ZLSwipeable view top and bottom swipe disabling

[shijilkadambath]

how can i limit ZLSwipeableView top and bottom location value ,which should allows ZLswipeable view not go further top or bottom of its super view .i try to use the code location.y=100 in - (void)handlePan:(UIPanGestureRecognizer *)recognizer method but the swipe is limited in some angular position only