ViewController not active after cancelInteractiveTransition?

Question

Objective-C

I'm trying to make the transition like in the Mail app on iOS8, that is, the new letter window can be swiped down and continue working on the first screen. This transition works fine, but the problem is that when the second window is at the bottom, the first controller is not active, does not respond to clicks. To solve this problem, in the method I startInteractiveTransition:did

[containerView insertSubview:nonModalVC.view belowSubview:modalVC.view];

: Which is not good to do, but with this approach, in the "collapsed" state, nonModalVC reacts to clicks. However, now only a black screen remains on finishInteractiveTransition. Has anyone experienced this? Or using Transitioning in principle it is impossible to achieve what I want?
Below is my code:

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
                                                                   presentingController:(UIViewController *)presenting
                                                                   sourceController:(UIViewController *)source {
    return self;
}

- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
    return self;
}

- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForPresentation:(id <UIViewControllerAnimatedTransitioning>)animator{
    return  nil;
}

- (id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator{
    return self;
}

#pragma mark - UIViewControllerInteractiveTransitioning

- (void)startInteractiveTransition:(id <UIViewControllerContextTransitioning>)transitionContext {

    self.transitionContext = transitionContext;

    UIViewController *modalVC = [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *nonModalVC = [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIView *containerView = [self.transitionContext containerView];
    [containerView insertSubview:nonModalVC.view belowSubview:modalVC.view];

    [self updateInteractiveTransition:0.0];
} 

#pragma mark - UIPercentDrivenInteractiveTransition

- (void)updateInteractiveTransition:(CGFloat)percentComplete{

    if (percentComplete < 0) {
        percentComplete = 0;
    }
    else if (percentComplete > 1){
        percentComplete = 1;
    }

    UIViewController *modalVC = [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *nonModalVC = [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    float scaleFactor = 0.9 + 0.1 * percentComplete;
    float alphaVal = 0.5 + 0.5 * percentComplete;
    nonModalVC.view.transform = CGAffineTransformScale(CGAffineTransformIdentity, scaleFactor, scaleFactor);
    nonModalVC.view.alpha = alphaVal;


    CGRect modalVCFrame = modalVC.view.frame;
    modalVCFrame.origin.y = percentComplete * viewH + kModalViewYOffset;
    modalVC.view.frame = modalVCFrame;
}

- (void)cancelInteractiveTransitionWithDuration:(CGFloat)duration{

    UIViewController *modalVC = [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *nonModalVC = [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    CGRect modalVCFrame = modalVC.view.frame;
    modalVCFrame.origin.y = self.cancelUp ? kModalViewYOffset : viewH - kModalViewNavBarHeight;
    NSLog(@"modalVCFrame.origin.y = %f", modalVCFrame.origin.y);
    CGAffineTransform transformVal = self.cancelUp ?
                                                CGAffineTransformMakeScale(kNonModalViewMinScale, kNonModalViewMinScale)
                                                : CGAffineTransformIdentity;
    CGFloat alphaVal = self.cancelUp ? 0.5 : 1.0;

    [UIView animateWithDuration:duration animations:^{
        modalVC.view.frame = modalVCFrame;
        nonModalVC.view.transform = transformVal;
        nonModalVC.view.alpha = alphaVal;
    } completion:^(BOOL finished) {
        [self cancelInteractiveTransition];
    }];

    reversed = NO;
}


- (void)finishInteractiveTransitionWithDuration:(CGFloat)duration{

    UIViewController *modalVC = [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    UIViewController *nonModalVC = [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];

    CGRect modalVCFrame = modalVC.view.frame;
    modalVCFrame.origin.y = viewH ; //+ kModalViewNavBarHeight;

    [UIView animateWithDuration:duration animations:^{
        modalVC.view.frame = modalVCFrame;
        nonModalVC.view.transform = CGAffineTransformIdentity;
        nonModalVC.view.alpha = 1.0;
    } completion:^(BOOL finished) {

        [modalVC.view removeFromSuperview];
        [self.transitionContext completeTransition:YES];
        self.transitionContext = nil;

        [self finishInteractiveTransition];

    }];

    reversed = NO;
}

Answer 1

Solved a problem. The first is to not add anything to the containerView during dismissing. Second - I made a UIView category and rewrote the method hitTest:withEvent:so that it "passes" clicks through itself when the modal window is "minimized".