Passing selected row data to next View Controller Swift 3

Question

I am new to Swift Programming and I am having problems. So what I want to do is when the user selects the row in a table then I want to grab the selected row's title and then pass it to the next View Controller. Here is my code for the First View Controller:

let senderArray = ["Sogyal","Ram"]
let messageArray = ["Hello","What's up?"]

cell.senderName.text = senderArray[indexPath.row]
cell.senderMessage.text = messageArray[indexPath.row]

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    newIndex = indexPath.row

    let selectedMessage = messageArray[indexPath.row]

    let composeVC = ComposeMessageVC()
    composeVC.usernameLbl = selectedMessage

    tableView.deselectRow(at: indexPath, animated: true)
    performSegue(withIdentifier: "goToComposeM", sender: self)
}

Any help would be appreciated.

Sweeper · Accepted Answer · 2018-01-26T18:10:59.520

1

You need to pass the data in prepare(for segue: UIStoryboardSegue, sender: Any?) if you are using a segue. So change your didSelectRowAt to this:

newIndex = indexPath.row

let selectedMessage = messageArray[indexPath.row]

tableView.deselectRow(at: indexPath, animated: true)
performSegue(withIdentifier: "goToComposeM", sender: selectedMessage)

Then override prepareForSegue:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let vc = segue.destination as? ComposeMessageVC {
        vc.usernameLbl = sender as! String
    }
}

Your approach did not work because you are creating a new VC yourself, which is a different one from the one that is actually presented.

edited Jan 26 '18 at 18:10

answered Jan 26 '18 at 17:43

Sweeper

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where should i use the override func? – Sogyal Thundup Sherpa Jan 26 '18 at 18:03
In your VC, alongside other funcs. @SogyalThundupSherpa – Sweeper Jan 26 '18 at 18:04
i am getting an error in the if let vc = sender.destination as? ComposeMessageVC { vc.usernameLbl = sender as! String } – Sogyal Thundup Sherpa Jan 26 '18 at 18:09
@SogyalThundupSherpa oops! It should have been `segue.destination`. – Sweeper Jan 26 '18 at 18:11
Will it be a UILabel ? not a string? as i am getting an error when it is a label Could not cast value of type '__NSCFString' (0x10c51e168) to 'UILabel' (0x10a434d68). – Sogyal Thundup Sherpa Jan 26 '18 at 18:20
@SogyalThundupSherpa Oh so `vc.usernameLbl` is a `UILabel`? Then you need to add another variable in ComposeMessageVC to receive the data. You then set the label's text to that variable in the VC's viewDidLoad. – Sweeper Jan 26 '18 at 18:21
i got an error Could not cast value of type '__NSCFString' (0x10c51e168) to 'UILabel' (0x10a434d68) – Sogyal Thundup Sherpa Jan 26 '18 at 18:22
@SogyalThundupSherpa If you think my answer answers your question, please consider accepting it by clicking on that checkmark! – Sweeper Jan 26 '18 at 18:24
@SogyalThundupSherpa this is not an on topic question for stack overflow, try searching on google. – Sweeper Jan 26 '18 at 18:29

score 0 · Answer 2 · answered Jan 26 '18 at 17:43

You can try something like this:

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    ...
    let destination = YourViewController()
    destination.usernameLbl = selectedMessage
    navigationController?.pushViewController(destination, animated: true)
    ...
}

Passing selected row data to next View Controller Swift 3

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