Perform Segue programmatically and pass parameters to the destination view

Question

in my app I've a button that performs a segue programmatically:

- (void)myButtonMethod
{
    //execute segue programmatically
    [self performSegueWithIdentifier: @"MySegue" sender: self];
}

I would like to know if there is a way to reference the destination view and to pass it some parameters.

I know that in prepareForSegue method, I can refer to it with:myDestinationViewController *vc = [segue destinationViewController];, but I don't know how to this executing the segue programmatically.

Do you have any ideas?

Thanks, yassa

---

UPDATE:

I'm sorry for this question!!! I simply discovered that, even if the segue is invoked programmatically, the prepareForSegue method is called anyway and so it is possible to pass parameters in the same usual way.

Solution 1

The answer is simply that it makes no difference how the segue is triggered.

The prepareForSegue:sender: method is called in any case and this is where you pass your parameters across.

Solution 2

Old question but here's the code on how to do what you are asking. In this case I am passing data from a selected cell in a table view to another view controller.

in the .h file of the trget view:

@property(weak, nonatomic)  NSObject* dataModel;

in the .m file:

@synthesize dataModel;

dataModel can be string, int, or like in this case it's a model that contains many items

- (void)someMethod {
     [self performSegueWithIdentifier:@"loginMainSegue" sender:self];
 }

OR...

- (void)someMethod {
    UIViewController *myController = [self.storyboard instantiateViewControllerWithIdentifier:@"HomeController"];
    [self.navigationController pushViewController: myController animated:YES];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if([segue.identifier isEqualToString:@"storyDetailsSegway"]) {
        UITableViewCell *cell = (UITableViewCell *) sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
        NSDictionary *storiesDict =[topStories objectAtIndex:[indexPath row]];
        StoryModel *storyModel = [[StoryModel alloc] init];
        storyModel = storiesDict;
        StoryDetails *controller = (StoryDetails *)segue.destinationViewController;
        controller.dataModel= storyModel;
    }
}

Solution 3

Swift 4:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "ExampleSegueIdentifier" {
        if let destinationVC = segue.destination as? ExampleSegueVC {
            destinationVC.exampleString = "Example"
        }
    }
}

Swift 3:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "ExampleSegueIdentifier" {
            if let destinationVC = segue.destinationViewController as? ExampleSegueVC {
                destinationVC.exampleString = "Example"
            }
        }
    }

Comments

[danielbeard]

Add the update as an answer and accept it so that people know this has been answered :)

[DanSkeel]

Add answer, comment for notification.

[lindon fox]

You should mark the answer below as correct, so people know that it has been answered.

[NeverwinterMoon]

This still bothers me - this means I have to trigger segue in one place, where I have the data that I want to send as parameters nicely isolated from anything else, but to add that data in a completely different place - the prepareForSegue, where we don't know anything about the data needed to be passed. Meaning, I have to create a state with that data in question in the context shared by two different functions (one triggering segue, the other - preparing). I don't want to dirty the state when all I need is to open a new view with some data...

[trapper]

Use sender to pass context needed to configure the destination VC

[NeverwinterMoon]

I assumed that passing payload in sender is an anti-pattern. It should just contain the info about who triggered the segue, not the data that the thing that triggered the segue intended to pass further.

[NeverwinterMoon]

From the official docs on sender: "This object is made available for informational purposes during the actual segue."

[trapper]

Yeah don’t pass an actual payload, pass context, like which cell/button/index/etc triggered the segue.