CODEWITHSUNDEEP
iosswiftvariablesviewcontroller
Olli D.
Olli D.

Reputation: 59

Swift xCode 6.4 - using a variable generated by a tableview controller in a second view controller

I am am googling around the whole day for a probably simple question but I do not get it right. Hopefully someone can help me.

I have a tableview controller with one prototype cell containing three custom labels. When I run the app the table view controller will generate about 150 tableview cells with content parsed form a csv-file.

When I click on one of these cells the user will be forwarded two a second view controller showing some additional infotext for his cell selection. During the same time the user is clicking the tabelview cell a variable will be updated to the corresponding tableview-row-number (e.g. 150 for the last tableview cell. Now I want to use this variable as reference text within the text shown in the second view controller.

The variable in the tableview controller is "rowSelectedFromList" and will be set by the following code:

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    var rowSelectedFromList: String

    rowSelectedFromList = rowOfItems[indexPath.row].customlabel3!
    println(rowSelectedFromList)
}

The "println" is just for checking if it works correctly and it does.

The question is how can I use the variable "rowSelectedFromList" in the second view controller?

Appreciate your help, thanks!

Upvotes: 3

Views: 249

Answers (4)

Olli D.
Olli D.

Reputation: 59

The code which is working for me is a mixture Phoen1xUK and glyuck answers. I put both together and ended up with this working version:

For the FirstViewController:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "SecondControllerSegue" {
        if let indexPath = self.tableView.indexPathForSelectedRow() {
          let rowSelectedFromList = rowOfItems[indexPath.row].customlabel3
          (segue.destinationViewController as! SecondViewController).rowTransferedFromList = rowSelectedFromList
        }
    }
}

In the SecondViewController I set up the variable as follows:

var rowTransferedFromList: String!

Upvotes: 0

Lokesh Dudhat
Lokesh Dudhat

Reputation: 449

Good question if you want sort this problem plz follow below code:

class ViewController {
     var cvDataArray = cells = NSMutableArray.new()
    func viewDidLoad() {
        super.viewDidLoad()

        cvDataArray.enumerateObjectsUsingBlock({(obj: AnyObject, idx: Int, stop: Bool) in            var cell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier("")
            cell.textLabel.text = obj["title"]
            cells.addObject(cell)

        })
        tableView.reloadData()
    }

    func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return cells.count
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        return cells.objectAtIndex(indexPath.row)
    }

    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        var cell: UITableViewCell = cells.objectAtIndex(indexPath.row)
    }
}

Upvotes: 0

Matt Le Fleur
Matt Le Fleur

Reputation: 2856

You'll want to put something in prepareForSegue as well as a variable in your second view controller. So in your table view controller:

var variableToPass: String!

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    variableToPass = rowOfItems[indexPath.row].customlabel3!.text
    performSegueWithIdentifier("SecondControllerSegue", sender: nil)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "SecondControllerSegue" {
        let destinationController = segue.destinationViewController as! SecondViewController
        destinationController.passedVariable = variableToPass
    } 
}

And in your second view controller you'll want to add the variable that the value will be passed to:

var passedVariable: String!

You can, of course, choose to replace the variable with whatever type you wish to send :)

Upvotes: 1

glyuck
glyuck

Reputation: 3397

You can add your custom logic in prepareForSegue like this:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let controller = segue.destinationViewController as? YourSecondController,
            indexPath = tableView.indexPathForSelectedRow() {
        controller.someVariable = rowOfItems[indexPath.row].customlabel3!
    }
}

Replace YourSecondController with class name for second view controller.

Don't forget to create IBOutlet for your UITableView and name it tableView.

Upvotes: 1

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