这个视频显示了我遇到的问题.
http://www.youtube.com/watch?v=C9od_2KZAbs
http://www.youtube.com/watch?v=C9od_2KZAbs
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)和一个过渡动画师. completeTransition：似乎不必要地重新动画推动.
以下是平移手势如何控制转换：
- (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销售,这是在pushViewController：被调用时触发的.
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,平移手势结束大约60％的方式,触发finishInteractiveTransition调用.一切都顺利进行,直到UIView基于块的动画中的完成块调用completeTransition：.调用此方法时,toViewController将不必要地重新动画推送动画的最后部分.在视频中,红色视图是窗口.动画持续时间为3秒.
我不知道为什么会发生这种情况.看起来像手势结束点之间的动画和completeTransition：被调用发生两次.有任何想法吗？
