“ From View Controller”使用 UIViewController 上下文转换消失
我有一个问题，我在下面描述了它。
我使用 UIViewControllerContextTransitioning自定义过渡。
我有两个视图控制器，第一个视图控制器和第二个视图控制器。
现在我想在第一个视图控制器上添加第二个视图控制器和一个动画。我已经做到了，现在第二视图控制器是透明的，所以我们可以看到第一视图控制器下面的第二视图控制器。
但是我看不到第一个视图控制器，我只能看到第二个视图控制器下面的黑色屏幕。
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
self.transitionContext = transitionContext;
if(self.isPresenting){
[self executePresentationAnimation:transitionContext];
}
else{
[self executeDismissalAnimation:transitionContext];
}
}
-(void)executePresentationAnimation:(id<UIViewControllerContextTransitioning>)transitionContext{
UIView* inView = [transitionContext containerView];
UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
CGRect offScreenFrame = inView.frame;
offScreenFrame.origin.y = inView.frame.size.height;
toViewController.view.frame = offScreenFrame;
toViewController.view.backgroundColor = [UIColor clearColor];
fromViewController.view.backgroundColor = [UIColor clearColor];
inView.backgroundColor = [UIColor clearColor];
[inView insertSubview:toViewController.view aboveSubview:fromViewController.view];
// [inView addSubview:toViewController.view];
CFTimeInterval duration = self.presentationDuration;
CFTimeInterval halfDuration = duration/2;
CATransform3D t1 = [self firstTransform];
CATransform3D t2 = [self secondTransformWithView:fromViewController.view];
[UIView animateKeyframesWithDuration:halfDuration delay:0.0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{
[UIView addKeyframeWithRelativeStartTime:0.0f relativeDuration:0.5f animations:^{
fromViewController.view.layer.transform = t1;
}];
[UIView addKeyframeWithRelativeStartTime:0.5f relativeDuration:0.5f animations:^{
fromViewController.view.layer.transform = t2;
}];
} completion:^(BOOL finished) {
}];
[UIView animateWithDuration:duration delay:(halfDuration - (0.3*halfDuration)) usingSpringWithDamping:0.7f initialSpringVelocity:6.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
toViewController.view.frame = inView.frame;
} completion:^(BOOL finished) {
[self.transitionContext completeTransition:YES];
}];
}
当 [self.transitionContext completeTransition:YES];调用时，第一个视图控制器突然消失，黑屏显示在第二个视图控制器下面。
有人知道吗？ 谢谢。
最佳答案