- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

Thread 1, Queue : com.apple.main-thread
#0  0x3a80cb66 in objc_msgSend ()
#1  0x32e23f9a in -[UIGestureRecognizer _delegateCanPreventGestureRecognizer:] ()
#2  0x32cce418 in -[UIGestureRecognizer _isExcludedByGesture:] ()
#3  0x32c9410e in _UIGestureRecognizerUpdate ()
#4  0x32ccd1b4 in -[UIWindow _sendGesturesForEvent:] ()
#5  0x32cccb62 in -[UIWindow sendEvent:] ()
#6  0x32ca1f58 in -[UIApplication sendEvent:] ()
#7  0x32ca0746 in _UIApplicationHandleEventQueue ()
#8  0x304e2f26 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ ()
#9  0x304e23ee in __CFRunLoopDoSources0 ()
#10 0x304e0bde in __CFRunLoopRun ()
#11 0x3044b540 in CFRunLoopRunSpecific ()
#12 0x3044b322 in CFRunLoopRunInMode ()
#13 0x351822ea in GSEventRunModal ()
#14 0x32d021e4 in UIApplicationMain ()
#15 0x000df478 in main at /path/to/main.m:17
#16 0x000df398 in start ()

self.navigationController.interactivePopGestureRecognizer.delegate = nil;