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POAnimating objects from off screen loss of response
 

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    <p>I have a <code>UIViewController</code>. Within that is a <code>UITableView</code> which is drawn at origin <code>0,0</code>. I also have a <code>UIScrollView</code> that is drawn at <code>0,-80</code> so that it is off screen and not visible. </p> <p>When a menu button is pressed, I animate the <code>UIViewController</code>'s frame down 80px to reveal the <code>UIScrollView</code>. </p> <p>The problem here is that the <code>UIScrollView</code> does not respond at all. </p> <p>If I draw the <code>UIScrollView</code> at say <code>0,0</code>, where it IS visible on load, it works fine. I can even animate it off screen then back on screen with no issue. </p> <hr> <p>Here is how my view looks <em>before</em> animating:</p> <pre><code> _____________________________ | | Frame -&gt; (0,-80, 320, 80) | ScrollView | **Offscreen** |_____________________________| | | &lt;- Original view (0,0,320,480) | | | | | | | | | | | Original View | | | | | | | | | | | | | | | | | | | | | |_____________________________| </code></pre> <hr> <p>When I animate I do the following:</p> <pre><code>[UIView animateWithDuration:0.3 delay:0.0 options:(UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseIn) animations:^{ self.view.frame = CGRectMake(0.0, (self.view.frame.origin.y + container.frame.size.height), self.view.frame.size.width, self.view.frame.size.height); scroll.userInteractionEnabled = YES; } completion:^(BOOL finished) { if (scrollLoaded == NO) { [self loadFavorites]; scrollLoaded = YES; } }]; </code></pre> <hr> <p>Now my view looks like this <em>after</em> animating:</p> <pre><code> _____________________________ | | Frame -&gt; (0, -80, 320, 80) | ScrollView | |_____________________________| | | &lt;- Original view (0, 80, 320, 480) | | | | | | | | | | | Original View | | | | | | | | | | | | | | | |_____________________________| | | | **Offscreen** | |_____________________________| </code></pre> <hr> <p>I have subclassed my <code>scrollView</code> to listen more closely for events:</p> <p><strong>.h</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @interface UIScrollView_ExtraTouch : UIScrollView @end </code></pre> <p><strong>.m</strong></p> <pre><code>#import "UIScrollView+ExtraTouch.h" @implementation UIScrollView_ExtraTouch - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"scrollview touchesBegan"); [self.nextResponder touchesBegan:touches withEvent:event]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"scrollview touchesMoved"); if(!self.dragging){ [self.nextResponder touchesMoved:touches withEvent:event]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"scrollview touchesEnded"); [self.nextResponder touchesEnded:touches withEvent:event]; } @end </code></pre> <hr> <p>Nothing goes to the log after the animation. Which I <em>think</em> means that since the frame is at <code>-80</code>, it believes it to be off screen, thus not receive any type of action. </p> <p>Is this correct? If so is there a way to fix it?</p>
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