User list for pubnub-chat objective c - ios

Question

I have application where pubnub chat feature is been used.
I want to perform below feature
1)register / login user in pubnub programatically for chat
2)Get list of the all the users
3)Make friend and send 1st message to the user
I am aware about how to create the channel. I had created channel by below code :
PNConfiguration *configuration = [PNConfiguration configurationWithPublishKey:#"pub-c-XXXXXXXXXXXX-a2bf-XXXX-XXXX-XXXXXXXXXXXX"subscribeKey:#"sub-c-XXXXXXXXXXXX-02d0-XXXX-XXXX-XXXXXXXXXXXX"];
self.client = [PubNub clientWithConfiguration:configuration];
//[self.client addListener:self];
[self.client subscribeToChannels: #[#"my_channel"] withPresence:YES];
I get the channel architecture by : http://pubnub.github.io/pubnub-design-patterns/2015/03/05/Inbound-Channel-Pattern.html
But how do i get the list of the users and their channel and send the message.
I also found this : https://www.pubnub.com/docs/ios-objective-c/presence-sdk-v4
but this only show the friends status. whether they are online / offline by
Join
leave
timeout
Please advice and help
Code to find the list of the users are below but still is show the ZERO users:
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
PNConfiguration *configuration = [PNConfiguration configurationWithPublishKey:#"pub-c-XXXXXXXXXXXX-a2bf-XXXX-XXXX-XXXXXXXXXXXX"subscribeKey:#"sub-c-XXXXXXXXXXXX-02d0-XXXX-XXXX-XXXXXXXXXXXX"];
self.client = [PubNub clientWithConfiguration:configuration];
//Subscription process results arrive to listener which should adopt to PNObjectEventListener protocol and registered using:
[self.client addListener:self];
//Listeners callbacks:
[self.client subscribeToChannels: #[#"XXX"] withPresence:YES];
configuration.uuid = #"XXX";
[self.client hereNowForChannel:#"XXX" withVerbosity:PNHereNowState
completion:^(PNPresenceChannelHereNowResult *result,
PNErrorStatus *status) {
// Check whether request successfully completed or not.
if (!status.isError) {
NSLog(#"list of users %#", result.data.uuids);
NSLog(#"list of result.data.occupancy %#", result.data.occupancy);
// result.data.uuids - dictionary with active subscriber. Each entry will have next
// fields: "uuid" - identifier and "state" if it has been provided.
// result.data.occupancy - total number of active subscribers.
}
// Request processing failed.
else {
NSLog(#"FAIL");
// Handle presence audit error. Check 'category' property to find
// out possible issue because of which request did fail.
//
// Request can be resent using: [status retry];
}
}];
}

Answer 1

PubNub Here Now with State
You need to call hereNowForChannel with withVerbosity:PNHereNowState to get the user's state along with all the subscribed users.
The Objective-C SDK API Reference Docs for hereNowForChannel has more details.

Answer 2

Looking at the code, if you always set the UUID to #"XXX" you will only ever have 1 user. The Presence add-on for PubNub uses the UUID property to track active users on a channel, and if you only use 1 UUID PubNub will treat every client as the same client.
Here is our knowledge base article on setting the UUID
https://www.pubnub.com/knowledge-base/discussion/138/how-do-i-set-the-uuid
Also, the iOS PubNub SDK will create and reuse the UUID automatically. This is a new feature as of the 4.2 sdk.
https://www.pubnub.com/docs/ios-objective-c/api-reference-sdk-v4#uuid_example_2