Invoking push segue programmatically and prepareforsegue method

Question

I'm invoking push segue programmatically as below

    UIStoryboard *mainStoryBoard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *vc = [mainStoryBoard instantiateViewControllerWithIdentifier:@"addToCartViewContollerForItem"];
    [self.navigationController pushViewController: vc animated:YES];

but my problem is I want to send some info with this segue to the destination viewcontroller. But the method - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender is not getting fired at all.

this is how the prepareforsegue method

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
    NSLog(@"segue from deals screen");
    //addToCartViewContollerForItem
    if([[segue identifier] isEqualToString:@"addToCartSegue"]){
        NSIndexPath *selectedRow = [[self tableView] indexPathForSelectedRow];

        Item *currentItem = [[Item alloc]init];
        currentItem = [itemList objectAtIndex:[selectedRow row]];

        RESTAddToCartViewController *vc = [segue destinationViewController];
        [vc setCurrentItem:currentItem];
    }
}

What am I missing here?

On which action you want the segue to happen, like unbutton action or uitableview cell selection? — Suhit Patil, Dec 13 '13 at 05:23
uitableview cell selection. I did it using `didSelectRowAtIndexPath` — Jay Mayu, Dec 13 '13 at 05:23
You can directly use prepareForSegue method without didSelectRow method with the code you written or you can call perform segue from your didSelectRow method, check my answer. — Suhit Patil, Dec 13 '13 at 05:30
I think the main confusion is in the first line of the post. That navigation controller push does not perform a push segue. self performSegueWithIdentitifer is the way to do that, as @suhit suggests. — danh, Dec 13 '13 at 05:31
@dahn rightly said, UINavigationController pushViewController does not perform the push segue, best way is performSegueWithIdentitifer and prepareForSegue: method. — Suhit Patil, Dec 13 '13 at 05:37

Suhit Patil · Accepted Answer · 2017-01-05T09:51:01.577

Call performSegueWithIdentifier: from your didSelectRowAtIndexPath method

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [self performSegueWithIdentifier:@"addToCartSegue" sender:self];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
    NSLog(@"segue from deals screen");
    //addToCartViewContollerForItem
    if([[segue identifier] isEqualToString:@"addToCartSegue"]){
        NSIndexPath *selectedRow = [[self tableView] indexPathForSelectedRow];

        Item *currentItem = [[Item alloc]init];
        currentItem = [itemList objectAtIndex:[selectedRow row]];

        RESTAddToCartViewController *vc = [segue destinationViewController];
        [vc setCurrentItem:currentItem];
    }

}

in Swift 2.3

//MARK: didSelectRowAtIndexPath

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier("addToCartSegue", sender: self)
}


// MARK: - Navigation

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    if segue.identifier == "addToCartSegue" {
        let selectedIndexPath = self.tableView.indexPathForSelectedRow
        let currentItem: Item = itemList[selectedIndexPath.row]
        if let viewcontroller = segue.destinationViewController as? RESTAddToCartViewController {
            viewcontroller.currentItem = currentItem
        }
    }
}

Swift 3

//MARK: didSelectRowAtIndexPath

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    performSegue(withIdentifier: "addToCartSegue", sender: self)
}

// MARK: - Navigation

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "addToCartSegue" {
        if let selectedIndexPath = self.tableView.indexPathForSelectedRow {
            let currentItem: Item = itemList[selectedIndexPath.row]
            if let viewcontroller = segue.destination as? RESTAddToCartViewController {
                viewcontroller.currentItem = currentItem
            }
        }
    }
}

Thanks It worked Thos who face similar issue must read this answer too http://stackoverflow.com/a/17012857/2636704 — Jay Mayu, Dec 13 '13 at 05:36

score 0 · Answer 2 · answered Dec 13 '13 at 05:30

0

This is the information that you are looking for :

 (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showRecipeDetail"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        RecipeDetailViewController *destViewController = segue.destinationViewController;
        destViewController.recipeName = [recipes objectAtIndex:indexPath.row];
    }
}

prepareForSegue will get called along with [self perform segue] and this is the tutorial you should definitely look into.

answered Dec 13 '13 at 05:30

Matt

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1

It's a good answer if he were performing segue properly. But this code won't get called until he does performSegueWithIdentifier: – danh Dec 13 '13 at 05:32
I actually want him to check out the tutorial for the rest, because that's exactly what he is trying to do. – Matt Dec 13 '13 at 05:36

Invoking push segue programmatically and prepareforsegue method

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