swipe distance in iphone sdk?

Through swipe gesture, is it possible to cal开发者_开发知识库culate the distance of swipe (up, down, left, right)?

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- (CGFloat)distanceBetweenTwoPoints:(CGPoint)fromPoint toPoint:(CGPoint)toPoint

{
float x = toPoint.x - fromPoint.x;
float y = toPoint.y - fromPoint.y;
return sqrt(x * x + y * y);
}

Hope its help you, just pass starting and endpoint to this method ....

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I've used an approach similar to this article to recognise swipe gestures of a certain number of pixels, but if you're using a base SDK of at least 4 try using UISwipeGestureRecognizer which can make it much easier; see this post.