How to access values in UIViewController class from TableCell class in Swift? - ios

Question

So, I have a UIViewController(PledgeViewController) with a TableView. When the user clicks on a UIButton(plusBtn) in the UITableViewCell(PledgeTableViewCell) of the TableView, I want to perform a write to my firebase database. But to get the exact path, I need a String(getID) from the PledgeViewController class which is received with a segue from the previous ViewController. With the MVC format that I'm using, how do I access values in the PledgeViewController to write to the database from the PledgeTableViewCell?
My PledgeViewController.swift:
import UIKit
import Foundation
import FirebaseDatabase
import Firebase
class PledgeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
var getID: String!
#IBOutlet weak var pledgeAmtLabel: UILabel!
#IBOutlet weak var RewardChooseTable: UITableView!
#IBAction func pledgeBtn(_ sender: Any) {
//get the text from the label and run all the checks to see if the tickets are available
}
let RewardRef = Database.database().reference().child("Rewards")
var rewards = [Rewards]()
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return rewards.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TakePledgeCell", for: indexPath) as! PledgeTableViewCell
let reward = rewards[indexPath.row]
cell.reward = reward
return cell
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
RewardRef.child(getID).observe(.value, with: { (snapshot) in
self.rewards.removeAll()
for child in snapshot.children {
let childSnapshot = child as! DataSnapshot
let reward = Rewards(snapshot: childSnapshot)
self.rewards.insert(reward, at: 0)
}
self.RewardChooseTable.reloadData()
})
}
override func viewDidLoad() {
super.viewDidLoad()
print("The id received from the SingleViewControl is:" + getID)
}
}
My PledgeTableViewCell.swift:
import UIKit
import Firebase
import FirebaseDatabase
class PledgeTableViewCell: UITableViewCell {
#IBOutlet weak var rewardAmtLabel: UILabel!
#IBOutlet weak var ticketClasslabel: UILabel!
#IBOutlet weak var ticketDescLabel: UILabel!
#IBOutlet weak var ticketCountLabel: UILabel!
#IBOutlet weak var plusBtn: UIButton!
#IBOutlet weak var minusBtn: UIButton!
var ref: DatabaseReference!
var artcallid: Int!
#IBAction func minusBtn(_ sender: Any) {
}
var reward: Rewards! {
didSet {
rewardAmtLabel.text = "Rs. " + String(reward.rewardAmt)
ticketClasslabel.text = reward.reward_class_name
ticketDescLabel.text = reward.reward_desc
print(reward.reward_class_name + " is one of the rewards")
}
}
#IBAction func plusBtn(_ sender: AnyObject) {
}
}
Rewards.swift:
import Foundation
import Firebase
import FirebaseDatabase
class Rewards {
let ref: DatabaseReference!
// let countRef: DatabaseReference!
var rewardAmt: Int!
var rewardsLeft: Int!
var reward_class_name: String = ""
var reward_amt: String = ""
var reward_desc: String = ""
var rewardID: String = ""
var tickUpCount = 0
var tickDownCount = 0
init(text: String) {
ref = Database.database().reference().child("Fund").childByAutoId()
// countRef = Database.database().reference().child("Testing").childByAutoId()
}
init(snapshot: DataSnapshot)
{
ref = snapshot.ref
if let value = snapshot.value as? [String : Any] {
rewardAmt = value["reward_ticket_amount"] as! Int
reward_class_name = value["reward_ticket_amount_class_name"] as! String
reward_amt = value["reward_ticket_amount_txt"] as! String
reward_desc = value["reward_ticket_class_desc"] as! String
rewardsLeft = value["rewards_left"] as! Int
rewardID = snapshot.key
}
}
}
extension Rewards{
func countUp(){
tickUpCount += 1
ref.child("uppingTicket").setValue(tickUpCount)
}
}

Answer 1

You can try with closure
class PledgeTableViewCell: UITableViewCell {
//Define a closure
var closure:(() -> Void)? = nil
#IBAction func plusBtn(_ sender: AnyObject) {
// Do you stuff
closure?()
}
}
class PledgeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate{
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TakePledgeCell", for: indexPath) as! PledgeTableViewCell
let reward = rewards[indexPath.row]
cell.reward = reward
cell.closure = {
// You will get the callback in this block
// You can define the parameterized closure to return the value
}
return cell
}

Answer 2

You can try to add a new var
class PledgeTableViewCell: UITableViewCell {
var currentID = ""
}
and set it in cellForRowAt
cell.currentID = getID