如何将数据从表视图传递到另一个视图控制器

Question

我是 Swift 语言的新手。我想将价格从表视图控制器传递到支付视图控制器

这是我的表格视图控制器代码

import UIKit

class MainMenuViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

    let labeltitle = ["ADLV Black Tee", "ASSC Black Hoodie", "CDG Play Gold Black Tee"]

    let labelprice = [("RM 250"), ("RM 305"), ("RM 418")]

    let myImage = [UIImage(named: "adlv1"), UIImage(named: "assc"), UIImage(named: "cdg1")]

    @IBOutlet weak var tableView: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()
        tableView.delegate = self
        tableView.dataSource = self


    }

//here got error 

    override func prepare(for segue: UIStoryboardSegue, sender: (Any)?){
        var DestinationViewController : PaymentViewController = segue.destination as! PaymentViewController

        if let lText = labelprice.text {
            DestinationViewController.price = lText
        }


    }

    @IBAction func BuyNowbutton(_ sender: Any) {


    }


    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return labeltitle.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! MainMenuTableViewCell


        cell.label11?.text = labeltitle[indexPath.row]

        cell.label2?.text = labelprice[indexPath.row]

        cell.myImage.image = self.myImage[indexPath.row]

        return cell
    }


}

这是我的付款视图控制器

import UIKit

class PaymentViewController: UIViewController {

    var items = [item]()
    var price : String = ""

    @IBOutlet weak var paymentdetails: UILabel!


    @IBOutlet weak var cardnametextfield: UITextField!


    @IBOutlet weak var validthrutextfield: UITextField!


    @IBOutlet weak var cardnumbertextfield: UITextField!

    @IBOutlet weak var cvcnumbertextfield: UITextField!

    @IBOutlet weak var labelprice: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
    labelprice.text = price


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


    @IBAction func paybutton(_ sender: Any) {

        if cardnametextfield.text == "" {
            alertMessage(titleInput: "Error, Payment Unsuccessful!", messageInput: "Please Fill all the fields")
        } else if validthrutextfield.text == "" {
            alertMessage(titleInput: "Error, Payment Unsuccessful!", messageInput: "Please Fill all the fields")
        } else if cardnumbertextfield.text == "" {
            alertMessage(titleInput: "Error, Payment Unsuccessful!", messageInput: "Please Fill all the fields")
        } else if cardnumbertextfield.text == "" {
        alertMessage(titleInput: "Error, Payment Unsuccessful!", messageInput: "Please Fill all the fields")
        } else {
            alertMessage(titleInput: "Success!", messageInput: "Payment Successful!")

            self.transitionToHomePage()
        }
    }

    func alertMessage(titleInput: String, messageInput: String){
        let alert = UIAlertController(title: titleInput, message: messageInput, preferredStyle: UIAlertController.Style.alert)
        let paybutton = UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil)

        alert.addAction(paybutton)
        self.present(alert, animated: true, completion: nil)
    }

    func transitionToHomePage(){
         let TabHomeViewController = storyboard?.instantiateViewController(identifier: Constrants.Storyboard.TabHomeViewController) as? UITabBarController

        view.window?.rootViewController = TabHomeViewController
        view.window?.makeKeyAndVisible()
    }

}

Answer 1

首先你应该创建一个结构

struct Item {
  let title,price,imageName:String
}

不是 3 个数组而是 1 个

var arr = [Item]() 

然后填写

第二

override func prepare(for segue: UIStoryboardSegue, sender: (Any)?){
    var des = segue.destination as! PaymentViewController 
    if let row = tableView.indexPathForSelectedRow?.row {
        des.price = arr[row].price
    } 
}

最后从tableView连接segue而不是从cell拖到目标vc，然后在table dp的didSelectRowAtdelegate方法中

self.performSegue(withIdentifier:"SegueNameHere",sender:nil)