How to pass data from view controller to other view controller

Question

i’m newbie in swift language and i want to pass the price from the Item view controller to other controller (Payment view controller) using array. Can anyone help me? Thank you

Here the code for the item detail view controller

import UIKit


class ItemDetailViewController: UIViewController {

     var items = [item]()

    var name : String = ""
    var price : String = ""
    var imagee : String = ""

    @IBOutlet weak var labelname: UILabel!

    @IBOutlet weak var image: UIImageView!

    @IBOutlet weak var labelprice: UILabel!

// This one got error. 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        var DestViewController : PaymentViewController = segue.destination as! PaymentViewController

        DestViewController.price = labelprice?[IndexPath.text]

    }

    @IBAction func addtoPayment(_ sender: Any) {



        }



    override func viewDidLoad() {
        super.viewDidLoad()

        labelname.text = name
        labelprice.text = price
        image.image = UIImage(named: imagee)

    }


}

And here the code for the payment

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()
    }

}

It shows, value of type ‘UILabel’ has no subscripts @Sweeper — New user, May 23 '20 at 14:49
`DestViewController.price = labelprice?.text` // [IndexPath.text] — Jawad Ali, May 23 '20 at 14:50
If i change it to labelprice?.text it shows errors value of optional ‘String?’ must be unwrapped to a value of type ‘String’ @jawadAli — New user, May 23 '20 at 14:53
if let lText = labelprice?.text { DestViewController.price = lText } — Jawad Ali, May 23 '20 at 14:57
It works! Thanks ,and i have 1 more question how about pass the price from the table view? @jawadAli — New user, May 23 '20 at 15:21
I tried the same way like you mention before, but it error “Value of type [String] has no member ‘text’ @jawadAli — New user, May 23 '20 at 15:32

score 0 · Accepted Answer · answered May 23 '20 at 15:00

you can use this code ... try to use first letter small for objects

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        var destViewController : PaymentViewController = segue.destination as! PaymentViewController

        if let lText = labelprice?.text {
          destViewController.price = lText
     }

    }

score 0 · Answer 2 · answered May 23 '20 at 15:01

0

If you want to unwrap: DestViewController.price = labelprice?.text ?? “”

This way is not recommended but you can use DestViewController.price = labelprice!.text

Search for unwarp in Swift

answered May 23 '20 at 15:01

Bac Tran

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How to pass data from view controller to other view controller

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