I am using custom view controller transitions, UIViewControllerAnimatedTransitioning
, to present and dismiss a view controller.
The presenting animation works fine, but when I run the dismiss animation, once I call completeTransition:
the containerView
gets removed.
I'm not sure what is going on, here is the transition code:
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *containerView = [transitionContext containerView];
containerView.backgroundColor = [UIColor blackColor];
if (self.reverse) {
[containerView addSubview:toViewController.view];
[containerView addSubview:fromViewController.view];
} else {
[containerView addSubview:fromViewController.view];
[containerView addSubview:toViewController.view];
}
if (! self.reverse) { // Forward
toViewController.view.frame = CGRectMake(-containerView.frame.size.width, 0, containerView.frame.size.width, containerView.frame.size.height);
} else {
fromViewController.view.frame = CGRectMake(0, 0, containerView.frame.size.width, containerView.frame.size.height);
}
[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0 usingSpringWithDamping:0.75f initialSpringVelocity:1.0f options:UIViewAnimationOptionCurveLinear animations:^{
if (self.reverse) {
fromViewController.view.frame = CGRectMake(-containerView.frame.size.width, 0, containerView.frame.size.width, containerView.frame.size.height);
fromViewController.view.layer.opacity = 0.f;
toViewController.view.layer.opacity = 1.f;
} else {
toViewController.view.frame = CGRectMake(0, 0, containerView.frame.size.width, containerView.frame.size.height);
toViewController.view.layer.opacity = 1.f;
fromViewController.view.layer.opacity = 0.3f;
}
} completion:^(BOOL finished) {
[transitionContext completeTransition:finished];
}];
}
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
if (self.reverse) {
return 0.45;
} else {
return 0.35;
}
}
How can I prevent my toViewController
from disappearing if .reverse
is set to YES
?
Update: This is how I'm presenting the view controller:
SecondaryViewController *vc = [[SecondaryViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:vc];
navigationController.modalPresentationStyle = UIModalPresentationCustom;
navigationController.transitioningDelegate = self;
[self presentViewController:navigationController animated:YES completion:nil];
The container view disappearing on dismissal is correct behavior. Your mistake is adding the fromView
to it.
You are incorrectly distinguishing whether this is presentation or dismissal and what you should do in each case. Simply use the two view controllers fromViewController
and toViewController
to tell them apart; on dismissal, the roles are reversed. On dismissal, do not add anything to the content view; the original presenter is still present and will be revealed by the removal of the container view.
So, on presentation, add only the toView
to the container view. On dismissal, do not add anything to the container view. It's as simple as that.
My solution is setting modalPresentationStyle = .custom
. It can be before or after the line transitioningDelegate = self
.
TLDR:
This discussion regards to presenting transition only, because I didn't have much issue with dismissing transition.
My modal view is smaller than the screen and the presenting view is supposed to be shown in the background. But no, I got a totally black background instead of the presenting view as soon as transitionContext.completeTransition
is called. I have a similar modal view with the presenting view in the background somewhere else in code, and it's totally working. After doing some comparison I eliminate all the other possibilities and narrow down to the difference of modalPresentationStyle = .custom
, which has .fullScreen
for the default value. I guess .fullScreen
assumes the presented view takes full screen and decide to remove the presenter view (fromView
) regardlessly.
One thing interesting with modalPresentationStyle = .custom
: transitionContext.view(forKey: .from)
returns nil
while transitionContext.viewController(forKey: .from)
still returns the presenting view controller.
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