iOS 8 Enabled Device Not Receiving Push Notifications After Code Update

iOS 8 enabled device not receiving PUSH notifications after code update

The way to register for push notifications has been changed in iOS 8:
Below is the code for all versions till iOS 9:

if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)])
{
    [[UIApplication sharedApplication] registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];

}
else
{
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
     (UIUserNotificationTypeBadge | UIUserNotificationTypeSound | UIUserNotificationTypeAlert)];
}

In case you want to check whether push notifications are enabled or not use below code:

- (BOOL) pushNotificationOnOrOff
{
    if ([UIApplication instancesRespondToSelector:@selector(isRegisteredForRemoteNotifications)]) {
        return ([[UIApplication sharedApplication] isRegisteredForRemoteNotifications]);
    } else {
        UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
        return (types & UIRemoteNotificationTypeAlert);
    }
}

#ifdef __IPHONE_8_0
- (void)application:(UIApplication *)application   didRegisterUserNotificationSettings:   (UIUserNotificationSettings *)notificationSettings
{
    //register to receive notifications
    [application registerForRemoteNotifications];
}

- (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString   *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler
{
    //handle the actions
    if ([identifier isEqualToString:@"declineAction"]){
    }
    else if ([identifier isEqualToString:@"answerAction"]){
    }
}
#endif

Above code will run on Xcode 6+ only...

Why is app not getting registered for push notifications in iOS 8?

You need to call

[[UIApplication sharedApplication] registerForRemoteNotifications];

in your iOS8 code path, after registering the user notification settings.

Checking Push Notification Registration: isRegisteredForRemoteNotifications Not Updating

Because iOS 8 does register the device and provides a Token even if the user opts out from pushes.

In that case pushes are not presented to the user when the push is sent, but if your app is running it gets the payload so you can update it when the app is running...

To check if push notifications are enabled in iOS 8 you should check for the enabled user notification types:

- (BOOL)pushNotificationsEnabled {
    if ([[UIApplication sharedApplication] respondsToSelector:@selector(currentUserNotificationSettings)]) {
        UIUserNotificationType types = [[[UIApplication sharedApplication] currentUserNotificationSettings] types];
        return (types & UIUserNotificationTypeAlert);
    }
    else {
        UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
        return (types & UIRemoteNotificationTypeAlert);
    }
}

Some Devices Not Receiving Apple Push Notifications

The solution in the answer you linked to has a problem. It attemps to read the error response after each message is sent, but the read returns immediately and doesn't wait for a response to become available. While this is more efficient than waiting for a potential error response for X mili-seconds after each message, you might miss the error response and the connection may be dropped by Apple without you knowing any error occured.

While I can't give you code to solve your problem, I get give you some advice.

Here's the logic you should use (according to Apple), but I haven't managed to make it work reliably (at least not in my Java implementation):

Push Notification Throughput and Error Checking

If you're seeing throughput lower than 9,000 notifications per second, your server might benefit from improved error handling logic.

Here's how to check for errors when using the enhanced binary interface. Keep writing until a write fails. If the stream is ready for writing again, resend the notification and keep going. If the stream isn't ready for writing, see if the stream is available for reading.

If it is, read everything available from the stream. If you get zero bytes back, the connection was closed because of an error such as an invalid command byte or other parsing error. If you get six bytes back, that's an error response that you can check for the response code and the ID of the notification that caused the error. You'll need to send every notification following that one again.

Once everything has been sent, do one last check for an error response.

It can take a while for the dropped connection to make its way from APNs back to your server just because of normal latency. It's possible to send over 500 notifications before a write fails because of the connection being dropped. Around 1,700 notifications writes can fail just because the pipe is full, so just retry in that case once the stream is ready for writing again.

Now, here's where the tradeoffs get interesting. You can check for an error response after every write, and you'll catch the error right away. But this causes a huge increase in the time it takes to send a batch of notifications.

Device tokens should almost all be valid if you've captured them correctly and you're sending them to the correct environment. So it makes sense to optimize assuming failures will be rare. You'll get way better performance if you wait for write to fail or the batch to complete before checking for an error response, even counting the time to send the dropped notifications again.

None of this is really specific to APNs, it applies to most socket-level programming.

If your development tool of choice supports multiple threads or interprocess communication, you could have a thread or process waiting for an error response all the time and let the main sending thread or process know when it should give up and retry.

This is taken from Apple's Tech Note: Troubleshooting Push Notifications.

I don't know how you detect in PHP that the write failed, but when it does, you should attempt to write the failed notification once again, and if it fails again, try to read the error response and close the connection.

If you manage to read the error response, you will know which notification failed and you'll know the error type (the most likely error is 8 - invalid device token). The code in the answer you referred to doesn't do anything after identifying that error.
If after writing 100 messages you get an error response for the 80th message, you must resend messages 81 to 100, since Apple never received them. In my case (Java server), I don't always manage to read the error response (sometimes I get an error when trying to read the response from the socket). In that case I can only move on an send the next notifications (and have no way of knowing which notifications were actually received by Apple). That's why it's important to keep your database clean of invalid tokens.

If you keep your database clean (i.e. store in it only device tokens that were sent to your App by Apple, and all of them belong to the same push environment - either sandbox or production), you shouldn't encounter any invalid device tokens.

I encountered a similar problem to yours when implementing the push notification server side in Java. I couldn't reliably get all the error responses returned by Apple.

I found that in Java there's a way to disable the TCP Nagle's algorithm, which causes the buffering of multiple messages before sending them in a batch to Apple. Though Apple encourages us to use Nagle's algorithm (for performance reasons), I found that when I disable it and then try to read the response from Apple after each message I send to them, I manage to receive 100% of the error responses (I verified it by writing a process that simulated the APNS server).

By disabling Nagle's algorithm and sending the notifications one by one, slowly, and atempting to read the error response after each message, you can locate all the invalid tokens in your DB and remove them. Once you know your DB is clean you can enable Nagle's algorithm and resume sending notifications quickly without bothering to read the error responses from Apple. Then, whenever you get an error while writing a message to the socket, you can simply create a new socket and retry sending only the last message.

How to update code using enabledRemoteNotificationTypes because it is not supported in iOS 8 ?

You can also use this code:

if ([[UIApplication sharedApplication] respondsToSelector:@selector(currentUserNotificationSettings)]) {

    UIUserNotificationType types = [[[UIApplication sharedApplication] currentUserNotificationSettings] types];

    if (types == UIUserNotificationTypeNone) {
        // Do something
    }

} else {

    UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];

    if (types == UIRemoteNotificationTypeNone) {
        // Do something
    }
}

Or this one if you only want to check the user is registered for remote notifications:

if ([[UIApplication sharedApplication] respondsToSelector:@selector(isRegisteredForRemoteNotifications)]) {

    BOOL isRegisteredForRemoteNotifications = [[UIApplication sharedApplication] isRegisteredForRemoteNotifications];

    if (isRegisteredForRemoteNotifications) { 
        // Do something
    }

} else {

    UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];

    if (types == UIRemoteNotificationTypeNone) {
        // Do something
    }
}

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