Dismiss my view controller but "prepare" the view controller underneath

Question

I have a modally-presented ViewController that has a UITableView inside it. When the user clicks "Days", it shows this view controller (modally). Here's my Storyboard:

What I want to do is, when I click one of the cells in the table view in the modal, I want to dismiss the modal, but also load new data in the root view controller.

How can I have access to the root view controller from a segued view controller?

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.dismiss(animated: true, completion: nil)
}

// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let destinationVC = segue.destination as! DayView
    if let indexPath = tableView.indexPathForSelectedRow {
        destinationVC.day = days![indexPath.row]
    }
}

I want something like what I've written above, but while my modal does get dismissed, but what I want is for somehow the code in the prepare function to fire when a TableViewCell is clicked.

score 1 · Answer 1 · answered Jan 28 '21 at 07:16

A shorter and simpler method than protocol/delegate is to create a closure:

For sending a String back, In First ViewController:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let viewControllerB = segue.destination as? ViewControllerB {
        viewControllerB.callback = { message in
            
            //Do what you want in here!

        }
    }
}

In ViewControllerB:


var callback : ((String) -> Void)?

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    callback?("Your Data")
    self.dismiss(animated: true, completion: nil)
}

score 0 · Accepted Answer · answered Jan 28 '21 at 07:19

you are in the right path,you need to add two more functions 1. unwindsegue and one this is not destination its source so you need change to source from destination.

 // MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let destinationVC = segue.source as! DayView
    if let indexPath = tableView.indexPathForSelectedRow {
        destinationVC.day = days![indexPath.row]
    }
}

for Reference : How to Pass Data in an Unwind Segue

Dismiss my view controller but "prepare" the view controller underneath

2 Answers2