Question

I need two UITableViews in the same NIB. I have used IB and created a view with the two tables.

My header file contains the ViewController and two classes, one for each of the tables (see below). In IB I can connect each table’s delegate and datasource to FileOwner, but I cannot work out how to create the IBOutlet connection. I’m getting this message: -[News tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x15d3c0
2011-12-11 07:20:27.480 myCity1[659:707] Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[News tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x15d3c0’

Here’s the header file:

@interface News : UIViewController {

}

@end

@interface TownNews : UITableViewController {

UITableView *townNewsTable;

}

@property (nonatomic, retain) IBOutlet UITableView *townNewsTable;

@end

@interface GeneralNews : UITableViewController {

UITableView *generalNewsTable;

}

@property (nonatomic, retain) IBOutlet UITableView *generalNewsTable;

@end

Answer 1

I was dealing with this thing in one of my projects (you can watch it: free app with name IJCAI11 in the appstore; the tab ‘People’ (there the indexing is done with a separate tableView)); and as far as I see by the code above, you’re making things to be too complicated. I’ll describe how I did it instead of saying what you shouldn’t do 🙂

I had only one class, let’s say YaddaYaddaViewController.

@interface YaddaYaddaViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
    UITableView *tableView1;
    UITableView *tableView2;
}
@property (nonatomic, retain) IBOutlet UITableView * tableView1;
@property (nonatomic, retain) IBOutlet UITableView * tableView2;

@end

Note that the viewController is derived from UIViewController, not UITableViewController (the goal of class UITableViewController is to be able to implement simple tableView in 2 minutes, for more custom stuff you should always use UIViewController. To read more about that, take a glance at the documentation of UITableViewController class).

In the IB for “File’s Owner” I simply set YaddaYaddaViewController;
I link the tableView1 and tableView2 outlets to the proper tables in the View;
I link the delegate and the datasource to the both tableView1/2, so I have ‘multiple’ delegate and datasource.

And finally, in the code, for all delegate methods (e.g. tableView:cellForRowAtIndexPath:)
I just pay attention to the tableView value, a delegate-event of which caused the calling of this method, like:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.tableView1) {
        // some code here
    } else {
        // alternative code here
    }
}

Hope this helps!