iPhone - presentModalViewController 从右侧过渡答案

【问题标题】：iPhone - presentModalViewController with transition from rightiPhone - presentModalViewController 从右侧过渡
【发布时间】：2011-10-16 02:51:37
【问题描述】：

我正在使用 presentModalView 控制器并通过其控制器将转换推送到新视图。我正在使用以下代码进行转换（效果很好）

    [self presentModalViewController:myViewController animated:NO];
CATransition *animation = [CATransition animation];
[animation setDuration:0.5];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromRight];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[myViewController.view layer] addAnimation:animation forKey:@"SwitchToView"];

但问题是，它显示空白屏幕，然后开始转换。如何避免这种情况？

【问题讨论】：

标签： iphone uiviewcontroller transition

【解决方案1】：

先加动画再呈现

CATransition *animation = [CATransition animation];
[animation setDuration:0.5];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromRight];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[myViewController.view layer] addAnimation:animation forKey:@"SwitchToView"];  


[self presentModalViewController:myViewController animated:NO];

【讨论】：

当我这样做时，视图来自右下角。但我想要一个和导航控制器类似的。（但我的应用中没有导航控制器，我们不想实现它）
对我来说它从右到左出现但仍然是白色背景:-(
我在展示MFMailComposeViewController 时使用了这种技术，但是它在某些时候停止了正常工作，可能是iOS6。您可以在模拟器中看到它，起始视图的副本从右向左滑动，最后新视图才出现。我试过controller.view.layer、controller.view.superview.layer 和controller.view.window.layer 和同样的东西。我想知道这是我的应用程序的普遍问题还是奇怪的问题，无论哪种方式我都放弃了自定义转换。

【解决方案2】：

由于没有人回答，我将发布对我有用的内容，让未来的寻求者找到有用的东西：

我试图用 CATransition 在不同的 XIB 文件中显示视图，但一开始总是黑屏。

解决方案是替换这些行

[[myViewController.view layer];
addAnimation:animation forKey:@"SwitchToView"];

与

[[self.view.superview layer] addAnimation:animation forKey:@"SwitchToView"];

找到问题后，就很容易理解了，因为很明显本地窗口就是你要“推送”的窗口。

【讨论】：

【解决方案3】：

我认为，uiviewcontroller.transitioningDelegate 是在 iOS7 ans 8 上执行此操作的方法：

//Mark : Custom Transitionning for modal
func presentViewController(viewControllerToPresent: UIViewController, animated flag: Bool, fromRight:Bool , completion: (() -> Void)?) {
    if fromRight
    {
        viewControllerToPresent.modalPresentationStyle = UIModalPresentationStyle.FullScreen
        viewControllerToPresent.transitioningDelegate = self;
        self.presentViewController(viewControllerToPresent, animated: true, completion: completion);
    }
    else
    {
        self.presentViewController(viewControllerToPresent, animated: true, completion: completion)
    }
}


//MARK : Transitioning Delegate
func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return self;
}

func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    return self;
}

func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
    return 0.4;
}

func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

    let toViewController = transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!
    let fromViewController = transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!
    let toView = toViewController.viewForTransitionContext(transitionContext)
    let fromView = fromViewController.viewForTransitionContext(transitionContext)
    let containerView = transitionContext.containerView()
    let duration = self.transitionDuration(transitionContext);

    let initialFrame = transitionContext.initialFrameForViewController(fromViewController)
    var offsetRect = initialFrame
    offsetRect.origin.x += CGRectGetWidth(initialFrame);

    //Present
    if toViewController.isBeingPresented()
    {
        // init state before animation
        toView.frame = offsetRect;
        containerView.addSubview(toView);
        // then animate
        UIView.animateWithDuration(duration, animations: { () -> Void in
            toView.frame = initialFrame;
            }, completion: { (finished) -> Void in
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
        })

    }
    //Dismiss
    else
    {
        // init state before animation
        containerView.addSubview(toView)
        containerView.sendSubviewToBack(toView)
        // then animate
        UIView.animateWithDuration(duration, animations: { () -> Void in
            fromView.frame = offsetRect
            }, completion: { (finished) -> Void in
                fromView.removeFromSuperview()
                transitionContext.completeTransition(!transitionContext.transitionWasCancelled())
        })
    }
}

【讨论】：