A receiver of dismiss may be not visible (current) view controller

CrossNavigation/CNViewController.h

@@ -59,6 +59,8 @@
 /**
  Dismisses a view controller that was presented modally by a receiver in a defined direction.
 
+ If a receiver is not a last view controller in a stack, it dismisses all subsequent view controllers. So when animation is finished, the receiver becomes a visible view controller. A transition occurs from the visible view controller to the receiver.
+
  @param direction Determines in what direction view controller will be dismissed
  @param animated Determines whether the view controller will be dismissed animated or not
  @param completion The block to execute after the view controller is dismissed. May be nil.

CrossNavigation/CNViewController.m

@@ -26,6 +26,7 @@
 #import "CNInteractiveTransition.h"
 #import "CNPanGestureHandler.h"
 #import "CNTimer.h"
+#import <QuartzCore/QuartzCore.h>
 
 @interface CNViewController () <CNPanGestureHandlerDelegate>
 
@@ -102,6 +103,7 @@ - (void)dismissViewControllerToDirection:(CNDirection)direction
     }
 
     if (self.presentedViewController) {
+        // rather tricky case since default behaviour is buggy
         [self dismissInvisibleViewControllerToDirection:direction animated:animated completion:completion];
     } else {
         [self dismissVisibleViewControllerToDirection:direction animated:animated completion:completion];
@@ -324,36 +326,67 @@ - (void)dismissVisibleViewControllerToDirection:(CNDirection)direction
     [super dismissViewControllerAnimated:animated completion:completion];
 }
 
+// this method is quite tricky
+// 
 - (void)dismissInvisibleViewControllerToDirection:(CNDirection)direction
                                           animated:(BOOL)animated
                                         completion:(void (^)(void))completion
 {
-    // params
-    NSMutableDictionary *params = [NSMutableDictionary new];
-    params[@"animated"] = @(animated);
-
-    if (completion) {
-        params[@"completion"] = completion;
-    }
+    // - Now let's do some magic!
 
-    // visible view controller
+    // a visible view controller
     CNViewController *visibleViewController = (CNViewController *)[self visibleViewController];
 
-    // do some magic
+    // freeze UI (we need this to avoid a blinking during further operations)
+    UIView *frozenView = [self freezeUI];
+
+    // dismiss all subsequent view controllers in a stack
     [self dismissVisibleViewControllerToDirection:CNDirectionNone animated:NO completion:^{
 
+        // present a previously visible view controller
         [self presentViewController:visibleViewController direction:CNDirectionGetOpposite(direction) animated:NO completion:^{
 
-            [visibleViewController performSelector:@selector(dismissWithParams:) withObject:params afterDelay:0.0f];
+            // at this point a receiver is followed by the visible view controller (all intermediate view controllers are removed, if had existed)
+
+            // unfreeze UI
+            [frozenView removeFromSuperview];
+
+            // dismiss params
+            NSDictionary *dismissParams = [self createParamsForDismissAnimated:animated completion:completion];
+
+            // make a common dismiss
+            [visibleViewController performSelector:@selector(dismissWithParams:) withObject:dismissParams afterDelay:0.0f];
         }];
     }];
 }
 
+- (UIView *)freezeUI
+{
+    UIWindow *window = [UIApplication sharedApplication].keyWindow;
+    UIImageView *imageView = [[UIImageView alloc] initWithImage:[self imageWithView:window]];
+    imageView.frame = window.bounds;
+    [window addSubview:imageView];
+    return imageView;
+}
+
 - (void)dismissWithParams:(NSDictionary *)params
 {
     [self dismissViewControllerAnimated:[params[@"animated"] boolValue] completion:params[@"completion"]];
 }
 
+- (NSDictionary *)createParamsForDismissAnimated:(BOOL)animated completion:(void (^)(void))completion
+{
+    // params
+    NSMutableDictionary *params = [NSMutableDictionary new];
+    params[@"animated"] = @(animated);
+
+    if (completion) {
+        params[@"completion"] = completion;
+    }
+
+    return params;
+}
+
 - (UIViewController *)visibleViewController
 {
     UIViewController *viewController = self;
@@ -455,4 +488,16 @@ - (NSString *)storyboardIDForPanDirection:(CNDirection)direction
     }
 }
 
+- (UIImage *)imageWithView:(UIView *)view
+{
+    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
+
+    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+
+    UIGraphicsEndImageContext();
+
+    return image;
+}
+
 @end

Demo/CrossNavigationDemo/LastViewController.m

@@ -17,7 +17,7 @@ @implementation LastViewController
 - (IBAction)restartDidPress:(id)sender
 {
     CNViewController *firstViewController = (CNViewController *)self.presentingViewController.presentingViewController;
-    [firstViewController dismissViewControllerToDirection:CNDirectionTop animated:YES completion:nil];
+    [firstViewController dismissViewControllerToDirection:CNDirectionLeft animated:YES completion:nil];
 }
 
 @end