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POUIScrollView touches vs subview touches
 

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    <p>Please can someone help sort a noob out? I've posted this problem on various forums and received no answers, while many searches for other answers have turned up stackOverflow, so I'm hoping this is the place. </p> <p>I've got a BeachView.h (subclass of UIScrollView, picture of a sandy beach) covered with a random number of Stone.h (subclass of UIImageView, a random PNG of a stone, userInteractionEnabled = YES to accept touches).</p> <p>If the user touches and moves on the beach, it should scroll. If the user taps a stone, it should call method "touchedStone". If the user taps the beach where there is no stone, it should call method "touchedBeach".</p> <p>Now, I realize this sounds dead simple. Everyone and everything tells me that if there's something on a UIScrollView that accepts touches that it should pass control on to it. So when I touch and drag, it should scroll; but if I tap, and it's on a stone, it should ignore beach taps and accept stone taps, yes?</p> <p>However, it seems that both views are accepting the tap and calling both touchedStone AND touchedBeach. Furthermore, the beach tap occurs first, so I can't even put in a "if touchedStone then don't run touchedBeach" type flag.</p> <p>Here's some code. On BeachView.m</p> <pre><code> - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { if (self.decelerating) { didScroll = YES; } else { didScroll = NO; } UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation = [touch locationInView:touch.view]; NSLog(@"touched beach = %@", [touch view]); lastTouch = touchLocation; [super touchesBegan:touches withEvent:event]; } -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { didScroll = YES; [super touchesMoved:touches withEvent:event]; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { if (didScroll == NO && isPaused == NO) { [self touchedBeach:YES location:lastTouch]; } [super touchesEnded:touches withEvent:event]; } </code></pre> <p>On Stone.m</p> <pre><code> -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [parent stoneWasTouched]; // parent = ivar pointing from stone to beachview } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [[event allTouches] anyObject]; CGPoint touchLocation = [touch locationInView:touch.view]; NSLog(@"touched stone = %@", [touch view]); [parent touchedStone:YES location:touchLocation]; } </code></pre> <p>After a stone tap, My NSLog looks like this:</p> <pre><code> Touched beach = &lt;BeachView: 0x1276a0&gt; ran touchedBeach Touched Stone = &lt;Stone: 0x1480c0&gt; ran touchedStone </code></pre> <p>So it's actually running both. What's even stranger is if I take the touchesBegan and touchesEnded out of Stone.m but leave userInteractionEnabled = YES, the beachView registers both touches itself, but returns the Stone as the view it touched (the second time).</p> <pre><code> Touched beach = &lt;BeachView: 0x1276a0&gt; ran touchedBeach Touched beach = &lt;Stone: 0x1480c0&gt; ran touchedBeach </code></pre> <p>So PLEASE, I've been trying to sort this for days. How do I make it so a tapped stone calls only touchedStone and a tapped beach calls only touchedBeach? Where am I going wrong?</p>
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