Unable to get WiFi rssi value

I want to create a function which will return the rssi value of currently connected WiFi network on my iPhone. I tried fetching the value from status bar but I guess that support is no longer provided in Swift. I have tried the following solution and other solutions with similar approach but it doesn't seem to work now.

private func wifiStrength() -> Int? {
    let app = UIApplication.shared
    var rssi: Int?

    guard let statusBar = app.value(forKey: "statusBar") as? UIView, let foregroundView = statusBar.value(forKey: "foregroundView") as? UIView else {
        return rssi
    }

    for view in foregroundView.subviews {
        if let statusBarDataNetworkItemView = NSClassFromString("UIStatusBarDataNetworkItemView"), view .isKind(of: statusBarDataNetworkItemView) {
            if let val = view.value(forKey: "wifiStrengthRaw") as? Int {
                //print("rssi: \(val)")
                rssi = val
                break
            }
        }
    }

    return rssi
}