PubNub Cocoa Objective-C SDK 5.1.0

Get Code: CocoaPods

CocoaPods is a dependency manager and this is by far the easiest and quickest way to get started with PubNub Cocoa SDK! (If you don't have pods installed yet you can check CocoaPods installation section for installation guide).

Be sure you are running CocoaPods 1.0.0 or above! You can install the latest cocoapods gem:

gem install cocoapods

If you've already installed you can upgrade to the latest CocoaPods gem using:

gem update cocoapods

Get Code: Git

Add the PubNub Cocoa SDK folder to your project.

Get Code: Framework

The PubNub framework project allows you to build standalone framework bundles which can be copied right into your application.

To build the framework as a standalone bundle and integrate into project, perform the following:

Clone the PubNub master repository

git clone git@github.com:pubnub/objective-c.git

Navigate to root of the cloned repository
Run the CocoaPods pod install command to pull out all required dependencies
```
`pod install`
```
Open the PubNub.xcworkspace from the PubNub repository in Xcode.
Select the Framework or Universal Framework target for target platform and hit Cmd+B to build the selected type of framework.
Navigate to the Framework directory and find the Products directory.
Drag&Drop PubNub.framework bundle from the Products directory to your application.
Select the Copy items if needed checkbox and click Finish.
Open your project's General tab and scroll to Embedded Binaries.
Click on + and select PubNub.framework file.

Note

If the PubNub target has been used, then the framework will be generated only for the selected platform (device or simulator.) If you try to use the framework to compile for another platform, it will crash during run-time! Using the PubNub-Universal build target (which can be used on both device and simulator) will help mitigate any sort of crash scenarios during development.

Now that these steps are complete, let's learn more about how to use the framework in your app.

Using the framework with your app

At this point, you should have the framework added to your application project, we'll need to make your project aware of the PubNub framework.

You need to import the PubNub headers in classes where it will be used.

#import <PubNub/PubNub.h>

Get Code: Carthage

To build the framework as a standalone bundle and integrate into project, perform the following:

Install latest Carthage (if required).
Create a Cartfile (any location can be used) or use existing file.
```
touch Cartfile
```
Add next line into a Cartfile which will allow to build framework bundles
```
github "pubnub/objective-c" ~> 4.1
```
Update and rebuild the project's dependencies (update command ensure what latest PubNub client code will be used to build framework). build can be used if frameworks has been built before and it will be much faster because git clone will be skipped.
```
carthage update
```
Command above will build framework for all configured platforms, but if only one required it can be called like this
```
carthage update --platform ios
```
Instead of ios can be used: mac, tvos or watchos
Navigate to the Carthage directory and find the Build directory.
Navigate to directory which represent your target platform. For example: iOS
Drag&Drop PubNub.framework bundle from the Products directory to your application.
Select the Copy items if needed checkbox and click Finish.
Open your project's General tab and scroll to Embedded Binaries.
Click on + and select PubNub.framework file.

Using the framework with your app

At this point, you should have the framework added to your application project, we'll need to make your project aware of the PubNub framework.

You need to import the PubNub headers in classes where it will be used.

#import <PubNub/PubNub.h>

Get Code: Source

https://github.com/pubnub/objective-c/

View Supported Platforms

Hello World

To include PubNub SDK in your project you need to use CocoaPods.

Install CocoaPods gem by following the procedure defined under How to Get It To add the PubNub SDK to your project with CocoaPods, there are four basic tasks to complete which are covered below:

Create new Xcode project.
Create Podfile in new Xcode project root folder
```
touch Podfile
```
The PubNub client can be added as module (only with a deployment target of OS X 10.9 and above):
```
source 'https://github.com/CocoaPods/Specs.git'
platform :osx, "10.9"
use_frameworks!

target 'application-target-name' do
    pod "PubNub", "~> 4.1"
end
```
If you have any other pods you'd like to include, or if you have other targets you'd to add (like a test target) add those entries to this Podfile as well. See the CocoaPods documentation for more information on Podfile configuration.
Install your pods by running pod install via the command line from the directory that contains your Podfile.

Note

After installing your Pods, you should only be working within the workspace generated by CocoaPods or specified by you in Podfile. Always open the newly generated workspace file, not the original project file!

To be able to use PubNub SDK within your application code you need to import it. Import PubNub SDK headers in implementation files for classes where you need to use it using this import statement:

#import <PubNub/PubNub.h>

Complete application delegate configuration

Add the PNObjectEventListener protocol to AppDelegate in implementation file to anonymous category:

Note

Always set the UUID to uniquely identify the user or device that connects to PubNub. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device. If you don't set the UUID, you won't be able to connect to PubNub.

#import <PubNub/PubNub.h>

@interface AppDelegate () <PNObjectEventListener>

// Stores reference on PubNub client to make sure what it won't be released.
@property (nonatomic, strong) PubNub *client;

@end

Note

// Initialize and configure PubNub client instance
PNConfiguration *configuration = [PNConfiguration configurationWithPublishKey:@"demo" subscribeKey:@"demo"];
configuration.uuid = @"myUniqueUUID";

self.client = [PubNub clientWithConfiguration:configuration];
[self.client addListener:self];

// Subscribe to demo channel with presence observation
[self.client subscribeToChannels: @[@"my_channel"] withPresence:YES];

// Handle new message from one of channels on which client has been subscribed.
- (void)client:(PubNub *)client didReceiveMessage:(PNMessageResult *)message {

    // Handle new message stored in message.data.message
    if (![message.data.channel isEqualToString:message.data.subscription]) {

        // Message has been received on channel group stored in message.data.subscription.
    }
    else {

        // Message has been received on channel stored in message.data.channel.
    }

    NSLog(@"Received message: %@ on channel %@ at %@", message.data.message[@"msg"],
        message.data.channel, message.data.timetoken);
}

// New presence event handling.
- (void)client:(PubNub *)client didReceivePresenceEvent:(PNPresenceEventResult *)event {

    if (![event.data.channel isEqualToString:event.data.subscription]) {

        // Presence event has been received on channel group stored in event.data.subscription.
    }
    else {

        // Presence event has been received on channel stored in event.data.channel.
    }

    if (![event.data.presenceEvent isEqualToString:@"state-change"]) {

        NSLog(@"%@ \"%@'ed\"\nat: %@ on %@ (Occupancy: %@)", event.data.presence.uuid,
            event.data.presenceEvent, event.data.presence.timetoken, event.data.channel,
            event.data.presence.occupancy);
    }
    else {

        NSLog(@"%@ changed state at: %@ on %@ to: %@", event.data.presence.uuid,
            event.data.presence.timetoken, event.data.channel, event.data.presence.state);
    }
}

// Handle subscription status change.
- (void)client:(PubNub *)client didReceiveStatus:(PNStatus *)status {

    if (status.operation == PNSubscribeOperation) {

        // Check whether received information about successful subscription or restore.
        if (status.category == PNConnectedCategory || status.category == PNReconnectedCategory) {

            // Status object for those categories can be casted to `PNSubscribeStatus` for use below.
            PNSubscribeStatus *subscribeStatus = (PNSubscribeStatus *)status;
            if (subscribeStatus.category == PNConnectedCategory) {

                // This is expected for a subscribe, this means there is no error or issue whatsoever.

                // Select last object from list of channels and send message to it.
                NSString *targetChannel = [client channels].lastObject;
                [self.client publish: @{ @"msg": @"hello" }
                    toChannel: targetChannel withCompletion:^(PNPublishStatus *publishStatus) {

                    // Check whether request successfully completed or not.
                    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];
                      */
                    }
                }];
            }
            else {

                /**
                 This usually occurs if subscribe temporarily fails but reconnects. This means there was
                 an error but there is no longer any issue.
                 */
            }
        }
        else if (status.category == PNUnexpectedDisconnectCategory) {

            /**
             This is usually an issue with the internet connection, this is an error, handle
             appropriately retry will be called automatically.
             */
        }
        // Looks like some kind of issues happened while client tried to subscribe or disconnected from
        // network.
        else {

            PNErrorStatus *errorStatus = (PNErrorStatus *)status;
            if (errorStatus.category == PNAccessDeniedCategory) {

                /**
                 This means that PAM does allow this client to subscribe to this channel and channel group
                 configuration. This is another explicit error.
                 */
            }
            else {

                /**
                 More errors can be directly specified by creating explicit cases for other error categories
                 of `PNStatusCategory` such as: `PNDecryptionErrorCategory`,
                 `PNMalformedFilterExpressionCategory`, `PNMalformedResponseCategory`, `PNTimeoutCategory`
                 or `PNNetworkIssuesCategory`
                 */
            }
        }
    }
}

Copy and paste examples

In addition to the Hello World sample code, we also provide some copy and paste snippets of common API functions:

Init

Instantiate a new Pubnub instance. Only the subscribeKey is mandatory. Also include publishKey if you intend to publish from this instance, and the secretKey if you wish to perform PAM administrative operations from this Cocoa instance.

Important

It is not a best practice to include the secret key in client-side code for security reasons.

When you init with secretKey, you get root permissions for the Access Manager. With this feature you don't have to grant access to your servers to access channel data. The servers get all access on all channels.

Note

PNConfiguration *configuration = [PNConfiguration configurationWithPublishKey:@"demo"
                                                                 subscribeKey:@"demo"];
configuration.uuid = @"myUniqueUUID";
self.client = [PubNub clientWithConfiguration:configuration];

Important

PubNub instance should be placed as a property in a long-life object (otherwise PubNub instance will be automatically removed as autoreleased object).

@property (nonatomic, strong) PubNub *client;

Listeners

Adding Listeners

Listener's class should conform to PNEventsListener protocol 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 published
    NSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSNumber *timetoken = message.data.timetoken; // Publish timetoken
    id msg = message.data.message; // Message payload
    NSString *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 published
    NSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSNumber *timetoken = message.data.timetoken; // Signal timetoken
    id msg = message.data.message; // Signal payload
    NSString *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 published
    NSString *subscription = action.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSString *event = action.data.event; // Can be: added or removed
    NSString *type = action.data.action.type; // Message action type
    NSString *value = action.data.action.value; // Message action value
    NSNumber *messageTimetoken = action.data.action.messageTimetoken; // Timetoken of the original message
    NSNumber *actionTimetoken = action.data.action.actionTimetoken; // Timetoken of the message action
    NSString *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 changes
    NSString *subscription = message.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSString *presenceEvent = event.data.presenceEvent; // Can be: join, leave, state-change, timeout or interval
    NSNumber *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 timetoken
    NSString *uuid = event.data.presence.uuid; // UUID of user for which presence change happened

    // Only for 'state-change' event
    NSDictionary *state = event.data.presence.state; // User state (only for state-change event)

    // Only for 'interval' event
    NSArray<NSString *> *join = event.data.presence.join; // UUID of users which recently joined channel
    NSArray<NSString *> *leave = event.data.presence.leave; // UUID of users which recently leaved channel
    NSArray<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 belongs
    NSString *subscription = event.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSString *event = event.data.event; // Can be: set or delete
    NSString *type = event.data.type; // Entity type: channel, uuid or membership
    NSNumber *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 uploaded
    NSString *subscription = event.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    id message = event.data.message; // Message added for uploaded file
    NSString *publisher = event.data.publisher; // UUID of file uploader
    NSURL *fileDownloadURL = event.data.file.downloadURL; // URL which can be used to download file
    NSString *fileIdentifier = event.data.file.identifier; // Unique file identifier
    NSString *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 received
    BOOL isError = status.isError; // Whether any kind of error happened.
    NSInteger statusCode = status.statusCode; // Related request processing status code
    BOOL isTLSEnabled = status.isTLSEnabled; // Whether secured connection enabled
    NSString *uuid = status.uuid; // UUID which configured for passed client
    NSString *authKey = status.authKey; // Auth key configured for passed client
    NSString *origin = status.origin; // Origin against which request has been sent
    NSURLRequest *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 information 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 request
    NSNumber *lastTimeToken = subscribeStatus.lastTimeToken; // Timetoken which has been used for previous subscribe request
    NSArray<NSString *> *subscribedChannels = subscribeStatus.subscribedChannels; // List of channels on which client currently subscribed
    NSArray<NSString *> *subscribedChannelGroups = subscribeStatus.subscribedChannelGroups; // List of channel groups on which client currently subscribed
    NSString *channel = subscribeStatus.data.channel; // Name of channel for which status has been received
    NSString *subscription = subscribeStatus.data.subscription; // Wild-card channel or channel on which PubNub client actually subscribed
    NSNumber *timetoken = subscribeStatus.data.timetoken; // Timetoken at which event arrived
    NSDictionary *userMetadata = subscribeStatus.data.userMetadata; // Metadata / envelope which has been passed along with event

    // Following information 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 error
    id errorData = errorStatus.errorData.data; // Additional error information from PubNub service
}

Removing Listeners

[pubnub removeListener:self]

Listener status events

Category	Description
`PNAcknowledgmentCategory`	Reported operation request acknowledgment status.
`PNAccessDeniedCategory`	PAM permission failure.
`PNTimeoutCategory`	Server didn't respond in time for reported operation request.
`PNNetworkIssuesCategory`	No connection to Internet.
`PNRequestMessageCountExceededCategory`	The SDK announces this error if `requestMessageCountThreshold` is set, and the number of messages received from PubNub (in-memory cache messages) exceeds the threshold.
`PNConnectedCategory`	The SDK subscribed to new channels / channel groups.
`PNReconnectedCategory`	The SDK was able to reconnect to PubNub.
`PNDisconnectedCategory`	The SDK unsubscribed from channels / channel groups.
`PNUnexpectedDisconnectCategory`	The SDK unexpectedly lost ability to receive live updated from PubNub.
`PNRequestURITooLongCategory`	Reported operation request URI too long (too many channels / channel groups).
`PNMalformedFilterExpressionCategory`	The SDK has been configured with malformed filtering expression.
`PNMalformedResponseCategory`	The SDK received unexpected PubNub service response.
`PNDecryptionErrorCategory`	The SDK unable to decrypt received message using configured `cipherKey`.
`PNTLSConnectionFailedCategory`	The SDK unable to establish secured connection.
`PNTLSUntrustedCertificateCategory`	The SDK unable to check certificates trust chain.

Time

Call timeWithCompletion to verify the client connectivity to the origin:

[self.client timeWithCompletion:^(PNTimeResult *result, PNErrorStatus *status) {

    if (!status) {

        // Handle downloaded server timetoken using: result.data.timetoken
    }
    else {

        /**
         Handle timetoken download 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: [status retry];
         */
    }
}];

Subscribe (listen on) a channel (it's async!):

/**
 Subscription results arrive to a listener which should implement the
 PNObjectEventListener protocol and be registered as follows:
 */
[self.client addListener:self];
[self.client subscribeToChannels: @[@"my_channel1", @"my_channel2"] withPresence:NO];

// Handle a new message from a subscribed channel
- (void)client:(PubNub *)client didReceiveMessage:(PNMessageResult *)message {
    // Reference to the channel group containing the chat the message was sent to
    NSString *subscription = message.data.subscription;
    NSLog(@"%@ sent message to '%@' at %@: %@", message.data.publisher, message.data.channel,
            message.data.timetoken, message.data.message);
}

// Handle a subscription status change
- (void)client:(PubNub *)client didReceiveStatus:(PNStatus *)status {

    if (status.operation == PNSubscribeOperation) {

        // Check to see if the message is about a successful subscription or restore
        if (status.category == PNConnectedCategory || status.category == PNReconnectedCategory) {

            // Status object for those categories can be cast to `PNSubscribeStatus` for use below.
            PNSubscribeStatus *subscribeStatus = (PNSubscribeStatus *)status;
            if (subscribeStatus.category == PNConnectedCategory) {

                // For a subscribe, this is expected, and means there are no errors or issues
            }
            else {

                // This usually occurs if there is a transient error. The subscribe fails but
                 // then reconnects, and there is no longer any issue.
            }
        }
        else if (status.category == PNUnexpectedDisconnectCategory) {

            // This is usually an issue with the internet connection.
            // This is an error: handle appropriately, and retry will be called automatically.
        }
        // An issue occurred while the client tried to subscribe,
        // or the client was disconnected from the network
        else {

            PNErrorStatus *errorStatus = (PNErrorStatus *)status;
            if (errorStatus.category == PNAccessDeniedCategory) {

                // PAM prohibited this client from subscribing to this channel and channel group.
                // This is another explicit error.
            }
            else {

                /**
                 You can directly specify more errors by creating explicit cases
                 for other categories of `PNStatusCategory` errors, such as:
                 - `PNDecryptionErrorCategory`
                 - `PNMalformedFilterExpressionCategory`
                 - `PNMalformedResponseCategory`
                 - `PNTimeoutCategory`
                 - `PNNetworkIssuesCategory`
                 */
            }
        }
    }
    else if (status.operation == PNUnsubscribeOperation) {

        if (status.category == PNDisconnectedCategory) {

            // This is the expected category for an unsubscribe.
            // There were no errors in unsubscribing from everything.
        }
    }
    else if (status.operation == PNHeartbeatOperation) {

        /**
         Heartbeat operations can have errors, so check first for an error.
         For more information on how to configure heartbeat notifications through the status
         PNObjectEventListener callback, refer to
         http://www.pubnub.com/docs/sdks/objective-c/api-reference/configuration#configuration_basic_usage
         */

        if (!status.isError) { /* Heartbeat operation was successful */ }
        else { /* There was an error with the heartbeat operation: handle it here */ }
    }
}

// Handle a new signal from a subscribed channel
- (void)client:(PubNub *)client didReceiveSignal:(PNSignalResult *)signal {
    NSLog(@"%@ sent signal to '%@' at %@: %@", message.data.publisher, message.data.channel,
          message.data.timetoken, message.data.message);
}

// Handle new object event from one of channels on which client has been subscribed.
- (void)client:(PubNub *)client didReceiveObjectEvent:(PNObjectEventResult *)event {
    NSLog(@"'%@' has been %@'ed at %@", event.data.type, event.data.event,
        event.data.timestamp);
}

Note

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

Publish

Publish a message to a channel:

[self.client publish: @{@"Dictionary": @[@"with",@"array",@"as", @"value"]}
           toChannel: @"pubnub" withCompletion:^(PNPublishStatus *status) {

    if (!status.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: [status retry];
         */
    }
}];

Here Now

Get occupancy of who's here now on the channel by UUID:

Note

Requires you to enable the Presence add-on for your key. Refer to the How do I enable add-on features for my keys? knowledge base article for details on enabling features.

// With PNHereNowUUID client will pull out list of unique identifiers and occupancy information.
[self.client hereNowForChannel: @"my_channel" withVerbosity:PNHereNowUUID
                    completion:^(PNPresenceChannelHereNowResult *result,
                                 PNErrorStatus *status) {

    // Check whether request successfully completed or not.
    if (!status) {

        /**
         Handle downloaded presence information using:
            result.data.uuids - list of uuids.
            result.data.occupancy - total number of active subscribers.
         */
    }
    else {

        /**
         Handle presence audit 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: [status retry];
         */
    }
}];

Presence

Subscribe to real-time Presence events, such as join, leave, and timeout, by UUID. Setting the presence attribute to a callback will subscribe to presents events on my_channel:

Note

Requires you to enable the Presence add-on for your key. Refer to the How do I enable add-on features for my keys? knowledge base article for details on enabling features.

/**
 Subscription process results arrive to listener which should adopt to
 PNObjectEventListener protocol and registered using:
 */
[self.client addListener:self];
[self.client subscribeToPresenceChannels:@[@"my_channel"]];

// New presence event handling.
- (void)client:(PubNub *)client didReceivePresenceEvent:(PNPresenceEventResult *)event {

    if (![event.data.channel isEqualToString:event.data.subscription]) {

        // Presence event has been received on channel group stored in event.data.subscription.
    }
    else {

        // Presence event has been received on channel stored in event.data.channel.
    }

    if (![event.data.presenceEvent isEqualToString:@"state-change"]) {

        NSLog(@"%@ \"%@'ed\"\nat: %@ on %@ (Occupancy: %@)", event.data.presence.uuid,
              event.data.presenceEvent, event.data.presence.timetoken, event.data.channel,
              event.data.presence.occupancy);
    }
    else {

        NSLog(@"%@ changed state at: %@ on %@ to: %@", event.data.presence.uuid,
              event.data.presence.timetoken, event.data.channel, event.data.presence.state);
    }
}

Note

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.

History

Retrieve published messages from archival storage:

Note

Requires that the Message Persistence add-on is enabled for your key. How do I enable add-on features for my keys? - see https://support.pubnub.com/hc/en-us/articles/360051974791-How-do-I-enable-add-on-features-for-my-keys-

[self.client historyForChannel: @"my_channel" start:nil end:nil limit:100
                withCompletion:^(PNHistoryResult *result, PNErrorStatus *status) {

    if (!status) {

        /**
         Handle downloaded history using:
            result.data.start - oldest message time stamp in response
            result.data.end - newest message time stamp in response
            result.data.messages - list of messages
         */
    }
    else {

        /**
         Handle message history download 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: [status retry];
         */
    }
}];

Unsubscribe

Stop subscribing (listening) to a channel.

/**
 Unsubscription process results arrive to listener which should adopt to
 PNObjectEventListener protocol and registered using:
 */
[self.client addListener:self];
[self.client unsubscribeFromChannels: @[@"my_channel1", @"my_channel2"] withPresence:NO];

// Handle subscription status change.
- (void)client:(PubNub *)client didReceiveStatus:(PNStatus *)status {

    if (status.operation == PNUnsubscribeOperation && status.category == PNDisconnectedCategory) {

        /**
         This is the expected category for an unsubscribe. This means there was no error in
         unsubscribing from everything.
         */
    }
}

Note

The response of the call is handled by adding a Listener. Please see the Listeners section for more details. Listeners should be added before calling the method.