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POTab Bar and Nav Controller: Where did I go wrong in my Interface Builder wiring?
 

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  1. POTab Bar and Nav Controller: Where did I go wrong in my Interface Builder wiring?
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    <p>I've been working on an iPhone application in XCode and Interface Builder of the Tab Bar project type. After getting a table view of topics (business sectors) working fine I realized that I would need to add a Navigation Control to allow the user to drill into a subtopics (subsectors) table.</p> <p>As a green Objective-C developer, that was confusing, but I managed to get it working by reading various documentation trying out a few different IB options. My current setup is a Tab Bar Controller with Tab 1 as a Navigation Controller and Tab 2 a plain view with a Table View placed into it. The wiring works: I can log when table rows are selected and I'm ready to push a new View Controller onto the stack so that I can display the subtopics Table View. </p> <p>My problem: For some reason the first tab's Table View is a delegate and dataSource of the second tab. It doesn't make sense to me and I can't figure out why that's the only setup that works. I am having other problems that I believe are caused by the goofy wiring.</p> <p><a href="http://i43.tinypic.com/30nap85.jpg" rel="nofollow noreferrer">alt text http://i43.tinypic.com/30nap85.jpg</a></p> <p>Here is the wiring:</p> <ul> <li>Navigation Controller (Sectors) is a delegate of Tab Bar <ul> <li>Navigation Bar is a delegate of Navigation Controller (Sectors)</li> <li>View Contoller (Sectors) has a view of Table View </li> <li>Table View (in Navigation Controller (Sectors)) is a delegate of First View Controller (Companies)</li> <li>Table View (in Navigation Controller (Sectors)) is a dataSource outlet of First View Controller (Companies)</li> </ul></li> <li>First View Controller (Companies) <ul> <li>First View Contoller (Sectors) has a view of Table View </li> <li>Table View (in First View Controller (Companies)) is not hooked up to a dataSource outlet and is not a delegate</li> </ul></li> </ul> <p>When I click the tab buttons and look at the Inspector I see that the first tab is correctly hooked up to my MainWindow.xib and the second tab has selected a nib called SecondView.xib. It's in the File's Owner of MainWindow.xib where I inherit UITableViewDataSource and UITableViewDelegate (and also UITabBarControllerDelegate) in the .h, and in the .m where I implement the delegate methods. </p> <p>Why does this setup only work when the Table View in my first tab (View Controller (Sectors)) is a delegate and dataSource of the second tab? I'm confused: why wouldn't it need to be hooked up to the Navigation Controller-enabled tab in which the Table View is seen (Navigation Controller (Sectors))? The Table View seen on the second tab has neither dataSource and is not a delegate.</p> <p><a href="http://i40.tinypic.com/15ri1ig.jpg" rel="nofollow noreferrer">alt text http://i40.tinypic.com/15ri1ig.jpg</a> <a href="http://i44.tinypic.com/2dwete9.jpg" rel="nofollow noreferrer">alt text http://i44.tinypic.com/2dwete9.jpg</a></p> <p>I'm having trouble getting a pushViewController to fire (self.navigationController is not nil but the new View Controller still doesn't load) and I suspect that I need to work out this IB wiring issue before I can troubleshoot why the Nav Controller won't push a new View Controller onto the stack. </p> <pre><code>if(nil == self.navigationController) { NSLog(@"self.navigationController is nil."); } else { NSLog(@"self.navigationController is not nil."); SectorList *subsectorViewController = [[SectorList alloc] initWithNibName:@"SectorList" bundle:nil]; subsectorViewController.title = @"Subsectors"; [[self navigationController] pushViewController:subsectorViewController animated:YES]; [subsectorViewController release]; } </code></pre>
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