swift - 如何创建模态动画，其中向上滑动屏幕上半部分，向下滑动屏幕下半部分

Question

我想创建一个模态动画，其中顶部布局向上滑动，底部布局向下滑动。

类似于此图像:

注:图片取自 Vertical Screen Split Transitions (Animation)

Answer 1

创建一个对象并提供自定义呈现动画:

class TheVendor: NSObject, UIViewControllerTransitioningDelegate {
    func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return TheAnimator()
    }
}

然后创建动画师:

class TheAnimator: NSObject, UIViewControllerAnimatedTransitioning {
    func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
        // return a duration
    }
    func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
        // return the custom animation
    }
}

然后，当您呈现时，进行正确的绑定(bind):

presentedViewController.transitioningDelegate = TheVendor()
presentedViewController.modalPresentationStyle = .custom