SRMR SRMR - 10 days ago 5
Swift Question

Watch Connectivity works the first time but not after that

I've tested on the Simulator and Device, somehow Watch Connectivity stops working after it's used once.

I'm passing data from Watch -> iPhone, and it only works once and then stops after that.

Any ideas?



var session: WCSession?

override func viewDidLoad() {
if WCSession.isSupported() {
session = WCSession.default()
session?.delegate = self

func session(_ session: WCSession, didReceiveApplicationContext applicationContext: [String : Any]) {
// Received Application Context from Watch
let type = applicationContext["watchType"]
print("Type iPhone: \(type)")

DispatchQueue.main.async {
self.type.text = "Type: \(type)"



let session = WCSession.default()

override func awake(withContext context: Any?) {
super.awake(withContext: context)

if WCSession.isSupported() {
session.delegate = self

@IBAction func startPressed() {

func saveEverything() {
let watchContextType = ["watchType" : "Boxing/Running"]

do {
print("Type Watch: \(watchContextType)")
try session.updateApplicationContext(watchContextType)
} catch {
print("Didn't work")


When you use the updateApplicationContext(), you need to change the parameters for each call, otherwise the msg will not be delivered. I belive this is to conserve battery.

Anyway, try sending your message using sendMessage()or sendMessageData(), then the messages get delivered each time, even when they have the same contents. And, they are higher priority than updateApplicationContext so it's win-win :)

Here is the documentation: