iOS GCM notification sending, but not showing - ios

Question

I'm trying to implement GCM in my iOS app. Everything seems to work fine, the app is connecting to GCM and getting a registration ID back. If I send a notification to that regid using Postman it works and I get a success response back from Google. However, whatever I try, the notification isn't actually shown on the device.
The post messsage to the GCM servers I'm using is
{
"to" : "RegID",
"content_available" : true,
"notification" : {
"body" : "Test Body",
"title" : "Test Title"
}
}
which gives me the response:
{
"multicast_id": 6594175386712804014,
"success": 1,
"failure": 0,
"canonical_ids": 0,
"results": [
{
"message_id": "0:1443445858075083%c4cfa24dc4cfa24d"
}
]
}
This makes me believe there is something wrong with the code in my app. Below I've pasted all the relevant code. I've written the code 3 times without success, first following the tutorial and editing it to fit in my app properly, second time I copied the code from the tutorial and the third time I got the example app from the Github repo and copied everything relevant to GCM over.
AppDelegate:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var connectedToGCM = false
var gcmSenderID: String?
var registrationToken: String?
var registrationOptions = [String: AnyObject]()
let defaults = NSUserDefaults.standardUserDefaults()
let registrationKey = "onRegistrationCompleted"
let messageKey = "onMessageReceived"
let notification = "isNotificationEnabled"
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Google Cloud Messaging
var configureError:NSError?
GGLContext.sharedInstance().configureWithError(&configureError)
assert(configureError == nil, "Error configuring Google services: \(configureError)")
gcmSenderID = GGLContext.sharedInstance().configuration.gcmSenderID
var types: UIUserNotificationType = UIUserNotificationType.Badge |
UIUserNotificationType.Alert |
UIUserNotificationType.Sound
var settings: UIUserNotificationSettings =
UIUserNotificationSettings( forTypes: types, categories: nil )
application.registerUserNotificationSettings( settings )
application.registerForRemoteNotifications()
var gcmConfig = GCMConfig.defaultConfig()
GCMService.sharedInstance().startWithConfig(gcmConfig)
return true
}
func applicationDidBecomeActive(application: UIApplication) {
GCMService.sharedInstance().connectWithHandler({
(NSError error) -> Void in
if error != nil {
println("Could not connect to GCM: \(error.localizedDescription)")
} else {
self.connectedToGCM = true
println("Connected to GCM")
// ...
}
})
}
func application( application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken
deviceToken: NSData ) {
println(deviceToken)
// [END receice_apns_token]
// [START get_gcm_reg_token]
// Create a config and set a delegate that implements the GGLInstaceIDDelegate protocol.
var instanceIDConfig = GGLInstanceIDConfig.defaultConfig()
// Start the GGLInstanceID shared instance with that config and request a registration
// token to enable reception of notifications
GGLInstanceID.sharedInstance().startWithConfig(instanceIDConfig)
registrationOptions = [kGGLInstanceIDRegisterAPNSOption:deviceToken,
kGGLInstanceIDAPNSServerTypeSandboxOption:true]
GGLInstanceID.sharedInstance().tokenWithAuthorizedEntity(gcmSenderID,
scope: kGGLInstanceIDScopeGCM, options: registrationOptions, handler: registrationHandler)
// [END get_gcm_reg_token]
}
func registrationHandler(registrationToken: String!, error: NSError!) {
if (registrationToken != nil) {
self.registrationToken = registrationToken
println("Registration Token: \(registrationToken)")
let userInfo = ["registrationToken": registrationToken]
NSNotificationCenter.defaultCenter().postNotificationName(
self.registrationKey, object: nil, userInfo: userInfo)
} else {
println("Registration to GCM failed with error: \(error.localizedDescription)")
let userInfo = ["error": error.localizedDescription]
NSNotificationCenter.defaultCenter().postNotificationName(
self.registrationKey, object: nil, userInfo: userInfo)
}
}
func onTokenRefresh() {
// A rotation of the registration tokens is happening, so the app needs to request a new token.
println("The GCM registration token needs to be changed.")
GGLInstanceID.sharedInstance().tokenWithAuthorizedEntity(gcmSenderID,
scope: kGGLInstanceIDScopeGCM, options: registrationOptions, handler: registrationHandler)
}
func application( application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
println("Notification received: \(userInfo)")
// This works only if the app started the GCM service
GCMService.sharedInstance().appDidReceiveMessage(userInfo);
// Handle the received message
// Invoke the completion handler passing the appropriate UIBackgroundFetchResult value
// [START_EXCLUDE]
NSNotificationCenter.defaultCenter().postNotificationName(messageKey, object: nil,
userInfo: userInfo)
}
If anyone asked a similar question before let me know, I wasn't able to find one that described my situation properly.
Thanks in advance!

Answer 1

You haven't implemented the appropriate notification callback. You need to implement
func application(_ application: UIApplication,
didReceiveRemoteNotification userInfo: [NSObject : AnyObject],
fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
// Do something with userInfo
// call fetchCompletionHandler with the appropriate UIBackgroundFetchResult
}
Silent Push Notifications(i.e. ones with content-available flag set) call the above UIApplicationDelegate method instead of application:didReceiveRemoteNotification:.
Also make sure you've added remote-notification value to the UIBackgroundModes in your Info.plist.