Question

Hi I have currently made a push on select to get my table view to push to a detail view. I also have this code to send the name of the table cell that was selected:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *acell = [tableView cellForRowAtIndexPath:indexPath];
    selectedCell = acell.textLabel.text;

    DetailViewController *myDetViewCont = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:[NSBundle mainBundle]];

    myDetViewCont.navigationItem.title = selectedCell;
    [self.navigationController pushViewController:myDetViewCont animated:YES];

}

It builds successfully but in the simulator It throws an error:

@autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
Thread: 1 signal: SIGABRT

I’ve looked up similar problems but havent found a solution.
Any Help?

Ok additional info on the error:

[self.navigationController pushViewController:myDetViewCont animated:YES];

Answer 1

If you’re using storyboards, then the following line doesn’t make sense:

DetailViewController *myDetViewCont = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:[NSBundle mainBundle]];

Do you have a NIB file called DetailViewController.xib in your project? Presumably not. Thus myDetViewCont will be nil and you’ll get an exception. If you do have that NIB, then what is the push segue going between (because you can’t segue from a storyboard to a NIB)?

Assuming that you really want to use storyboards, and not NIBs, if you already have a push segue between the controllers, give that segue an identifier (you do this in Interface Builder; in my code below I’ll just use youridentifier as a placeholder for whatever you specify, which you’ll replace with the correct identifier) and then you should transition using the segue:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *acell = [tableView cellForRowAtIndexPath:indexPath];
    [self performSegueWithIdentifier:@"youridentifier" sender:acell];
}

If you want to send data to the new controller, you’d use prepareForSegue to do that:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"youridentifier"])
    {
        if ([sender isKindOfClass:[UITableViewCell class]])
        {
            UITableViewCell *selectedCell = sender;
            UIViewController *myDetViewCont = segue.destinationViewController;
            myDetViewCont.navigationItem.title = selectedCell.textLabel.text;
        }
        else
        {
            NSLog("%s Was expecting sender to be a tableviewcell", __FUNCTION__);
        }
    }
}