iOS 7仅在某些时候使用自定义交互式过渡 [英] iOS 7 use custom interactive transitions only some of the time

问题描述

所以我有一个UINavigationController，控制器A作为根控制器。

So I have a UINavigationController, with Controller A as the root controller.

当我想将控制器B放在最顶层时，我想使用自定义动画过渡和自定义交互式转换。这很好。

When I want to push Controller B on top, I want to use a custom animated transition and a custom interactive transition. This works fine.

当我想将控制器C推到最顶层时，我想回到 默认 UINavigationController附带的推/弹转换。为了实现这一点，我返回nil for

When I want to push Controller C on top, I want to fall back to the default push/pop transitions that comes with UINavigationController. To make this happen I return nil for

navigationController:animationControllerForOperation:fromViewController:toViewController:

但是如果你返回nil，那么

however if you return nil, then

navigationController:interactionControllerForAnimationController:

将永远不会被调用，默认的从左边缘平移弹出交互式转换不会不行。

will never be called and the default "pan from left edge" pop interactive transition doesn't work.

有没有办法返回默认的推/动画动画控制器和交互控制器？
（是否有具体的 id< UIViewControllerAnimatedTransitioning> 和 id< UIViewControllerInteractiveTransitioning> ？）

Is there a way to return the default push/pop animation controller and interaction controller? (Are there concrete implementations of id<UIViewControllerAnimatedTransitioning> and id<UIViewControllerInteractiveTransitioning>?)

还是其他一些方式？

推荐答案

你应该将NavigationController的interactivePopGestureRecognizer委托设置为自我然后在-gestureRecognizerShouldBegin中处理它的行为：

You should set NavigationController's interactivePopGestureRecognizer delegate to self and then handle its behavior in -gestureRecognizerShouldBegin:

也就是说，当你想要触发内置的pop手势时，你必须从这个方法返回YES。你的自定义手势也一样 - 你必须找出你正在处理的识别器。

That is, when you want the built-in pop gesture to fire, you must return YES from this method. The same goes for your custom gestures - you have to figure out which recognizer you are dealing with.

- (void)setup
{
    self.interactiveGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleTransitionGesture:)];
    self.interactiveGestureRecognizer.delegate = self;
    [self.navigationController.view addGestureRecognizer:self.interactiveGestureRecognizer];

    self.navigationController.interactivePopGestureRecognizer.delegate = self;
}

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    // Don't handle gestures if navigation controller is still animating a transition
    if ([self.navigationController.transitionCoordinator isAnimated])
        return NO;

    if (self.navigationController.viewControllers.count < 2)
        return NO;

    UIViewController *fromVC = self.navigationController.viewControllers[self.navigationController.viewControllers.count-1];
    UIViewController *toVC = self.navigationController.viewControllers[self.navigationController.viewControllers.count-2];

    if ([fromVC isKindOfClass:[ViewControllerB class]] && [toVC isKindOfClass:[ViewControllerA class]])
    {
        if (gestureRecognizer == self.interactiveGestureRecognizer)
            return YES;
    }
    else if (gestureRecognizer == self.navigationController.interactivePopGestureRecognizer)
    {
        return YES;
    }

    return NO;
}

您可以查看示例项目。视图控制器A和B之间的过渡是自定义动画，具有自定义B-> A弹出手势。视图控制器B和C之间的转换是默认的，具有内置导航控制器的弹出手势。

You can check out a sample project for your scenario. Transitions between view controllers A and B are custom animated, with custom B->A pop gesture. Transitions between view controllers B and C are default, with built-in navigation controller's pop gesture.

希望这有帮助！

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