Question

I have a table view, and if a certain row is tapped, the detail view will show up. But how does the detail view know which row was tapped ?
So for instance, I have a MainController which displays names. If I tap “Johnny” The next screen should show a label with the string “Johnny”. How would I do that ?

[EDIT – Added code]

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    ArticleView *article = [self.storyboard instantiateViewControllerWithIdentifier:@"ArticleView"];
    [article.myLabel setText:@"random"];
    [self.navigationController pushViewController:article animated:YES];
}

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

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

    NSDictionary *info = [json objectAtIndex:indexPath.row];
    cell.textLabel.text = [info objectForKey:@"username"];
    cell.textLabel.backgroundColor = nil;
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.detailTextLabel.backgroundColor = nil;
    cell.detailTextLabel.textColor = [UIColor whiteColor];
    cell.detailTextLabel.text = [info objectForKey:@"user_pic"];

    // Configure the cell...

    return cell;
}

ArticleView.h

@interface ArticleView : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *myLabel;       
@end

ArticleView.m

-> Synthesizing properties

Answer 1

You could pass a object (i.e. the String Jonny) to the detail view controller as a property.

@interface ArticleViewController : UIViewController
@property (retain) ArticleView *articleView;
@end

//Don't forget to synthesize name 

in the tableview controller

-(void)tableView:(UITableView *)tableview didSelectRowAtIndexPath:(NSIndexPath)indexPath
{
    NSDictionary *info = [json objectAtIndex:indexPath.row];
    ArticleViewController *articleViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"ArticleViewController"]; 
    articleViewController.articleView = articleView;
    [self.navigationController pushViewController: articleViewController animated:YES];
}