Sharing data in between apps in IOS

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You can turn on App group on your App Project capabilities tab on both of your apps with the same group container ID. “group.com.yourCompanyID.sharedDefaults”

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Then you can access the same folder from your apps using the following url:

let sharedContainerURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.yourCompanyID.sharedDefaults")!

So if you would like to share a switch state from two different apps you should do it as follow:

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var sharedSwitch: UISwitch!
    let switchURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.yourCompanyID.sharedDefaults")!
        .appendingPathComponent("switchState.plist")
    override func viewDidLoad() {
        super.viewDidLoad()
        print(switchURL.path)
        NotificationCenter.default.addObserver(self, selector: #selector(updateSwitch), name: .UIApplicationDidBecomeActive, object: nil)
    }
    func updateSwitch(_ notofication: Notification) {
        sharedSwitch.isOn = NSKeyedUnarchiver.unarchiveObject(withFile: switchURL.path) as? Bool == true
    }
    @IBAction func switched(_ sender: UISwitch) {
        let success = NSKeyedArchiver.archiveRootObject(sender.isOn, toFile: switchURL.path)
        print(success)
    }
}

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