Passing Data from Tableview to Viewcontroller in Swift

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.

ios Swift: Passing data from tableView to view controller

You don't need to implement didSelectRow just to pass data through a segue. Assuming you're using Storyboards.

1. CTRL drag from the prototype TableViewCell in your storyboard to the ViewController you want to pass data to.

2. Choose Show for the segue type and give it an identifier

3. Do this in prepareForSegue:

   if segue.identifier == "catView" {
       if let indexPath = self.tableView.indexPathForSelectedRow {
           let controller = segue.destinationViewController as! YourViewController
           let value = values[indexPath.row]
           controller.catTitleRec = value["NAME"] as! String
   }
   

Swift 4: Passing Data from Tableview to ViewController

Your problem seems simple:

var image = [UIImage]()   // lost here

That's an ARRAY of images.

Suggest for a single item, you want a single image?

var image:UIImage!

Warning, will crash if image is nil when used. (alternate use UIImage? but must unwrap).

Therereby, in the table view controller..

vc.image = foodImage[indexPath.section][indexPath.row]

Will be behave as expected. No need to use:

self.itemImage.image = UIImage(named: image) //not working!!! Cant seem to find the right code for this from converting UIIMAGE to String. I am just lost!

(Which is incorrect because you're trying to use an array of images to pass to the STRING parameter of load image from file.)

Just use:

self.itemImage.image = self.image

As they are both image types.

You do the correct thing in the cell and index the array within the array to get the image, so do the same here and have a singe image type in your detail view controller. In that way if you click beef, the image for beef is sent.

As an aside, consider using a data model type for your recipe.

class Ingredient {
var name:String = ""
var image:UIImage! = nil
var count:Int = 0
var calories:Int = 0

public init(name: String, image: UIImage, count: Int, calories: Int) {
self.name = name
self.image = image
self.count = count
self.calories = calories
}
}

then you can do say:

let ingredients = [Ingredient("Beef", beefImage, 100, 350), Ingredient("Onion", onionImage, 1, 20)]

or etc,

Passing data from table view cell to new view controller error

You should trigger this way

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    self.performSegue(withIdentifier: "toUser", sender: indexPath.row)
}

and in prepare for segue

override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
    let selectedRow = sender as? Int
    if let name = usersArray[selectedRow!].firstLastName{
        destination.name = name
    }
}

How pass data from button in TableViewCell to View Controller?

Function @IBAction func infoButtonAction(_ sender: Any) {} should be in the ProductListCell

When that button is tapped, connect with the ProductListVC by delegate or closure to get the selected product.

Update

Using delegate:
Update your ProductListCell

import UIKit
import SDWebImage
import Firebase

protocol ProductListCellDelegate: class {
    func onTouchInfoButton(from cell: ProductListCell)
}

class ProductListCell: UITableViewCell {

      @IBOutlet weak var productImage: UIImageView!
      @IBOutlet weak var dispensaryName: UILabel!
      @IBOutlet weak var productName: UILabel!
      @IBOutlet weak var thcPercent: UILabel!
      @IBOutlet weak var cbdPercent: UILabel!
      @IBOutlet weak var categoryLabel: UILabel!
      @IBOutlet weak var categoryStrain: UILabel!

      @IBOutlet weak var moreInfo: RoundButton!
      weak var product: Product!
      weak var delegate: ProductListCellDelegate?

      func configure(withProduct product: ProductList) {
          self.product = product
          productName.text = "\(String(describing: product.brand)): \(String(describing: product.name))"
          dispensaryName.text = product.dispensaryName
          categoryLabel.text = product.category
          productImage.sd_setImage(with: URL(string: product.imageUrl))
          cbdPercent.text = product.cbd
          thcPercent.text = product.thc
          categoryStrain.text = product.strain
      }

      @IBAction func infoButtonAction(_ sender: Any) {
          self.delegate?.onTouchInfoButton(from: self)
      }
}

In your ProductListVC:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProductListCell") as?
    ProductListCell else { return UITableViewCell() }

    cell.configure(withProduct: productSetup[indexPath.row])

    cell.delegate = self

    return cell
}

extension ProductListVC: ProductListCellDelegate {
     func onTouchInfoButton(from cell: ProductListCell) {
        let selectedProduct = cell.product
        // Do your stuff here 
     }
}

UPDATE

Because you use segue for navigation so let's create a variable to store your selected product in your ProductListVC

import UIKit
    import Firebase
    import FirebaseFirestore

    class ProductListVC: UIViewController {

        @IBOutlet weak var productListTableView: UITableView!

        var productInventory: [ProductList] = []
        var productSetup: [ProductList] = []
        var selectedProduct: Product?

        override func viewWillAppear(_ animated: Bool) {
            super.viewWillAppear(animated)
        }

        override func viewDidLoad() {
            super.viewDidLoad()

            productListTableView.dataSource = self
            productListTableView.delegate = self
            searchBar.delegate = self

            fetchProducts { (products) in
                self.productSetup = products
                self.productListTableView.reloadData()
            }

        }
       func fetchProducts(_ completion: @escaping ([ProductList]) -> Void) {
           let ref = Firestore.firestore().collection("products")
      ref.addSnapshotListener { (snapshot, error) in
                guard error == nil, let snapshot = snapshot, !snapshot.isEmpty else {
                    return
                }
                completion(snapshot.documents.compactMap( {ProductList(dictionary: $0.data())} ))
            }
        }

            override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            if let vc = segue.destination as? MoreInforVC {
            vc.product = self.selectedProduct
            }
        }
    }

    extension ProductListVC: UITableViewDelegate, UITableViewDataSource {
        func numberOfSections(in tableView: UITableView) -> Int {
            return 1
        }
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

            return productSetup.count
        }

        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            guard let cell = tableView.dequeueReusableCell(withIdentifier: "ProductListCell") as?
    ProductListCell else { return UITableViewCell() }

             cell.configure(withProduct: productSetup[indexPath.row])

             cell.delegate = self

          return cell
      }

  }

  extension ProductListController: ProductListCellDelegate {
      func onTouchInfoButton(from cell: ProductListCell) {
          self.selectedProduct = cell.product
          self.performSegue(withIdentifier: "YourSegueIdentifier", sender: self)
      }
  }

Pass data from tableView Cell to another view controller using delegate protocol

Just simply take a variable for value to be passed in your another Viewcontroller, then while pushing just pass the value.

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
    let vc = self.storyboard.instantiateViewController(withIdentifier: "AnotherVC") as! AnotherVC
    vc.variable = your value
    self.navigationController?.pushViewController(vc, animated: true)
}

Why do you need to use protocols?

How to pass data from a table view cell class back to view controller with the table view?

Use a closure to call back button action from cell to view controller.

CustomCell

class CustomCell : UITableViewCell {

    var ClousureBtnActionHandler:((_ sender: AnyObject) -> Void)?


    @IBAction func btnInfoActionHandler(_ sender : AnyObject) {
        if self.ClousureBtnActionHandler != nil {
            self.ClousureBtnActionHandler!(sender)
        }
    }
}

ViewController

TableView Datasource

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell : CustomCell = tableView.dequeueReusableCell(withIdentifier: "CustomCell") as! CustomCell
        cell.ClousureBtnActionHandler = { sender in
            print("Do any thing with your button action")
        }
    }

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

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