Passing Data Between View Controllers: from UItableview to a Details View Controller

Passing data from view controller to table view controller in ios swift 2

You have to declare String variable in your 3rd View Controller (Table View Controller) like

var myString: String = ""

override func viewDidLoad() {
    super.viewDidLoad()
}

You can assign value to myString variable from your first view controller like

let DestViewController:tableviewcontroller = segue.destinationViewController as! tableviewcontroller
DestViewController.myString = labelText.text!

And your your tableview view method will be like

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell1 = tableView.dequeueReusableCellWithIdentifier("cell1", forIndexPath: indexPath)
    cell1.textLabel!.text = myString
    return cell1
}

The Above is the solution, below i am explaining what was the problem

There is no such text method for UITableview, hence you were getting error at

DestViewController.passdata = tblLable.text! //In first View Controller
cell1.textLabel!.text = tblLable.text! //In second View controller

Pass data between TableView and another ViewController in Swift

Your prepareForSegue must override the UIViewController method which is

func prepare(for segue: UIStoryboardSegue, sender: Any?)

Therefore your method in NewsfeedViewController should be

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    let secondViewController = segue.destination as? EventViewController
    secondViewController?.data = sender as? eventStruct
}

it would also be a good idea to add some error checking

Passing data from tableView to ViewController in Swift

Try this.

ModelViewViewController

var selectedImage:String?
var selectedLabel:String?

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        println("Row \(indexPath.row)selected")
        selectedImage = self.tableData[indexPath.row]
        selectedLabel = self.tableData[indexPath.row]
        performSegueWithIdentifier("detailView", sender: self)  
    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

        if(segue.identifier == "detailView") {
            var vc = segue.destinationViewController as DetailViewController 
           vc.img = selectedImage
           vc.lblDetail = selectedLabel
        }      
    }

class DetailViewController: UIViewController {                
    @IBOutlet var imgDetail: UIImage!                
    @IBOutlet var lblDetail: UILabel!
    var img:String?

override func viewDidLoad() {
        super.viewDidLoad()   
        // Do any additional setup after loading the view.

      imgDetail = UIImage(named: img)
    }

This should work.

How to pass data with index between view controllers programmaticallly?

You seem to be a long way off where you want to get to. Your second VC will need the able to render the content and at the moment it can do none of that. However to address the question of passing the data between VCs, the easier way would be to inject the data you need. There are many different approaches, but a simple one would be to...

Create a struct to hold the data you want, and then hold an array of these rather than an array of Strings as your primary data source. For example:

struct CountryInfo {
  let name: String
  let capital: String
  let flag: UIImage
  // etc...
}

and replace your myArray with an array of these structs populated with the appropriate data.

Then in your initial VC's cellForRowAt you can refer to the name property:

cell.textLabel!.text = "\(myArray[indexPath.row].name)"

In your second VC you will need a property that allows the appropriate struct to be injected and then referenced for display

class SecondViewController: UIViewController {
    var country: CountryInfo!

   //etc
}

Then you can inject the selected country's info into the second VC in didSelectRowAt

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
   let nextVC = SecondViewController()
   nextVC.country = myArray[indexPath.row]
   navigationController?.pushViewController(nextVC, animated: true)
}

Then all you have to do is display this data, which can be done from the second VC's viewDidLoad()

Passing Data from ViewController to UITableViewController

The solution

PIECE DEFINITIONS

ViewController.swift

import UIKit

class ViewController: UIViewController {

    var someData: String? = ""

    @IBOutlet weak var cpChoice: UISegmentedControl!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func startBut(_ sender: Any) {
        performSegue(withIdentifier: "startUp", sender: self)
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        //get the string representing the segment chosen and assign it to someData
        let theSegmentChosen = cpChoice.selectedSegmentIndex
        someData = cpChoice.titleForSegment(at: theSegmentChosen)

        let barVC = segue.destination as! UITabBarController //
        let navigationControllerDestination = barVC.viewControllers?[0] as? navVC //the array index [0] indicates the first view controller belonging to the TabBarController
        let firstViewControllerOfNavigationController = navigationControllerDestination?.topViewController as! CheckpointVC
        firstViewControllerOfNavigationController.data = someData!
    }
}

TabBarVC

import UIKit

class TabBarVC: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }
}

NavVC

import UIKit

class navVC: UINavigationController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

}

CheckpointVC.swift

import UIKit

class CheckpointVC: UITableViewController {

    //the variable we'll pass the data to from the starting viewcontroller
    var data: String = ""

    @IBOutlet weak var theHeader: UINavigationItem!

    override func viewDidLoad() {
        super.viewDidLoad()
        theHeader.title = data
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 10
    }
}

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