How to pass selected row string in table view to another ViewController page? (Swift 2)

Question

I am running Xcode 7.3 and using Swift 2.2. I am having trouble passing data from my first view controller to the second view controller. I've created a variable string in my first view controller that holds the selected row in the tableview and it works. I have also created another variable string in my second view controller that should hold the name of the selected row, then pass the text to a label.

import UIKit
import Parse
import ParseUI

class FruitListPage: UIViewController, UITableViewDelegate, UITableViewDataSource {


var selectedFruit = String()

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let fruitName:Scanner2 = self.storyboard?.instantiateViewControllerWithIdentifier("scanPage") as! Scanner2
    fruitName.loadView()
    let nameShop = textArray[indexPath.row]
    print(nameShop)
    selectedFruit = nameShop

    print(selectedFruit)

    fruitName.selectedFruit2 = selectedFruit

}

Everything works completely fine unit here in the first view controller and I can see the fruit name every time I press a row in the tableview. The real problem is that selectedFruit2 string in the second view controller never grabs the data from the first view controller. Any clue?

import UIKit
import Parse

class Scanner2: UIViewController {

@IBOutlet var fruitNameLabel: UILabel!

var selectedFruit2 = String()

override func viewDidLoad() {
    super.viewDidLoad()

    print(selectedFruit2)

}

}

loadView documentation: "You should never call this method directly". Also note that you are setting selectedFruit2 after you have loaded the view. Removing the loadView will probably fix your problem although viewWillAppear(_:) will be probably safer than viewDidLoad — Sulthan
– Sulthan, Commented Mar 27, 2016 at 21:42

fellowProgrammer · Accepted Answer · 2016-11-22 13:20:23Z

1

You could try making a global variable and in the override func prepareForSegue method, initialize it with tableView.indexPathForSelectedRow!.row. This is how I did it and it worked fine.

answered Nov 22, 2016 at 13:20

fellowProgrammer

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Comments

Marco M · Accepted Answer · 2016-03-27 22:47:09Z

0

Connect your viewController in storyBoard with a segue and set its identifier as "scanPageSegue" for instance... then:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    performSegueWithIdentifier("scanPageSegue", sender: textArray[indexPath.row])
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "scanPageSegue" {
        if let fruitName = segue.destinationViewController as? Scanner2, 
           selectedFruit = sender as? String {
            fruitName.selectedFruit2 = selectedFruit
        }
    }
}

answered Mar 27, 2016 at 22:47

Marco M

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2 Comments

bbkrz Over a year ago

Thanks it was very helpful and easy... I tried the prepareforsegue function before but the real important part for me was to connect storyboard with segue and to do performseguewithidentifier, then do prepareforsegue. I was stuck on this for nearly 3 days now. Is this something new in swift 2?

Marco M Over a year ago

Not really, this is the basilar mechanism to use in storyBoard, it was the same also before swift :D Anyway... now you know it. Basically you never need to instantiate programmatically a VC with storyboard, use segue instead, you can also use a custom subclass for segue with your custom transitions.

José Roberto Abreu · Accepted Answer · 2016-03-27 22:19:54Z

0

Try with this, in your tableView:didSelectedRowAtIndexPath:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let fruitName:Scanner2 = self.storyboard?.instantiateViewControllerWithIdentifier("scanPage") as! Scanner2
    selectedFruit = textArray[indexPath.row]
    fruitName.selectedFruit2 = selectedFruit
    self.presentViewController(fruitName,animated:true,completion:nil)
}

answered Mar 27, 2016 at 22:19

José Roberto Abreu

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Comments

Cing · Accepted Answer · 2016-03-27 22:28:56Z

0

You could try this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if let indexPath = self.tableView.indexPathForSelectedRow {
let destinationVC = segue.destinationController
destinationVC.string = textArray[indexPath] //this is the string in second view controller
}
}

answered Mar 27, 2016 at 22:28

Cing

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