Using nested function

Question

I am trying to use a nested function in xcode. What am I doing wrong?

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

        func prepare(for segue: UIStoryboardSegue, sender: Any?){
            print("Worked")
        }

    }

I am expecting my code to print "Worked" when the segue happens. It is not printing.

Because I want to get the "indexPath.row" from the didSelectRowAt and use it in the prepare function. — Ya3goobs
– Ya3goobs, Commented Sep 6, 2019 at 22:38

rmaddy · Accepted Answer · 2019-09-06 22:41:36Z

1

The prepare method is a method of UIViewController. You need to properly override it. This means it can't be a nested function. It needs to be top-level method of your view controller.

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

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    print("Worked")
}

If you need access to indexPath in prepare, you need to pass it, not self, as the sender parameter.

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

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    print("Worked")
    if let indexPath = sender as? IndexPath {
        // do stuff with indexPath
    }
}

edited Sep 6, 2019 at 22:41

answered Sep 6, 2019 at 22:35

rmaddy

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2 Comments

Ya3goobs Over a year ago

The problem is I need to get the array data from the tableview and use it in the prepare function. How would I do that without nesting them, because I cant create a variable in the didSelectRowAt function and use it in the prepare function.

rmaddy Over a year ago

Your array is a property of the class, right? Access it like you are probably doing in several of your other existing methods of your class. If you need the indexPath, pass that as the sender, not self.

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