Delegate using Container View in Swift

Question

I'm developing an app for iPad Pro. In this app, containerView use to add additional views and interact with them.

First, I created a protocol:

protocol DataViewDelegate {
    func setTouch(touch: Bool)
}

Then, I created my first view controller

import UIKit

class ViewController: UIViewController, DataViewDelegate {

    @IBOutlet var container: UIView!
    @IBOutlet var labelText: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func setTouch(touch: Bool) {
        if touch == true {
            labelText.text = "Touch!"
        }
    }

}

And finally, I created a view that will be embedded in containerView.

import UIKit

class ContainerViewController: UIViewController {

    var dataViewDelegate: DataViewDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func touchMe(sender: AnyObject) {
        dataViewDelegate?. setTouch(true)
    }

}

But for some reason, nothing happened, the first view controller receives nothing in setTouch function.

My question is: In this case, using container, how can I make the communication between two ViewsControllers?

Answer 1

Looks like you defined the delegate, but have not set the delegate. This happens to me all the time.