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PO
 

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    <p>What worked for me and what I believe to be the correct answer is to use UIViewController method found in <a href="http://developer.apple.com/library/ios/#documentation/uikit/reference/UIViewController_Class/Reference/Reference.html" rel="noreferrer">Apple Developer Guide</a>:</p> <p><em>shouldPerformSegueWithIdentifier:sender:</em></p> <p>I implemented my method like so:</p> <pre><code>- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender { if ([identifier isEqualToString:@"Identifier Of Segue Under Scrutiny"]) { // perform your computation to determine whether segue should occur BOOL segueShouldOccur = YES|NO; // you determine this if (!segueShouldOccur) { UIAlertView *notPermitted = [[UIAlertView alloc] initWithTitle:@"Alert" message:@"Segue not permitted (better message here)" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; // shows alert to user [notPermitted show]; // prevent segue from occurring return NO; } } // by default perform the segue transition return YES; } </code></pre> <p>Worked like a charm!</p> <hr> <p><strong>Updated with Swift for >= iOS 8</strong>:</p> <pre><code>override func shouldPerformSegueWithIdentifier(identifier: String!, sender: AnyObject!) -&gt; Bool { if identifier == "Identifier Of Segue Under Scrutiny" { // perform your computation to determine whether segue should occur let segueShouldOccur = true || false // you determine this if !segueShouldOccur { let notPermitted = UIAlertView(title: "Alert", message: "Segue not permitted (better message here)", delegate: nil, cancelButtonTitle: "OK") // shows alert to user notPermitted.show() // prevent segue from occurring return false } } // by default perform the segue transitio return true } </code></pre>
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    1. POTo stop segue and show alert
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    1. COdoes the usage of performSegueIfValid() have any downside?
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    2. COI believe it's a user-defined method (did not find it in docs) ...so I didn't try it. But the way I see it, from a design perspective it's not ideal to to be using storyboard segues, but redirecting the connections from their typical outlets to accommodate a feature.
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    3. COshouldPerformSegueWithIdentifier:sender: is available since iOS 6, and will not be called from iOS 5.
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Guidance
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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