ios - PushViewController 详细信息？

Question

我想做的是从左侧插入ViewController的自定义动画。我已经创建了自定义过渡委托(delegate)，并提供了自定义动画，一切正常(新 View 从左侧幻灯片)。唯一的问题是 iOS 中的推送动画不仅仅是从右侧滑动 View 。被遮挡的 VC 也在与被插入的 VC 相同的方向上轻微移动。另外，导航栏有点闪烁。我当然可以尝试通过猜测参数应该是什么来模仿这种行为(例如，被遮挡的 VC 在不同的 iPhone 上移动了多少)，但也许可以在某个地方找到这些值？非常感谢您的帮助。

Answer 1

我将创建一个遵守 UIViewControllerAnimatedTransitioning 协议(protocol)的对象

class CustomHorizontalSlideTransition: NSObject, UIViewControllerAnimatedTransitioning {

    var operation: UINavigationControllerOperation = .Push

    convenience init(operation: UINavigationControllerOperation) {
        self.init()
        self.operation = operation
    }

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

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let containerView = transitionContext.containerView()

        let disappearingVC = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
        let appearingVC = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!

        let bounds = UIScreen.mainScreen().bounds

        if self.operation == .Push {
            appearingVC.view.frame = CGRectOffset(bounds, -bounds.size.height, 0)
            containerView!.addSubview(disappearingVC.view)
            containerView!.addSubview(appearingVC.view)
        } else {
            appearingVC.view.frame = bounds
            disappearingVC.view.frame = bounds
            containerView!.addSubview(appearingVC.view)
            containerView!.addSubview(disappearingVC.view)
        }

        UIView.animateWithDuration(transitionDuration(transitionContext),
            delay: 0.0,
            options: UIViewAnimationOptions.CurveEaseInOut,
            animations: { () -> Void in

                if self.operation == .Push {
                    appearingVC.view.frame = bounds
                } else {
                    disappearingVC.view.frame = CGRectOffset(bounds, -bounds.size.width, 0)
                }

            }) { (complete) -> Void in
                transitionContext.completeTransition(true)
        }
    }
}

然后在“From”和“To” View Controller 中，将 navigationController 的委托(delegate)设置为 View ViewDidAppear 中的 self

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

在两个 View Controller 中，重写以下内容以提供 transitionAnimatedTransition 委托(delegate)方法并返回动画的协议(protocol)遵守实例

override func transitionAnimatedTransition(operation: UINavigationControllerOperation) -> UIViewControllerAnimatedTransitioning? {
        return CustomHorizontalSlideTransition(operation: operation)
}