Container View とMainView間でのデータ交換

Container View とMainView間でのデータ交換をNotificationCenterで実施する。

メインの ViewController

import UIKit

class OrigViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default.addObserver(self, selector: #selector(onNotification(notification:)), name: .notifyName, object: nil)
    }
    
    @objc func onNotification(notification:Notification)
    {
        print("OrigViewController: onNotification called")
        
        label1.text = notification.userInfo?["data"] as? String
    }
    
    
    @IBOutlet weak var label1: UILabel!
    @IBAction func mainButtonPressed(_ sender: Any) {
        
        NotificationCenter.default.post(name: .notifyName,
                                        object: nil,
                                        userInfo: ["data": "data from OrigViewController", "isImportant": true])
    }
}

extension Notification.Name {
    static let notifyName = Notification.Name("notifyName")
}

Containerの ViewController

import UIKit

class ContainerViewController1: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default.addObserver(self, selector: #selector(onNotification(notification:)), name: .notifyName, object: nil)
    }
    
    @objc func onNotification(notification:Notification)
    {
        print("ContainerViewController1: onNotification called")
        
        label1.text = notification.userInfo?["data"] as? String
        
    }
    
    @IBOutlet weak var label1: UILabel!
    @IBAction func button1Pressed(_ sender: Any) {
        NotificationCenter.default.post(name: .notifyName,
                                        object: nil,
                                        userInfo: ["data": "data from Container", "isImportant": true])
    }
}