我正在尝试创建缩放过渡。当它用于＆＃34;推动时，我的工作完全正常。现在我需要为模态转换工作，当然它不能只是一个2分钟的修复。
转换是从一个NavigationController到另一个ViewController。我仍然不明白NavigationControllers键何时指向ViewControllers，他们应该指向实际的viewWillAppear？
这完全符合我的要求，但所提供的控制器上的NavigationBar永远不会被调用，-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
UINavigationController *fromNav = (id)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UINavigationController *toNav = (id)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController<SWZoomTransitionDelegate> *fromVC= (UIViewController<SWZoomTransitionDelegate> *)fromNav.topViewController;
UIViewController <SWZoomTransitionDelegate> *toVC = (UIViewController<SWZoomTransitionDelegate> *)toNav.topViewController;
UIView * containerView = [transitionContext containerView];
UIView * fromView = [fromVC view];
UIView * toView = [toVC view];
[containerView addSubview:toView];
UIView * zoomFromView = [fromVC viewForZoomTransition];
UIView * zoomToView = [toVC viewForZoomTransition];
UIImageView * animatingImageView = [self initialZoomSnapshotFromView:zoomFromView
destinationView:zoomToView];
if ([fromVC respondsToSelector:@selector(initialZoomViewSnapshotFromProposedSnapshot:)])
{
animatingImageView = [fromVC initialZoomViewSnapshotFromProposedSnapshot:animatingImageView];
}
animatingImageView.frame = [zoomFromView.superview convertRect:zoomFromView.frame
toView:containerView];
fromView.alpha = 1;
toView.alpha = 0;
zoomFromView.alpha = 0;
zoomToView.alpha = 0;
[containerView addSubview:animatingImageView];
ZoomAnimationBlock animationBlock = nil;
if ([fromVC respondsToSelector:@selector(animationBlockForZoomTransition)])
{
animationBlock = [fromVC animationBlockForZoomTransition];
}
[UIView animateKeyframesWithDuration:self.transitionDuration
delay:0
options:self.transitionAnimationOption
animations:^{
animatingImageView.frame = [zoomToView.superview convertRect:zoomToView.frame toView:containerView];
fromView.alpha = 0;
toView.alpha = 1;
if (animationBlock)
{
animationBlock(animatingImageView,zoomFromView,zoomToView);
}
} completion:^(BOOL finished) {
if ([transitionContext transitionWasCancelled]) {
[toView removeFromSuperview];
[transitionContext completeTransition:NO];
zoomFromView.alpha = 1;
} else {
[fromView removeFromSuperview];
[transitionContext completeTransition:YES];
zoomToView.alpha = 1;
}
[animatingImageView removeFromSuperview];
}];
}
也不会出现。
请帮帮我。我会尽我所能来回答这个问题！
这是动画方法：
{{1}}
答案 0 :(得分：0)
我和另一个项目有类似的问题。根据{{3}}：
，调用viewWillAppear:绝对是预期的行为
因此，当互动转换开始时，UIKit背后的机器实际上将会调出视图，视图将消失，将显示视图控制器，所有你通常习惯的东西控制你的应用程序中发生的事情，因为屏幕上和屏幕外都有。
就我而言，问题是动画师对象在转换过程中被取消分配。我正在设置这样的动画师：
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
presentingController:(UIViewController *)presenting
sourceController:(UIViewController *)source {
AGBAnimator *animator = [AGBAnimator new];
return animator;
}
此对象超出范围并在动画期间取消分配。通过创建strong属性并在从此方法返回之前为其分配animator，问题已得到解决，viewWillAppear:等已成功调用。