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    <p>There will be overlap when scrollView.frame.origin.x + viewB.frame.size.width + scrollView.contentOffset.x >= viewA.frame.origin.x</p> <p><strong>After Edit:</strong></p> <p>I couldn't get the scroll view to work so I tried it another way that worked pretty well. Instead of a scroll view, I just used a rectangular view with a background color, and added the blue square to it. I gave the blue square a set width and height in IB, centered it in the long skinny view (in the y direction), and had one other constraint to the left side of that long view. The IBOutlet leftCon is connected to that constraint. I then used this code to drag it, and have it go back when I let go:</p> <pre><code>#import "ViewController.h" #import &lt;QuartzCore/QuartzCore.h&gt; @interface ViewController () @property (strong,nonatomic) UIPanGestureRecognizer *panner; @property (strong,nonatomic) IBOutlet NSLayoutConstraint *leftCon; @property (strong,nonatomic) CADisplayLink *displayLink; @end @implementation ViewController { IBOutlet UIView *blueSquare; } -(void)viewDidLoad { self.panner = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePanGesture:)]; [blueSquare addGestureRecognizer:self.panner]; } - (void)handlePanGesture:(UIPanGestureRecognizer *)sender { CGPoint translate = [sender translationInView:self.view]; if (self.leftCon.constant &lt;160) if (self.leftCon.constant &gt; 100) NSLog(@"Bang! We have a collision"); self.leftCon.constant = translate.x; if (sender.state == UIGestureRecognizerStateEnded){ [self startDisplayLink]; } } -(void)startDisplayLink { self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(bounceBack:)]; [self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; } - (void)stopDisplayLink { [self.displayLink invalidate]; self.displayLink = nil; } -(void)bounceBack:(CADisplayLink *) link { self.leftCon.constant -= 12; if (self.leftCon.constant &lt; 2) { [self stopDisplayLink]; self.leftCon.constant = 2; } } </code></pre> <p>The numbers in the translate code (160 and 100) were determined empirically by logging. The 160 number keeps it from going off the right edge of the long view, and the 100 number is where it starts to overlap the black box.</p>
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    1. POUIView in UIScrollview. frame.origin not changing on scrolling, can't detect collision
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    1. POUIView in UIScrollview. frame.origin not changing on scrolling, can't detect collision
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    1. COTried this in UIView B's touchesBegan, but its superview's contentOffset is always {0, 0} Also set the UIScrollView's delaysContentTouches to NO, but it didn't change anything.
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    2. CO@Jay, so when you scroll, the content offset doesn't change?
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    3. COthat's what it looks like. It's bizarre. touchesMoved gets called correctly as I scroll but the contentOffset in the log output never changes. EDIT: this seems to be an issue with the UIScrollView's contentSize. I increased it and ran a test; the contentOffset is updating now. Will work a bit more with it and figure out what's wrong. Thanks for the help!
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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