UITableView not displaying when embedded in another view - ios

Question

I am trying to create a view with three big subviews side-by-side. The three subviews should all be UITableViews packaged in UINAvigationControllers. I am using a subclass for UITableViewController named "TOGViewController" here.
When I do set this up, the UITableViews are not updating. The header (from the UINAvigationController) appears, but the space below stays white. When I debug it, I can see that cellForRowAtIndexPath is NEVER called. numberOfSectionsInTableView, numberOfRowsInSection and even heightForRowAtIndexPath are all called. But cellForRowAtIndexPath never!
CODE (only for the first, leftmost subview)
// Create a big scrollview 3 times as wide as the screen and paginate it
CGRect screenRect = self.view.bounds;
CGRect wholeViewRect =screenRect;
wholeViewRect.size.height= screenRect.size.height;
wholeViewRect.size.width= screenRect.size.width * 3.0;
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame: wholeViewRect];
scrollView.contentSize = wholeViewRect.size;
scrollView.contentOffset = CGPointMake(screenRect.size.width, 0);
scrollView.pagingEnabled = TRUE;
self.view = scrollView;
// Add a view to the left
CGRect firstRect = screenRect;
firstRect.size.width -= 1;
TOGViewController *insightsViewController = [[TOGViewController alloc] init];
insightsViewController.view.frame = firstRect;
[self addChildViewController:insightsViewController];
[scrollView addSubview: insightsViewController.view];
When I am using exactly the same TOGViewController (subclass of UITableViewController) and place this directly on the screen it works fine. But as soon as I embed this into a scrollview with two other UITableViews, none of the table views displays anything.
EDIT: I pasted the wrong code in the question from an older version. There are no UINavigationController around each UITableViewController. There is only one UINavigationController for the whole triple view consisting of 3 table views.

Answer 1

If you want multiple UITableViews in one view, each with their own Navigation Controller, you'll want to put each TableView in its own Container View.
Check Apple's documentation and various tutorials available online.
There are various other questions that deal with this topic. The key is to make each UITableView a property of your View:
#property (nonatomic, strong) IBOutlet UITableView* firstTableView;
#property (nonatomic, strong) IBOutlet UITableView* secondTableView;
#property (nonatomic, strong) IBOutlet UITableView* thirdTableView;
You would only keep one delegate and datasource for all of them. Then in your UITableView delegate and datasource methods you would include if statements to check which UITableView you are in.
For example:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
...
if (tableView == self.firstTableView) {
...
} else if (tableView == self.secondTableView) {
...
} else {
//thirdTableView code
}
}

Answer 2

It sounds like something is messed up with UITableViewDataSource Protocol delegate property on your TableViews. tableView:cellForRowAtIndexPath: is called on the tableView.datasource object. Although I am kinda confused as how tableView:numberOfRowsInSection: is getting called but NOT tableView:cellForRowAtIndexPath:.