iOS：容器视图 - 更改子视图控制器时的动画推送转换 [英] iOS: Container view - animate push transition when changing child view controllers

问题描述

Apple讨论了如何在两个子视图控制器之间进行容器视图控制器转换文档。我想在 UIModalTransitionStyle 中设置与 UIModalTransitionStyleCoverVertical 相同的简单推送垂直滑动。但是， transitionFromViewController 只允许使用 UIViewAnimationOptions ，而不是转换样式。那么如何动画播放视图呢？

Apple discusses how to have a container view controller transition between two child view controllers in this document. I would like to animate a simple push vertical slide up identical to UIModalTransitionStyleCoverVertical in UIModalTransitionStyle. However, transitionFromViewController only allows use of UIViewAnimationOptions, not transition styles. So how would one animate sliding a view up?

奇怪的是，在子视图控制器之间进行转换，你不能在 UINavigationController 为转换设置动画。

It's odd that to transition between child view controllers you can't call a simple push method similar in UINavigationController to animate the transition.

推荐答案

加载子视图，在origin.y下设置框架底部屏幕。在动画块中将其更改为0后。示例：

Load child view, set frame with origin.y under bottom screen. After change it to 0 in animation block. Example:

enum Animation {
    case LeftToRight
    case RightToLeft
}

func animationForLoad(fromvc: UIViewController, tovc: UIViewController, with animation: Animation) {

        self.addChildViewController(tovc)
        self.container.addSubview(tovc.view)
        self.currentVC = tovc

        var endOriginx: CGFloat = 0

        if animation == Animation.LeftToRight {
            tovc.view.frame.origin.x = -self.view.bounds.width
            endOriginx += fromvc.view.frame.width
        } else {
            tovc.view.frame.origin.x = self.view.bounds.width
            endOriginx -= fromvc.view.frame.width
        }

        self.transition(from: fromvc, to: tovc, duration: 0.35, options: UIViewAnimationOptions.beginFromCurrentState, animations: {
            tovc.view.frame = fromvc.view.frame
            fromvc.view.frame.origin.x = endOriginx
            }, completion: { (finish) in
                tovc.didMove(toParentViewController: self)
                fromvc.view.removeFromSuperview()
                fromvc.removeFromParentViewController()               
        })           
    }

上面的代码是2个子视图之间的过渡和弹出水平动画。

Above code is transition between 2 child view with push and pop horizontal animation.

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