iOS 7与UINavigationController的自定义转换

这段视频显示了我遇到的问题。

我正在尝试使用UIPangestureRecognitor创建自定义交互式推送转换。我有一个交互式过渡代理（使用UIPercentDrivenInteractiveTransition）和一个过渡动画师。completeTransition：似乎重新设置了不必要的推送动画

以下是平移手势如何控制过渡：

- (void) panGestureRecognized:(UIPanGestureRecognizer *) gestureRecogznier {

    CGPoint translation = [gestureRecogznier translationInView:gestureRecogznier.view];

    if (gestureRecogznier.state == UIGestureRecognizerStateBegan) {

        self.interactiveTransitionAnimator = [[UIPercentDrivenInteractiveTransition alloc] init];

        EVDetailViewController *detailViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"EVDetailViewController"];
        [self.navigationController pushViewController:detailViewController animated:YES];
    }
    else if (gestureRecogznier.state == UIGestureRecognizerStateChanged) {

        CGFloat d = (translation.x / CGRectGetWidth(self.view.bounds)) * -1;
        [self.interactiveTransitionAnimator updateInteractiveTransition:d];
    }
    else if (gestureRecogznier.state == UIGestureRecognizerStateEnded) {

        if ([gestureRecogznier velocityInView:self.view].x < 0) {
            [self.interactiveTransitionAnimator finishInteractiveTransition];
        } else {
            [self.interactiveTransitionAnimator cancelInteractiveTransition];
        }

        self.interactiveTransitionAnimator = nil;
    }
}

-（void）PangestureRecognited:（UIPangestureRecognitizer*）手势识别器{
CGPoint translation=[gestureRecogznier translationView:gestureRecogznier.view]；
if（gestureRecogznier.state==UIgestureRecognizerStateStart）{
self.interactiveTransitionAnimator=[[UIPercentDriventerActivityTransition alloc]init]；
EVDetailViewController*detailViewController=[self.storyboard实例化EVEWCONTROLLER WITHIDER:@“EVDetailViewController”]；
[self.navigationController pushViewController:detailViewController动画：是]；
}
else if（gestureRecogznier.state==UIGestureRecognizerStateChanged）{
CGFloat d=（translation.x/CGRectGetWidth（self.view.bounds））*-1；
[self.interactiveTransitionAnimator updateInteractiveTransition:d]；
}
else if（gestureRecogznier.state==UIGestureRecognizerStateEnded）{
if（[gestureRecogznier velocityInView:self.view].x<0）{
[self.interactiveTransitionAnimator finishInteractiveTransition]；
}否则{
[self.interactiveTransitionAnimator cancelInteractiveTransition]；
}
self.interactiveTransitionAnimator=nil；
}
}

UINavigationControllerDelegate处理两个转换代理对象的出售，这在调用pushViewController:时触发

“transition animator”有一个非常简单的动画：

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {

    UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    [[transitionContext containerView] addSubview:toViewController.view];

    CGRect finalToVCFrame = [transitionContext finalFrameForViewController:toViewController];

    if (self.operation == UINavigationControllerOperationPush) {

        // set offscreen to the right
        toViewController.view.frame = CGRectMake(320.0f, 0.0f, 320.0f, 568.0f);

        [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0f options:0 animations:^{

            toViewController.view.frame = finalToVCFrame;

        } completion:^(BOOL finished) {

            // *** When this is called, the glitch occurs
            [transitionContext completeTransition:YES];
        }];
    }
}

-（void）animateTransfion:（id）transitionContext{
UIViewController*toViewController=[transitionContext ViewControllerWorky:UITransitionContextToViewControllerKey]；
[[transitionContext containerView]添加子视图：toViewController.view]；
CGRect finalToVCFrame=[transitionContext finalFrameForViewController:toViewController]；
if（self.operation==UINavigationControllerOperationPush）{
//将屏幕外设置为右侧
toViewController.view.frame=CGRectMake（320.0f、0.0f、320.0f、568.0f）；
[UIView animateWithDuration:[self-transitionDuration:transitionContext]延迟：0.0f选项：0个动画：^{
toViewController.view.frame=finalToVCFrame；
}完成：^（布尔完成）{
//***调用此命令时，会出现故障
[transitionContext completeTransition:是]；
}];
}
}

在视频中，平移手势结束了大约60%的行程，这将触发finishInteractiveTransition调用。一切都会顺利进行，直到基于UIView块的动画中的完成块调用completeTransition:。调用此方法时，toViewController会不必要地重新设置推送动画最后一部分的动画。在视频中，红色视图是窗口。动画持续时间为3秒

---

我不明白为什么会这样。它看起来像是手势结束和调用completeTransition:之间的动画发生了两次。有什么想法吗？

找到了一个可行的解决办法

增加

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
        [transitionContext completeTransition:![transitionContext transitionWasCancelled]];
    });

在您的完成处理程序中

对我有用