CODEWITHSUNDEEP
iosswiftwatchkitwatchconnectivity
David Robertson
David Robertson

Reputation: 1581

Get a dictionary from iPhone on Watch prior to launching the phone app - WC

I've faced an issue while trying to synchronise iPhone app and WatchKit app. The thing is - my WatchKit app tableView is appended by the data array from iPhone.

I'm using interactive messaging from Watch Connectivity framework

Establishing session

    if(WCSession.isSupported()){
        self.session = WCSession.defaultSession()
        self.session.delegate = self
        self.session.activateSession()
    }

sending message to WatchKit app

    do {
        let dataDict = ["data": dictionary1]
        try WCSession.defaultSession().updateApplicationContext(dataDict)
    }

    catch {
        print(error)
    }

and this is how i receive the message on the Watch

func session(session: WCSession, didReceiveApplicationContext applicationContext: [String : AnyObject]) {

    dispatch_async(dispatch_get_main_queue()) { () -> Void in


        if let retrievedArray1 = applicationContext["data"] as? [Int : Bool] {

            self.arrayOnWatch = retrievedArray1

        }
    }}

It works well with one exception - i cannot get the data array UNTIL i launch the app on the iPhone, which isn't a solution in my case.

Any ideas on how to transfer and receive the message without opening the actual phone app?

Thank you.

Upvotes: 2

Views: 257

Answers (1)

joern
joern

Reputation: 27620

Using the application context does not work for your case, because it needs the iPhone app to actively set the application context.

You can use WatchKit's sendMessage to let the watch ask the iPhone app for data.

In your ExtensionDelegate after activating the connection send a message to the iPhone app:

if WCSession.defaultSession().reachable {
    let messageDict = ["message": "hello iPhone!"]
    WCSession.defaultSession().sendMessage(messageDict, replyHandler: { (replyDict) -> Void in
        print(replyDict)
        }, errorHandler: { (error) -> Void in
        print(error)
    }
}

This will wake up your iPhone app in the background if the iPhone app is not running.

In your iPhone app's AppDelegate implement the corresponding WCSessionDelegate method (after activating the session in didFinishLauncingWithOptions:

func session(session: WCSession, didReceiveMessage message: [String : AnyObject], replyHandler: ([String : AnyObject]) -> Void) {
    replyHandler(["message": "Hello Watch!"])
}

Just send your data instead of "Hello Watch!" and your watch will have the data even if the iPhone app is not running.

Upvotes: 2

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