Make sure watch extension code runs on main queue. (#675)

Author: ps2

WatchApp Extension/Controllers/AddCarbsInterfaceController.swift

@@ -163,10 +163,14 @@ final class AddCarbsInterfaceController: WKInterfaceController, IdentifiableClas
             do {
                 try WCSession.default.sendCarbEntryMessage(entry,
                     replyHandler: { (suggestion) in
-                        WKExtension.shared().rootInterfaceController?.presentController(withName: BolusInterfaceController.className, context: suggestion)
+                        DispatchQueue.main.async {
+                            WKExtension.shared().rootInterfaceController?.presentController(withName: BolusInterfaceController.className, context: suggestion)
+                        }
                     },
                     errorHandler: { (error) in
-                        ExtensionDelegate.shared().present(error)
+                        DispatchQueue.main.async {
+                            ExtensionDelegate.shared().present(error)
+                        }
                     }
                 )
             } catch {

WatchApp Extension/Controllers/BolusInterfaceController.swift

@@ -137,7 +137,9 @@ final class BolusInterfaceController: WKInterfaceController, IdentifiableClass {
 
             do {
                 try WCSession.default.sendBolusMessage(bolus) { (error) in
-                    ExtensionDelegate.shared().present(error)
+                    DispatchQueue.main.async {
+                        ExtensionDelegate.shared().present(error)
+                    }
                 }
             } catch {
                 presentAlert(

WatchApp Extension/Controllers/StatusInterfaceController.swift

@@ -244,29 +244,34 @@ final class StatusInterfaceController: WKInterfaceController, ContextUpdatable {
         do {
             try WCSession.default.sendGlucoseRangeScheduleOverrideMessage(userInfo,
                 replyHandler: { _ in
-                    self.pendingMessageResponses -= 1
-                    if self.pendingMessageResponses == 0 {
-                        self.updateForOverrideContext(userInfo?.context)
+                    DispatchQueue.main.async {
+                        self.pendingMessageResponses -= 1
+                        if self.pendingMessageResponses == 0 {
+                            self.updateForOverrideContext(userInfo?.context)
+                        }
+                        self.lastOverrideContext = userInfo?.context
                     }
-                    self.lastOverrideContext = userInfo?.context
                 },
                 errorHandler: { error in
-                    self.pendingMessageResponses -= 1
-                    if self.pendingMessageResponses == 0 {
-                        self.updateForOverrideContext(self.lastOverrideContext)
+                    DispatchQueue.main.async {
+                        self.pendingMessageResponses -= 1
+                        if self.pendingMessageResponses == 0 {
+                            self.updateForOverrideContext(self.lastOverrideContext)
+                        }
+                        ExtensionDelegate.shared().present(error)
                     }
-                    ExtensionDelegate.shared().present(error)
                 }
             )
         } catch {
             pendingMessageResponses -= 1
             if pendingMessageResponses == 0 {
                 updateForOverrideContext(lastOverrideContext)
             }
-            presentAlert(withTitle: NSLocalizedString("Send Failed", comment: "The title of the alert controller displayed after a glucose range override send attempt fails"),
-                         message: NSLocalizedString("Make sure your iPhone is nearby and try again", comment: "The recovery message displayed after a glucose range override send attempt fails"),
-                         preferredStyle: .alert,
-                         actions: [WKAlertAction.dismissAction()]
+            presentAlert(
+                withTitle: NSLocalizedString("Send Failed", comment: "The title of the alert controller displayed after a glucose range override send attempt fails"),
+                message: NSLocalizedString("Make sure your iPhone is nearby and try again", comment: "The recovery message displayed after a glucose range override send attempt fails"),
+                preferredStyle: .alert,
+                actions: [WKAlertAction.dismissAction()]
             )
         }
     }

WatchApp Extension/ExtensionDelegate.swift

@@ -164,7 +164,7 @@ final class ExtensionDelegate: NSObject, WKExtensionDelegate {
 
 extension ExtensionDelegate: WCSessionDelegate {
     func session(_ session: WCSession, activationDidCompleteWith activationState: WCSessionActivationState, error: Error?) {
-        if activationState == .activated && lastContext == nil {
+        if activationState == .activated {
             updateContext(session.receivedApplicationContext)
         }
     }