gistfile1.m

UITouch *touch = [touches anyObject];
CGPoint currentPosition = [touch locationInView:[self view]];

CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x);
CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y);
	
if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) {
	[label setText:@"Horizontal swipe detected"];
	[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
} else if (deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance) {
	[label setText:@"Vertical swipe detected"];
	[self performSelector:@selector(eraseText) withObject:nil afterDelay:2];
}