此视频显示了我遇到的问题 . http://www.youtube.com/watch?v=C9od_2KZAbs
我正在尝试使用UIPanGestureRecognizer创建自定义推送交互式转换 . 我有一个交互式转换委托(使用UIPercentDrivenInteractiveTransition)和一个过渡动画师 .
以下是平移手势控制转换的方式:
- (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;
}
}
UINavigationControllerDelegate处理两个转换委托对象的自动售货,这是在调用pushViewController:时触发的 .
过渡动画师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];
}];
}
}
在视频中,平移手势大约结束了60%,这触发了finishInteractiveTransition调用 . 一切顺利,直到UIView基于块的动画中的完成块调用completeTransition: . 调用此方法时,toViewController将不必要地重新设置推送动画的最后一部分 . 在视频中,红色视图是窗口 . 动画持续时间为3秒 .
我无法弄清楚为什么会这样 . 它看起来像是手势结束时和动作完成传递之间的动画发生两次 . 有任何想法吗?
4 回答
从iOS 7.1开始,我可以在模拟器中重现这一点,但不能在实际设备上重现 . 无论如何,似乎有一个解决方法:
这个bug有一个雷达:rdar://14675246
如果在调用
finishInteractiveTransition
之后立即调用[transitionContext completeTransition:YES];
会发生什么:我有一个例子on github没有故障 . 如果您有其他问题,请与我们联系 .
或者,当matt观察到here时,您也可以推迟
completeTransition
或自己驱动自定义交互控制器: