CODEWITHSUNDEEP
iosswiftxcodecocoa-touch
shampouya
shampouya

Reputation: 406

How do I set the text on my UILabel on one ViewController to pull from another ViewController?

I created a UILabel called order1label on my ThirdViewController.

I want text to be displayed on that label based on what is decided in my SecondViewController.

Below is the code for those two view controllers. When I click on the Submit UIButton in the SecondViewController, I expect the orderType to change to Delivery on the ThirdViewController, and I expect that to be reflected in order1label, but it is not. It still says Takeout.

What am I doing incorrectly? I've been searching for answers for hours and there does not appear to be a simple solution to this extremely simple problem.

import UIKit

class SecondViewController: UIViewController{
    var orderType = "Takeout"

    @IBAction func SubmitOrderClicked(sender: UIButton) {
        orderType = "Delivery"
    }

}

Here is the code for my ThirdViewController:

import UIKit

class ThirdViewController: UIViewController {

    var orderTextController = SecondViewController().orderType

    override func viewDidLoad() {
        super.viewDidLoad()
        order1Label.text = orderTextController
    }

    override func viewWillAppear(animated: Bool) {
        order1Label.text = orderTextController
    }

    @IBOutlet var order1Label: UILabel!

}

Upvotes: 2

Views: 85

Answers (3)

Md. Ibrahim Hassan
Md. Ibrahim Hassan

Reputation: 5467

Declare a global variable orderType in SecondViewController like:

import UIKit

var orderType = "Takeout"

class SecondViewController: UIViewController{
@IBAction func SubmitOrderClicked(sender: UIButton) {
    orderType = "Delivery"
}

}

Here is the code the ThirdViewController:

import UIKit

class ThirdViewController: UIViewController {


override func viewWillAppear() {
    super.viewWillAppear()
    order1Label.text = orderType
}

@IBOutlet var order1Label: UILabel!

}

Hope this satisfies your requirements. Happy coding.

Upvotes: 1

Ding Qiu
Ding Qiu

Reputation: 64

your problem is only because the label in thirdController needs to be informed after the text is changed in secondController. After changed your text by clicking the button, you need to inform the label in thirdController to also change the text. There are several ways that you can achieve that, delegate, notification, block and so on. If you have further question about using any of ways above please tell me.

Upvotes: 0

carlos21
carlos21

Reputation: 485

I'm supposing that you want to present ThirdViewController when tapping the button on SecondViewController, so you'd need to change the code to:

import UIKit

class SecondViewController: UIViewController{
    var orderType = "Takeout"

@IBAction func SubmitOrderClicked(sender: UIButton) {
    orderType = "Delivery"
    let thirdController = ThirdViewController()
    thirdController.order1Label.text = orderType
    self.present(thirdController, animated: true, completion: nil)
}

}

When you call present, the view controller you specify will load and will enter to viewDidLoad. You'd also need to remove this

var orderTextController = SecondViewController().orderType

Upvotes: 1

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