passing data from button in cell to another tableview? - ios

Question

how do I pass data from button in menu tableview to cart tableview?
would I segue it, use closures, protocol/delegates, something else?
Im having trouble passing data from my AddtoCart Button in my MenuViewController to CartViewController
the objective is to put items in the CartVC when the ATC button is pressed in the MenuCell
The CartButton on the NavBar in the MenuVC segues to the CartVC when pressed
The ATC button in the cell passes all the selected cells data to the cartVC (image, name, category, weight & price)
Im using Cloud Firestore to post data to populate my VC cells
I have tried so many different solutions posted on stack and still nothing seems to works, I have been stuck on this for almost 2 weeks... any help would be much much appreciated
import UIKit
import SDWebImage
import Firebase
class MenuCell: UITableViewCell {
weak var items: Items!
#IBOutlet weak var name: UILabel!
#IBOutlet weak var category: UILabel!
#IBOutlet weak var productImage: UIImageView!
#IBOutlet weak var weight: UILabel!
#IBOutlet weak var price: UILabel!
#IBOutlet weak var addToCart: RoundButton!
func configure(withItems items: Items) {
name.text = items.name
category.text = items.category
image.sd_setImage(with: URL(string: items.image))
price.text = items.price
weight.text = items.weight
self.items = items
}
}
import UIKit
import Firebase
import FirebaseFirestore
class MenuViewController: UITableViewController {
#IBOutlet weak var cartButton: BarButtonItem!!
#IBOutlet weak var tableView: UITableView!
var itemSetup: [Items] = []
override func viewDidLoad() {
super.viewDidLoad()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return itemSetup.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "MenuCell") as? MenuCell else { return UITableViewCell() }
cell.configure(withItem: itemSetup[indexPath.row])
return cell
}
}
extension CartViewController: UITableViewDataSource, UITableViewDelegate {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Cart.currentCart.cartItems.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CartCell", for: indexPath) as! CartCell
let cart = Cart.currentCart.CartItems[indexPath.row]
cell.lblWeight.text = cart.items.weight
cell.lblMealName.text = "\(cart.items.category): \(cart.items.name)"
cell.lblSubTotal.text = "$\(cart.items.price)"
cell.imageUrl // can't figure out how to pass image
return cell
}
}
class CartItem {
var items: Items
init(items: Items) {
self.items = items
}
}

Answer 1

The first thing I would do is get rid of CartItem - It doesn't seem to be doing anything except wrapping an Items instance, and you have some confusion in your code as to whether you are using CartItem or Items (I would probably also rename Items to Item - singular).
class Cart {
static let currentCart = Cart()
var cartItems = [Items]()
}
To get the "add to cart" action from your cell you can use a delegation pattern or provide a closure to handle the action. I will use a closure
class MenuCell: UITableViewCell {
#IBOutlet weak var name: UILabel!
#IBOutlet weak var category: UILabel!
#IBOutlet weak var productImage: UIImageView!
#IBOutlet weak var weight: UILabel!
#IBOutlet weak var price: UILabel!
#IBOutlet weak var addToCart: RoundButton!
var addActionHandler: (() -> Void)?
func configure(withItems items: Items) {
name.text = items.name
category.text = items.category
image.sd_setImage(with: URL(string: items.image))
price.text = items.price
weight.text = items.weight
}
#IBAction func addTapped(_ sender: UIButton) {
self.addActionHandler?()
}
}
Now, in your menu cellForRowAt you can provide the action handler:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "MenuCell") as! MenuCell // Just crash at this point if there isn't a valid cell identifier configured
let item = itemSetup[indexPath.row]
cell.configure(withItem: item)
cell.addActionHandler = {
Cart.currentCart.items.append(item)
}
return cell
}
And that should be all you need to do - When you segue to the cart view controller, it will show the current contents of the cart.
Note that you could improve your cart data model somewhat by allowing it to have a quantity for each item and providing an add(item:) function that incremented the quantity if the item was in the cart