UIPanGestureRecognizer - determine direction

gistfile1.m

CGPoint velocity = [gestureRecognizer velocityInView:currentView];
                            if (velocity.x * lastGestureVelocity.x + velocity.y * lastGestureVelocity.y > 0) {
                                //NSLog(@"gesture went in same direction");
                            }
                            else {
                                NSLog(@"gesture went in opposite direction");
                            }
                            lastGestureVelocity = velocity;