Why is the function in the appdelegate not being called? - ios

Question

I am trying to add the current user to the installation class, but for some reason the function is not being called. What am I doing wrong? How do I fix this? Below is both the finishlaunchingwithoptions and didregisterfornotifications.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
Parse.enableLocalDatastore()
// Initialize Parse.
Parse.setApplicationId("***********************",
clientKey: "****************************")
let settings = UIUserNotificationSettings(forTypes: [.Alert, .Sound, .Badge], categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)
UIApplication.sharedApplication().registerForRemoteNotifications()
if let launchOptions = launchOptions as? [String : AnyObject] {
if let notificationDictionary = launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey] as? [NSObject : AnyObject] {
self.application(application, didReceiveRemoteNotification: notificationDictionary)
}
}
return true
}
func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
// Store the deviceToken in the current Installation and save it to Parse
let installation = PFInstallation.currentInstallation()
installation.setDeviceTokenFromData(deviceToken)
installation["user"] = PFUser.currentUser()
installation.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
if (error == nil){
print("saved installation")
}else{
print(error)
}
})
}
func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError!) {
print("Couldn't register: \(error)")
}

Answer 1

The problem in this situation is that you're running in the iOS Simulator, which does not support remote notifications. So, your didRegisterForRemoteNotificationsWithDeviceToken will never be called, because you're in the simulator. Try on a device and I suspect it will work first time.
For future readers who find this and have a similar problem, the best way to diagnose the problem is to add this to your app delegate:
func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
print("Failed to register for remote notifications: \(error.localizedDescription)");
}

Answer 2

I recommend accomplishing this using a cloud code beforeSave trigger on the Installation class. It's incredibly simple and more robust than trying to handle it client-side. Here's all you need to get the job done:
// Make sure all installations point to the current user
Parse.Cloud.beforeSave(Parse.Installation, function(request, response) {
Parse.Cloud.useMasterKey();
if (request.user) {
request.object.set('user', request.user);
} else {
request.object.unset('user');
}
response.success();
});