StackOverflow2013

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PO
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Id
19431932
data
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0
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2013-10-17T16:14:09.837
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2013-10-17T16:14:09.837
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Score
15
ViewCount
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LastEditorDisplayName
text
Body
I had a bit of a hard time for this problem. The accepted answer wasn't enough. No matter what I put in that method the pan or longpress handlers would get invoked. A solution I found was as follows: <ol> <li>Ensure the gesture recognizers' delegates are assigned to the same class (in my case self) and ensure the delegate class is a <code>UIGestureRecognizerDelegate</code>.</li> <li>Add the following delegate method to your class (as per the answer above): <pre><code>- (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { return YES; } </code></pre></li> <li>Add the following delegate method to your class: <pre><code>- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer { if([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]] && ! shouldAllowPan) { return NO; } return YES; } </code></pre></li> <li>Then add either a property or ivar which will track if the pan should be allowed to begin (see method above). In my case <code>BOOL shouldAllowPan</code>.</li> <li>Set the BOOL to <code>NO</code> in your <code>init</code> or <code>viewDidLoad</code>. Inside your longPress handler set the BOOL to <code>YES</code>. I do it like this: <pre><code>- (void) longPressHandler: (UILongPressGestureRecognizer *) gesture { if(UIGestureRecognizerStateBegan == gesture.state) { shouldAllowPan = NO; } if(UIGestureRecognizerStateChanged == gesture.state) { shouldAllowPan = YES; } } </code></pre></li> <li>Inside the panHandler I do a check on the BOOL: <pre><code>- (void)panHandler:(UIPanGestureRecognizer *)sender{ if(shouldAllowPan) { // do your stuff } </code></pre></li> <li>And finally reset the BOOL within the panHandler: <pre><code>else if(sender.state == UIGestureRecognizerStateEnded || sender.state == UIGestureRecognizerStateFailed || sender.state == UIGestureRecognizerStateCancelled) { shouldAllowPan = NO; } </code></pre></li> <li>And then go grab a beer to congratulate yourself. ;)</li> </ol>
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1. POCombining a UILongPressGestureRecognizer with a UIPanGestureRecognizer
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1. USAndy B
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