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    <p>On UIPanGestureRecognizer you can use <a href="http://developer.apple.com/library/ios/documentation/uikit/reference/UIPanGestureRecognizer_Class/Reference/Reference.html#//apple_ref/occ/instm/UIPanGestureRecognizer/velocityInView%3a">-velocityInView:</a> to get the velocity of the fingers at the time that gesture was recognised.</p> <p>If you wanted to do one thing on a pan right and one thing on a pan left, for example, you could do something like:</p> <pre><code>- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer { CGPoint velocity = [gestureRecognizer velocityInView:yourView]; if(velocity.x &gt; 0) { NSLog(@"gesture went right"); } else { NSLog(@"gesture went left"); } } </code></pre> <p>If you literally want to detect a reversal, as in you want to compare a new velocity to an old one and see if it is just in the opposite direction — whichever direction that may be — you could do:</p> <pre><code>// assuming lastGestureVelocity is a class variable... - (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer { CGPoint velocity = [gestureRecognizer velocityInView:yourView]; if(velocity.x*lastGestureVelocity.x + velocity.y*lastGestureVelocity.y &gt; 0) { NSLog(@"gesture went in the same direction"); } else { NSLog(@"gesture went in the opposite direction"); } lastGestureVelocity = velocity; } </code></pre> <p>The multiply and add thing may look a little odd. It's actually a dot product, but rest assured it'll be a positive number if the gestures are in the same direction, going down to 0 if they're exactly at right angles and then becoming a negative number if they're in the opposite direction.</p>
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    1. POHow can I capture which direction is being panned using UIPanGestureRecognizer?
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    1. COWow! Way above and beyond the call of duty. That answer is exactly what I needed!!! Thanks Tommmy!
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    2. COJust what I was looking for! Thanks! :)
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    3. COGreat bit of code!
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      1. USAlex McPherson
 

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