此视频显示我遇到的问题。 http://www.youtube.com/watch?v=C9od_2KZAbsiOS 7使用UINavigationController自定义转换
我正在尝试使用UIPanGestureRecognizer创建自定义交互式推送转换。我有一个交互式转换委托(使用UIPercentDrivenInteractiveTransition)和一个转换动画师。 completeTransition:似乎不必要地重新推动推动。
这里是移动手势如何控制过渡:
- (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;
}
}
的UINavigationControllerDelegate同时处理过渡委托对象,这是当pushViewController触发的自动售货机:被调用。
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,泛手势结束的通过的方式,这会触发finishInteractiveTransition呼叫约60%。一切顺利,直到UIView基于块的动画中的完成块调用completeTransition :.当调用此方法时,toViewController会不必要地重新动画推动动画的最后部分。在视频中,红色视图是窗口。动画持续时间是3秒。
我不明白为什么会发生这种情况。它看起来像手势结束时和completeTransition:被调用两次之间的动画。有任何想法吗?
哇谢谢你! –