如何通过单击 TableCell 中的按钮将我的 TableCell 中的标签值传递给 TableViewController？ [关闭]

Posted 2023-03-14

【中文标题】如何通过单击 TableCell 中的按钮将我的 TableCell 中的标签值传递给 TableViewController？ [关闭]

【英文标题】：How to pass the value of a label in my TableCell to the TableViewController on the click of a button in the TableCell? [closed]

【发布时间】：2018-07-20 06:38:35

【问题描述】：

所以，我有一个带有 UITableView 的 ViewController(PledgeViewController) 和另一个名为 PledgeTableViewCell.swift 的文件，它是一个 UITableCell 文件。当有人单击 PledgeTableViewCell.swift 中的按钮（plsBtn）时，我设置了一个闭包，该闭包反馈到 PledgeViewController 并从那里处理我的操作。我现在想做的是：

当有人单击 PledgeTableViewCell 中的 plsBtn 时，我正在 PledgeViewController 中处理该操作。但我想在 indexPath 处读取 TableViewCell 中标签的值并将其发送到 PledgeViewController 以进行进一步计算。我可以用闭包本身来做到这一点还是有另一种方法？谢谢！

PledgeTableViewCell.swift：

import UIKit
import Firebase
import FirebaseDatabase


class PledgeTableViewCell: UITableViewCell 

    var plusBtnAction: ((Any) -> Void)?
    var minusBtnAction: ((Any) -> Void)?

    @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 currentID = ""
    var ticket_count: Int = 0
    let userID = Auth.auth().currentUser!.uid

    @IBAction func minusBtn(_ sender: Any) 

        if var tickCount = Int(ticketCountLabel.text!) 

            if(tickCount > 0)
            
                tickCount -= 1
                ticketCountLabel.text = String(tickCount)
            
        

        self.minusBtnAction?(sender)
    

    @IBAction func plusBtn(_ sender: AnyObject) 


        if var tickCount = Int(ticketCountLabel.text!) 

//I WANT TO SEND THIS 'TICKCOUNT' TO THE PLEDGEVIEWCONTROLLER
            tickCount += 1
            ticketCountLabel.text = String(tickCount)
        


        self.plusBtnAction?(sender)

    

PledgeViewController.swift：

import UIKit
import Foundation
import FirebaseDatabase
import Firebase

class PledgeViewController: UIViewController, UITableViewDataSource, UITableViewDelegate


    var getID: String!
    var rewards = [Rewards]()
    var ticket_count: Int = 0
    var ref: DatabaseReference!
    let userID = Auth.auth().currentUser!.uid
    var rewardID: 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

    

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) 
        /*  myIndex = indexPath.row

         finalId = idTable[myIndex]
         let story = stories[indexPath.row]
         ArtcallID = story.id

         performSegue(withIdentifier: "singleArtcall", sender: self)
         */
        let reward = rewards[indexPath.row]
        let id = reward.rewardID
        reward.countUp()

        print("The reward that was touched is: " + id )
        print("One of the buttons were touched")
    

    let RewardRef = Database.database().reference().child("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
        cell.currentID = getID
        rewardID = reward.rewardID

        cell.plusBtnAction =  sender in

            let reward = self.rewards[indexPath.row]
            cell.reward = reward
            let local_id = reward.rewardID

            self.ref=Database.database().reference().child("Fund_Project_Request").child(self.getID).child(self.userID).child(local_id).child("Ticket_count")


            self.ref.observeSingleEvent(of: .value, with:  (snapshot) in
                // Get user value

                if snapshot.value is NSNull
                    self.ticket_count = 0
                    self.ticket_count += 1
                    self.ref.setValue(self.ticket_count)
                

                else
                    self.ticket_count = snapshot.value as! Int
                    self.ticket_count += 1
                    self.ref.setValue(self.ticket_count)
                


            )  (error) in
                print(error.localizedDescription)
            

           Database.database().reference().child("Rewards").child(self.getID).child(local_id).child("reward_ticket_amount").observeSingleEvent(of: .value, with:  (snapshot) in
                // Get user value
                let reward_amt = snapshot.value as! Int

                self.pledgeAmtLabel.text = String(reward_amt)

            )  (error) in
                print(error.localizedDescription)
            

            // Do whatever you want from your button here.
        



        cell.minusBtnAction =  sender in

            let reward = self.rewards[indexPath.row]
            cell.reward = reward
            let local_id = reward.rewardID

        self.ref=Database.database().reference().child("Fund_Project_Request").child(self.getID).child(self.userID).child(local_id).child("Ticket_count")
            self.ref.observeSingleEvent(of: .value, with:  (snapshot) in
                // Get user value

                if snapshot.value is NSNull

                

                else

                    self.ticket_count = snapshot.value as! Int
                    if(self.ticket_count != 0)
                    
                        self.ticket_count -= 1
                        self.ref.setValue(self.ticket_count)
                    
                


            )  (error) in
                print(error.localizedDescription)
            



        



        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)

【参考方案1】：

您可以将标签值与发送者一起传递给闭包本身。

class PledgeTableViewCell: UITableViewCell 

    var plusBtnAction: ((String) -> Void)?
    var minusBtnAction: ((String) -> Void)?



     @IBAction func minusBtn(_ sender: Any) 

          if var tickCount = Int(ticketCountLabel.text!) 

            if(tickCount > 0)
            
                tickCount -= 1
                ticketCountLabel.text = String(tickCount)

            
            self.minusBtnAction?(tickCount)
        
    

    @IBAction func plusBtn(_ sender: AnyObject) 

        if var tickCount = Int(ticketCountLabel.text!) 

//I WANT TO SEND THIS 'TICKCOUNT' TO THE PLEDGEVIEWCONTROLLER
            tickCount += 1
            ticketCountLabel.text = String(tickCount)
            self.plusBtnAction?(ticketCount)
        

       
    

cellForRow:PledgeViewController 中的方法

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 

        let cell = tableView.dequeueReusableCell(withIdentifier: "TakePledgeCell", for: indexPath) as! PledgeTableViewCell
        .....
        cell.plusBtnAction =  labelText in
           //handle labelText here
        

【讨论】：

您能进一步解释一下吗？

我将如何在 PledgeViewController 中接收它？

添加的代码请检查。您可以在 celForRow

的闭包内处理

sender 和 Any 的使用在这里毫无意义。 plusBtnAction 和 minusBtnAction closures 应该传递单元格和文本，而不是发送者。

为什么它应该传递单元格引用？它已经在 cellForRow 中给出了单元格。