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POiOS: Cancel UIScrollView touches when using 2 fingers
 

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    <p>I have written a UIScrollView subclass that I am using to scroll a series of UITableViews. See the following diagram:</p> <p><img src="https://i.stack.imgur.com/PEE4a.png" alt="enter image description here"></p> <p>As you can see I have several vertically scrolling UITableViews, that are being scrolled horizontally inside a parent UIScrollView. This all works fine. However the application has a number of <em>global</em> gestures. For example, if I swipe in a given direction with 2 fingers, I do a UIView transition to another part of the app. but if I do the gesture on top of the scroll view and/or its child table views, they naturally scroll their content. This doesn't look good and causes some layout issues.</p> <p>What I would like to figure out is how to disable all scrolling, on both the UIScrollView and its child UITableViews, when a user touches <em>anywhere</em> with two fingers, and only with two fingers. I've tried variations of overriding touchesBegan, touchesEnded, touchesShouldCancel etc... but I can't get it quite right. Any help is much appreciated.</p> <p>Here is my gesture handling code:</p> <pre><code>UISwipeGestureRecognizer *twoFingerSwipeUp = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleTwoFingerSwipe:)]; [twoFingerSwipeUp setNumberOfTouchesRequired:2]; [twoFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp]; [twoFingerSwipeUp setDelegate:self]; // 'self' is the superview of the UIScrollView, which is a UIView. [self addGestureRecognizer:twoFingerSwipeUp]; [twoFingerSwipeUp release]; // ... repeat the above code for up, down, left, right gestures ... - (void)handleTwoFingerSwipe:(UISwipeGestureRecognizer*)swipeGesture { switch ([swipeGesture direction]) { case UISwipeGestureRecognizerDirectionUp: [self changeToView:viewAbove]; break; case UISwipeGestureRecognizerDirectionDown: [self changeToView:viewBelow]; break; case UISwipeGestureRecognizerDirectionRight: [self changeToView:viewToTheRight]; break; case UISwipeGestureRecognizerDirectionLeft: [self changeToView:viewToTheLeft]; break; } } </code></pre>
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