// Listener's class should conform to `PNEventsListener` protocol// in order to have access to available callbacks.// Adding listener. [pubnub addListener:self]; // Callbacks listed below. - (void)client:(PubNub *)pubnub didReceiveMessage:(PNMessageResult *)message{NSString *channel = message.data.channel; // Channel on which the message has been publishedNSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSNumber *timetoken = message.data.timetoken; // Publish timetokenid msg = message.data.message; // Message payloadNSString *publisher = message.data.publisher; // Message publisher } - (void)client:(PubNub *)pubnub didReceiveSignal:(PNSignalResult *)signal{NSString *channel = message.data.channel; // Channel on which the signal has been publishedNSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSNumber *timetoken = message.data.timetoken; // Signal timetokenid msg = message.data.message; // Signal payloadNSString *publisher = message.data.publisher; // Signal publisher } - (void)client:(PubNub *)pubnub didReceiveMessageAction:(PNMessageActionResult *)action{NSString *channel = action.data.channel; // Channel on which the message has been publishedNSString *subscription = action.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSString *event = action.data.event; // Can be: added or removedNSString *type = action.data.action.type; // Message action typeNSString *value = action.data.action.value; // Message action valueNSNumber *messageTimetoken = action.data.action.messageTimetoken; // Timetoken of the original messageNSNumber *actionTimetoken = action.data.action.actionTimetoken; // Timetoken of the message actionNSString *uuid = action.data.action.uuid; // UUID of user which added / removed message action } - (void)client:(PubNub *)pubnub didReceivePresenceEvent:(PNPresenceEventResult *)event{NSString *channel = message.data.channel; // Channel on which presence changesNSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSString *presenceEvent = event.data.presenceEvent; // Can be: join, leave, state-change, timeout or intervalNSNumber *occupancy = event.data.presence.occupancy; // Number of users subscribed to the channel (not available for state-change event)NSNumber *timetoken = event.data.presence.timetoken; // Presence change timetokenNSString *uuid = event.data.presence.uuid; // UUID of user for which presence change happened// Only for 'state-change' eventNSDictionary *state = event.data.presence.state; // User state (only for state-change event)// Only for 'interval' eventNSArray<NSString *> *join = event.data.presence.join; // UUID of users which recently joined channelNSArray<NSString *> *leave = event.data.presence.leave; // UUID of users which recently leaved channelNSArray<NSString *> *timeout = event.data.presence.timeout; // UUID of users which recently timed out on channel } - (void)client:(PubNub *)pubnub didReceiveObjectEvent:(PNObjectEventResult *)event{NSString *channel = event.data.channel; // Channel to which the event belongsNSString *subscription = event.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSString *event = event.data.event; // Can be: set or deleteNSString *type = event.data.type; // Entity type: channel, uuid or membershipNSNumber *timestamp = event.data.timestamp; // Event timestamp PNChannelMetadata *channelMetadata = event.data.channelMetadata; // Updated channel metadata (only for channel entity type) PNUUIDMetadata *uuidMetadata = event.data.uuidMetadata; // Updated channel metadata (only for uuid entity type) PNMembership *membership = event.data.membership; // Updated channel metadata (only for membership entity type) } - (void)client:(PubNub *)pubnub didReceiveFileEvent:(PNFileEventResult *)event{NSString *channel = event.data.channel; // Channel to which file has been uploadedNSString *subscription = event.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedid message = event.data.message; // Message added for uploaded fileNSString *publisher = event.data.publisher; // UUID of file uploaderNSURL *fileDownloadURL = event.data.file.downloadURL; // URL which can be used to download fileNSString *fileIdentifier = event.data.file.identifier; // Unique file identifierNSString *fileName = event.data.file.name; // Name with which file has been stored remotely } - (void)client:(PubNub *)pubnub didReceiveStatus:(PNStatus *)status{PNStatusCategory category = status.category; // One of PNStatusCategory fields to identify status of operation processing PNOperationType operation = status.operation; // One of PNOperationType fields to identify for which operation status receivedBOOL isError = status.isError; // Whether any kind of error happened.NSInteger statusCode = status.statusCode; // Related request processing status codeBOOL isTLSEnabled = status.isTLSEnabled; // Whether secured connection enabledNSString *uuid = status.uuid; // UUID which configured for passed clientNSString *authKey = status.authKey; // Auth key configured for passed clientNSString *origin = status.origin; // Origin against which request has been sentNSURLRequest *clientRequest = status.clientRequest; // Request which has been used to send last request (may be nil)BOOL willAutomaticallyRetry = status.willAutomaticallyRetry; // Whether client will try to perform automatic retry// Following is available when operation == PNSubscribeOperation,// because status is PNSubscribeStatus instance in this case PNSubscribeStatus *subscribeStatus = (PNSubscribeStatus *)status; NSNumber *currentTimetoken = subscribeStatus.currentTimetoken; // Timetoken which has been used for current subscribe requestNSNumber *lastTimeToken = subscribeStatus.lastTimeToken; // Timetoken which has been used for previous subscribe requestNSArray<NSString *> *subscribedChannels = subscribeStatus.subscribedChannels; // List of channels on which client currently subscribedNSArray<NSString *> *subscribedChannelGroups = subscribeStatus.subscribedChannelGroups; // List of channel groups on which client currently subscribedNSString *channel = subscribeStatus.data.channel; // Name of channel to which status has been receivedNSString *subscription = subscribeStatus.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribedNSNumber *timetoken = subscribeStatus.data.timetoken; // Timetoken at which event arrivedNSDictionary *userMetadata = subscribeStatus.data.userMetadata; // Metadata / envelope which has been passed along with event// Following is available when isError == YES,// because status is PNErrorStatus instance in this case PNErrorStatus *errorStatus = (PNErrorStatus *)status; id associatedObject = errorStatus.associatedObject; // Data which may contain related information (not decrypted message for example)NSArray<NSString *> *erroredChannels = errorStatus.errorData.channels; // List of channels for which error reported (mostly because of PAM)NSArray<NSString *> *erroredChannelGroups = errorStatus.errorData.channelGroups; // List of channel groups for which error reported (mostly because of PAM)NSString *errorInformation = errorStatus.errorData.information; // Stringified information about errorid errorData = errorStatus.errorData.data; // Additional error information from PubNub service }

[self.client publish:@{@ "msg": @"hello" } toChannel:targetChannel withCompletion:^(PNPublishStatus *publishStatus){if (!publishStatus.isError){// Message successfully published to specified channel. } else{/** * Handle message publish error. Check 'category' property to find out * possible reason because of which request did fail. * Review 'errorData' property (which has PNErrorData data type) of status * object to get additional information about issue. * * Request can be resent using: [publishStatus retry];*/ } }]; [self.client subscribeToChannels: @[@"hello-world-channel"] withPresence:YES];