iOS开发——自定义转场动画

// 返回负责转场的控制器对象    func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? {        return PopoverPresentationController(presentedViewController: presented, presentingViewController: presenting)    }    // 返回提供modal动画的对象    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {        isPresented = true        return self    }    // 返回提供dismiss动画的对象    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {        isPresented = false        return self    }    // 动画时长    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {        return 1.2    }    // 转场动画实现函数    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {                }

// 设置转场动画代理vc.transitioningDelegate = self// 将转场动画设置为自定义vc.modalPresentationStyle = UIModalPresentationStyle.Custom