PushViewController的细节？

Question

我想要做的是一个自定义的动画，把ViewController从左侧的端推出来。我已经创建了我的自定义转换委托，我提供了我的自定义动画，一切正常工作(从左边的新视图幻灯片)。唯一的问题是，iOS中的push动画不仅仅是从右侧滑动视图。被模糊的VC也在向与被推送的VC相同的方向移动。还有导航条有点闪烁。当然，我可以尝试通过猜测参数应该是什么来模仿这种行为(例如，在不同的iPhones上被模糊化的VC移动了多少)，但是也许可以在某个地方找到值呢？非常感激的帮助。

Answer 1

我将创建一个符合UIViewControllerAnimatedTransitioning协议的对象。

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“从”和“到”视图控制器中，在视图ViewDidAppear中将导航控制器的委托设置为self

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

在两个视图控制器中，重写以下内容以提供transitionAnimatedTransition委托方法，并返回动画中遵循协议的实例

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