Question

I’m trying to learn table views and I’ve hit a snag. I have the view delegate and datasource connected correctly in Storyboard, but I get the following runtime error when I get to the section of my app containing the table view.

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UINavigationItem tableView:numberOfRowsInSection:]: unrecognized selector sent to instance

Here’s the chunk from my implementation file

@implementation CraftingViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 5;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; 
    }

    cell.textLabel.text = @"Detail";

    return cell;

}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

}

Answer 1

That error message is displaying because tableView:numberOfRowsInSection: is being sent to an object of type UINavigationItem while it seems like your CraftingViewController class is probably of type UITableViewController. I would make sure that you have connected your delegate to the correct class, because it doesn’t seem like CraftingViewController is connected properly.