Adobe Analytics

var canSendCSMatchingKey = false

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // ... your existing code ..
    MobileCore.registerExtensions([Identity.self, Analytics.self, ....], {
        // ... your existing code ..

        self.canSendCSMatchingKey = true
        self.sendCSMatchingKeyIfNeeded()
    })

    // When going back to foreground, more than 30 minutes may have elapsed.
    // In this situation Contentsquare SDK may create a new session
    // This is why `sendCSMatchingKeyIfNeeded` must be called in this situation
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(sendCSMatchingKeyIfNeeded),
                                           name: UIApplication.didBecomeActiveNotification,
                                           object: nil)

    // ... your existing code ..
}

@objc
func sendCSMatchingKeyIfNeeded() {
  guard canSendCSMatchingKey else { return }

  let csMatchingKeyTimestampKey = "csMatchingKey_ts"
  let csMatchingKeyValidityMs = 1_800_000 // 30 minutes

  let currentTimestamp = Int(Date().timeIntervalSince1970 * 1000)
  let csMatchingKeyIsPreviousTimestamp = UserDefaults.standard.integer(forKey: csMatchingKeyTimestampKey)

  guard (currentTimestamp - csMatchingKeyIsPreviousTimestamp) > csMatchingKeyValidityMs else {
    return
  }

  UserDefaults.standard.set(currentTimestamp, forKey: csMatchingKeyTimestampKey)

  let csMatchingKey = "csMatchingKey"
  let csMatchingKeyValue = "\(Double.random(in: 0..<1))_\(currentTimestamp)"

  CSQ.addDynamicVar(dynamicVar: DynamicVar(key: csMatchingKey, value: csMatchingKeyValue))
  MobileCore.track(state: "csMatchingKey_state", data: [csMatchingKey: csMatchingKeyValue])
}