CODEWITHSUNDEEP
iosobjective-cxcodeios6uistoryboardsegue
user2825086
user2825086

Reputation:

Segue not passing data to destination

I have two table view controllers, one containing all the US states, the other presenting a list of data for the selected state. I have set up a segue in my main storyboard from the view controller (not the cell), and given it an identifier. For reasons beyond the scope of this post, I need to programmatically perform the segue without using the prepareForSegue method.

The source table view controller (AllStatesTableViewController) needs to execute the segue in the didSelectRowAtIndexPath method of the tableview. 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    stateID = [statesDict objectForKey:cell.textLabel.text];

    DetailTableViewController *destination = [[DetailTableViewController alloc] init];

    stateGauges = [[GaugeList alloc] initWithStateIdentifier:stateID andType:nil];
    // at this point stateGauges is NOT nil

    [destination setStateGauges:stateGauges];

    [self performSegueWithIdentifier:@"sgShowStateDetail" sender:self];
}

The segue performs as intended in that it navigates to its destination, but stateGauges is nil in the destination table view controller. It is not nil in the source table view controller. stateGuages is declared as a property in DetailTableViewController. Obviously I am doing something wrong. Any suggestions?

Thanks! V

Upvotes: 0

Views: 1060

Answers (2)

Wyatt Page
Wyatt Page

Reputation: 309

I ran into this before too. I found that when I let the storyboard handle the segue, it instantiates a new view controller. This is why stateGauges is nil, because you set stateGauges in your programmatically created view controller, not the one the storyboard created. If you won't use prepareForSeque, remove the segue from your AllStatesViewController to your DetailTableViewController in your storyboard. Then programmatically instantiate the storyboard, the view controller, setGauges, then present your view controller. Also, make sure you put "ShowStateDetail" in the "Storyboard ID" field, in the Identity section, on that DetailTableViewController in your storyboard.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
    stateID = [statesDict objectForKey:cell.textLabel.text];

    DetailTableViewController *destination = [[UIStoryboard storyboardWithName:@"yourStoryBoardName" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"ShowStateDetail"];

    stateGauges = [[GaugeList alloc] initWithStateIdentifier:stateID andType:nil];

    [destination setStateGauges:stateGauges];

    [self presentViewController:destination animated:YES completion:nil];
}

Upvotes: 1

Jordan Montel
Jordan Montel

Reputation: 8247

On your storyboard you need to choose to push your segue from your cell.

enter image description here enter image description here

and use your prepareForSegue to pass data :

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
    if ([segue.identifier isEqualToString:@"showDetail"]) 
    {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        DetailTableViewController *detailTableViewController = segue.destinationViewController;

        // Pass data here
        destViewController.stateGauges = stateGauges;
    }
}

Have a look here for more information

Upvotes: 4

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