch operation {
        case .push:
            return GotoAnimatedTransitioning()
        case .pop:
            return GoBackAnimatedTransitioning()
        default:
            return nil
        }
    }
}

Modal 转场用法

let vc = ForgetPasswordViewController()
vc.transitioningDelegate = self
vc.modalPresentationStyle = .fullScreen
self?.present(vc, animated: true)

extension LoginViewController: UIViewControllerTransitioningDelegate {
    
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
       
        return GotoAnimatedTransitioning()
    }
    
    func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
       
        return GoBackAnimatedTransitioning()
    }
}

Push / Present 自定义转场动画

class GotoAnimatedTransitioning: NSObject, UIViewControllerAnimatedTransitioning {

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

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let toViewController = transitionContext.viewController(forKey: .to) else { return }
        
        transitionContext.containerView.addSubview(toViewController.view)
        toViewController.view.alpha = 0
        toViewController.view.transform = CGAffineTransform(scaleX: 0, y: 0)
        let duration = self.transitionDuration(using: transitionContext)
        UIView.animate(withDuration: duration, animations: {
            toViewController.view.alpha = 1
            toViewController.view.transform = .identity
        }, completion: { _ in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        })
    }
}

Pop / Dismiss 自定义转场动画

class GoBackAnimatedTransitioning: NSObject, UIViewControllerAnimatedTransitioning {

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

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        guard let fromViewController = transitionContext.viewController(forKey: .from), let toViewController = transitionContext.viewController(forKey: .to) else {
            return
        }

        transitionContext.containerView.insertSubview(toViewController.view, belowSubview: fromViewController.view)

        let duration = self.transitionDuration(using: transitionContext)
        UIView.animate(withDuration: duration, animations: {
            fromViewController.view.alpha = 0
        }, completion: { _ in
            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)
        })
    }
}