Airplane mode on watchOS

WatchOS does not provide a public API that allows you to directly control the airplane mode settings programmatically using Swift.

However, you can use the WCSession framework to communicate between an Apple Watch and a paired iPhone app. This framework might indirectly help you determine if the iPhone is in airplane mode, but you won't be able to directly toggle the airplane mode state.

Here's how you might use WCSession to determine if the iPhone is in airplane mode:

1. Set up the WCSession in your WatchKit extension:

import WatchConnectivity

class InterfaceController: WKInterfaceController, WCSessionDelegate {
    override func awake(withContext context: Any?) {
        super.awake(withContext: context)
        
        if WCSession.default.isReachable {
            WCSession.default.delegate = self
            WCSession.default.activate()
        }
    }
    
    // WCSessionDelegate methods...
}

1. On the iOS side (the iPhone app), implement the corresponding delegate method to handle the message and provide the airplane mode status:

import WatchConnectivity

class ViewController: UIViewController, WCSessionDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if WCSession.isSupported() {
            let session = WCSession.default
            session.delegate = self
            session.activate()
        }
    }
    
    // WCSessionDelegate methods...
    
    func session(_ session: WCSession, didReceiveMessage message: [String : Any]) {
        if let airplaneModeStatus = message["airplaneModeStatus"] as? Bool {
            if airplaneModeStatus {
                print("iPhone is in airplane mode.")
            } else {
                print("iPhone is not in airplane mode.")
            }
        }
    }
}

1. In your watchOS code, you can send a message to the iPhone app to request the airplane mode status:

func requestAirplaneModeStatus() {
    if WCSession.default.isReachable {
        let message = ["requestAirplaneMode": true]
        WCSession.default.sendMessage(message, replyHandler: { response in
            // Handle the response from the iPhone app
        }, errorHandler: { error in
            // Handle any errors
        })
    }
}

Remember that this approach doesn't directly toggle airplane mode but rather communicates the status between the watchOS app and the paired iPhone app.