I think the proper way to get the direction is through the velocity.

Relying on translation can cause a delay in catching the interaction.
Also related to Issue 9.

Author: devangmundhra

InteractionControllers/CEHorizontalSwipeInteractionController.m

@@ -38,17 +38,12 @@ - (CGFloat)completionSpeed
 
 - (void)handleGesture:(UIPanGestureRecognizer*)gestureRecognizer {
     CGPoint translation = [gestureRecognizer translationInView:gestureRecognizer.view.superview];
+    CGPoint vel = [gestureRecognizer velocityInView:gestureRecognizer.view];
 
     switch (gestureRecognizer.state) {
         case UIGestureRecognizerStateBegan: {
 
-            // if the user performs a *very* slow swipe, the initiatlly returned x translation may be zero. This means
-            // that we cannot effectively determine which direction the swipe is, so we just
-            // ignore this interaction.
-            if (translation.x == 0)
-                break;
-            
-            BOOL rightToLeftSwipe = translation.x < 0;
+            BOOL rightToLeftSwipe = vel.x < 0;
 
             // perform the required navigation operation ...