Cocoa Message Persistence API Reference for Real-time Apps

Message Persistence gives you real-time access to the history of messages published to PubNub. Each message is timestamped to the nearest 10 nanoseconds and stored across multiple availability zones in several geographic locations. You can encrypt stored messages with AES-256 so they are not readable on PubNub’s network. For details, see Message Persistence.

You control how long messages are stored through your account’s retention policy. Options include: 1 day, 7 days, 30 days, 3 months, 6 months, 1 year, or Unlimited.

You can retrieve the following:

Messages
Message reactions
Files (using the File Sharing API)

History

Requires Message Persistence

Enable Message Persistence for your key in the Admin Portal. See how to enable add-on features.

This function fetches historical messages of a channel.

You can control how messages are returned and in what order:

Search for messages starting on the newest end of the timeline (default behavior - reverse = NO).
Search for messages from the oldest end of the timeline by setting reverse to YES.
Page through results by providing a start or end timetoken.
Retrieve a slice of the timeline by providing both a start and end timetoken.
Limit the number of messages using the limit parameter.

Start & End parameter usage clarity

If you specify only start (without end), you receive messages older than and up to that start timetoken. If you specify only end (without start), you receive messages that match that end timetoken and newer. If you specify both start and end, you receive messages between those timetokens (inclusive of end). You still receive up to 100 messages even if more match. Make iterative calls to history, adjusting start, to page through the full result set.

Method(s)

To run History you can use the following method(s) in the Cocoa SDK:

History with block

- (void)historyForChannel:(NSString *)channel
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with metadata and block

- (void)historyForChannel:(NSString *)channel
             withMetadata:(BOOL)shouldIncludeMetadata
               completion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`shouldIncludeMetadata` * Type: BOOL	Whether to include metadata in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with message reactions and block

- (void)historyForChannel:(NSString *)channel
       withMessageActions:(BOOL)shouldIncludeMessageActions
               completion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`shouldIncludeMessageActions` * Type: BOOL	Whether to include message actions in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with metadata, message reactions, and block

- (void)historyForChannel:(NSString *)channel
             withMetadata:(BOOL)shouldIncludeMetadata
           messageActions:(BOOL)shouldIncludeMessageActions
               completion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`shouldIncludeMetadata` * Type: BOOL	Whether to include metadata in the response.
`shouldIncludeMessageActions` * Type: BOOL	Whether to include message actions in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with dates and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with dates, metadata, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
          includeMetadata:(BOOL)shouldIncludeMetadata
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`shouldIncludeMetadata` * Type: BOOL	Whether to include metadata in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with dates, message reactions, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
    includeMessageActions:(BOOL)shouldIncludeMessageActions
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`shouldIncludeMessageActions` * Type: BOOL	Whether to include message actions in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with dates, metadata, message reactions, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
          includeMetadata:(BOOL)shouldIncludeMetadata
    includeMessageActions:(BOOL)shouldIncludeMessageActions
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`shouldIncludeMetadata` * Type: BOOL	Whether to include metadata in the response.
`shouldIncludeMessageActions` * Type: BOOL	Whether to include message actions in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block.

History with dates, limits, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
                    limit:(NSUInteger)limit
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`limit` * Type: NSUInteger	Maximum number of events to return (no more than 100).
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with dates, timetoken, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
         includeTimeToken:(BOOL)shouldIncludeTimeToken
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken delimiting the start of the time slice (exclusive).
`endDate` Type: NSNumber	Timetoken delimiting the end of the time slice (inclusive).
`shouldIncludeTimeToken` * Type: Bool	Whether to include message timestamps (timetokens) in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with dates, limits, timetoken, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
                    limit:(NSUInteger)limit
         includeTimeToken:(BOOL)shouldIncludeTimeToken
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken delimiting the start of the time slice (exclusive).
`endDate` Type: NSNumber	Timetoken delimiting the end of the time slice (inclusive).
`limit` * Type: NSUInteger	Number of historical messages to return (maximum 100).
`shouldIncludeTimeToken` * Type: Bool	Whether to include message timestamps (timetokens) in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with dates, limit, resersed order, and block

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
                    limit:(NSUInteger)limit
                  reverse:(BOOL)shouldReverseOrder
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken of the oldest event to include (exclusive).
`endDate` Type: NSNumber	Timetoken of the latest event to include (inclusive).
`limit` * Type: NSUInteger	Number of historical messages to return (maximum 100).
`shouldReverseOrder` * Type: Bool	Whether to traverse in reverse (oldest to newest). If both `startDate` and `endDate` are provided, reverse is ignored and messages are returned newest first.
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

History with dates, limits, timetoken, and block, in reverse order

- (void)historyForChannel:(NSString *)channel
                    start:(nullable NSNumber *)startDate
                      end:(nullable NSNumber *)endDate
                    limit:(NSUInteger)limit
                  reverse:(BOOL)shouldReverseOrder
         includeTimeToken:(BOOL)shouldIncludeTimeToken
           withCompletion:(PNHistoryCompletionBlock)block;

* required

Parameter	Description
`channel` * Type: NSString	`Channel` name to retrieve the History information.
`startDate` Type: NSNumber	Timetoken delimiting the start of the time slice (exclusive).
`endDate` Type: NSNumber	Timetoken delimiting the end of the time slice (inclusive).
`limit` * Type: NSUInteger	Number of historical messages to return (maximum 100).
`shouldReverseOrder` * Type: Bool	Whether to traverse in reverse (oldest to newest). If both `startDate` and `endDate` are provided, reverse is ignored and messages are returned newest first.
`shouldIncludeTimeToken` * Type: Bool	Whether to include message timestamps (timetokens) in the response.
`block` * Type: PNHistoryCompletionBlock	History completion block that delivers `result` and `status`.

Using the reverse parameter

Messages are always returned sorted in ascending time direction from history regardless of reverse. The reverse direction matters when you have more than 100 (or limit, if it's set) messages in the time interval, in which case reverse determines the end of the time interval from which it should start retrieving the messages.

Sample code

Retrieve the last 100 messages on a channel:

[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 {

        /**
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Response

The response object which is returned by the client when the history API is used:

@interface PNHistoryData : PNServiceData

// Channel history messages.
@property (nonatomic, readonly, strong) NSArray *messages;
// History time frame start time.
@property (nonatomic, readonly, strong) NSNumber *start;
// History time frame end time.
@property (nonatomic, readonly, strong) NSNumber *end;

@end

@interface PNHistoryResult : PNResult

// Stores reference on channel history request processing information.
@property (nonatomic, readonly, strong) PNHistoryData *data;
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Other examples

Use historyForChannel to retrieve the three oldest messages by retrieving from the time line in reverse

[self.client historyForChannel:@"my_channel" start:nil end:nil limit:3 reverse:YES
                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 {

        /**
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Response

[
    ["Pub1","Pub2","Pub3"],
    13406746729185766,
    13406746780720711
]

Use historyForChannel to retrieve messages newer than a given timetoken by paging from oldest message to newest message starting at a single point in time (exclusive)

[self.client historyForChannel:@"my_channel" start:@(13406746780720711) end:nil limit:100
                        reverse:YES 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 {

        /**
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Response

[
    ["Pub3","Pub4","Pub5"],
    13406746780720711,
    13406746845892666
]

Use historyForChannel to retrieve messages until a given timetoken by paging from newest message to oldest message until a specific end point in time (inclusive)

[self.client historyForChannel:@"my_channel" start:nil end:@(13406746780720711) limit:100
                includeTimeToken:NO 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 {

        /**
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Response

[
    ["Pub3","Pub4","Pub5"],
    13406746780720711,
    13406746845892666
]

History paging example

Usage

You can call the method by passing 0 or a valid timetoken as the argument.

// Pull out all messages newer than message sent at 14395051270438477.
[self historyFromStartDate:@(14395051270438477) onChannel:@"history_channel"
        withCompletionBlock:^(NSArray *messages) {

    NSLog(@"Messages from history: %@", messages);
}];

- (void)historyNewerThan:(NSNumber *)beginTime onChannel:(NSString *)channelName
        withCompletionBlock:(void (^)(NSArray *messages))block {

    NSMutableArray *msgs = [NSMutableArray new];
    [self historyFromStartDate:beginTime onChannel:channelName
                    withProgress:^(NSArray *objects) {

        [msgs addObjectsFromArray:objects];
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Fetch messages with metadata

[self.client historyForChannel:@"storage" withMetadata:YES
                    completion:^(PNHistoryResult *result, PNErrorStatus *status) {

    if (!status.isError) {
        /**
        * Fetched data available here:
        *   result.data.channels - dictionary with single key (name of requested channel) and
        *       list of dictionaries as value. Each entry will include two keys: "message" - for
        *       body and "metadata" for meta which has been added during message publish.
        */
    } else {
        /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
        *
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Fetch messages with actions

[self.client historyForChannel:@"chat" withMessageActions:YES
                    completion:^(PNHistoryResult *result, PNErrorStatus *status) {

    if (!status.isError) {
        /**
        * Fetched data available here:
        *   result.data.channels - dictionary with single key (name of requested channel) and
        *       list of dictionaries. Each entry will include two keys: "message" - for body and
        *       "actions" for list of added actions.
        */
    } else {
        /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
        *
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Fetch messages with metadata and actions

[self.client historyForChannel:@"chat" withMetadata:YES messageActions:YES
                    completion:^(PNHistoryResult *result, PNErrorStatus *status) {

    if (!status.isError) {
        /**
        * Fetched data available here:
        *   result.data.channels - dictionary with single key (name of requested channel) and
        *       list of dictionaries. Each entry will include three keys: "message" - for body,
        *       "metadata" for meta which has been added during message publish and "actions"
        *       for list of added actions.
        */
    } else {
        /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
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History (builder pattern)

This function fetches historical messages of a channel.

This method uses the builder pattern; you can omit any optional arguments.

Method(s)

To get channel history using the Builder pattern, use the following method(s) in the Cocoa SDK:

history()
    .channels(NSArray *)
    .start(NSNumber *)
    .end(NSNumber *)
    .limit(NSUInteger)
    .reverse(BOOL)
    .includeMetadata(BOOL)
    .shouldIncludeMessageType(BOOL)
    .shouldIncludeUUID(BOOL)
    .includeMessageActions(BOOL)
    .includeTimeToken(BOOL)
    .performWithCompletion(PNHistoryCompletionBlock);

* required

Parameter	Description
`channels` * Type: NSString	List of `channels` for which history should be returned.
`start` Type: NSNumber	Timetoken for oldest event starting from which next should be returned events. Value will be converted to required precision internally.
`end` Type: NSNumber	Timetoken for latest event till which events should be pulled out. Value will be converted to required precision internally.
`limit` Type: NSUInteger	Maximum number of messages which should be returned for each channel. Default and maximum value is 100 for a single channel, 25 for multiple channels, and 25 when `includeMessageActions` is `YES`.
`reverse` Type: BOOL	Setting to `YES` traverses the time line in reverse, starting with the oldest message first.
`includeMetadata` Type: BOOL	Whether event metadata should be included in response or not.
`shouldIncludeMessageType` Type: BOOL	Pass `YES` to receive the message type with each history message. Default is `YES`.
`shouldIncludeUUID` Type: BOOL	Pass `YES` to receive the publisher uuid with each history message. Default is `YES`.
`includeMessageActions` Type: BOOL	Whether event actions should be included in response or not. When `YES`, throws an exception if you call the method with more than one `channel`.
`includeTimeToken` Type: BOOL	Whether event dates (timetokens) should be included in response or not.
`block` * Type: PNHistoryCompletionBlock	History pull completion `block`.

Using the reverse parameter

Sample code

self.client.history()
    .channels(@[@"my_channel"])
    .limit(15)
    .performWithCompletion(^(PNHistoryResult *result, PNErrorStatus *status) {

    if (status == nil) {

        /**
         Handle downloaded history using:
         result.data.channels - dictionary with channels' history. Each key is channel name and value is
                                list of fetched messages.
         */
    }
    else {

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Response

Response objects which is returned by client when fetch messages Message Persistence API is used:

@interface PNHistoryData : PNServiceData

/**
 * Channel history messages.
 *
 * Set only for PNHistoryOperation operation and will be empty array for other operation types.
 */
@property (nonatomic, readonly, strong) NSArray *messages;

/**
 * Channels history.
 *
 * Each key represent name of channel for which messages has been received and values is list of
 * messages from channel's storage.
 *
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Error response which is used in case of Message Persistence API call failure:

@interface PNErrorData : PNServiceData

// Stringified error information.
@property (nonatomic, readonly, strong) NSString *information;

@end

@interface PNErrorStatus : PNStatus

// Whether status object represent error or not.
@property (nonatomic, readonly, assign, getter = isError) BOOL error;

// Additional information related to error status object.
@property (nonatomic, readonly, strong) PNErrorData *errorData;

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Other examples

Fetch messages with metadata

self.client.history()
    .channel(@"storage")
    .includeMetadata(YES)
    .performWithCompletion(^(PNHistoryResult *result, PNErrorStatus *status) {
        if (!status.isError) {
            /**
            * Fetched data available here:
            *   result.data.channels - dictionary with single key (name of requested channel) and
            *       list of dictionaries as value. Each entry will include two keys: "message" - for
            *       body and "metadata" for meta which has been added during message publish.
            */
        } else {
            /**
            * Handle message history download error. Check 'category' property to find out possible
            * issue because of which request did fail.
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Fetch messages with actions

self.client.history()
    .channel(@"chat")
    .includeMessageActions(YES)
    .performWithCompletion(^(PNHistoryResult *result, PNErrorStatus *status) {
        if (!status.isError) {
            /**
            * Fetched data available here:
            *   result.data.channels - dictionary with single key (name of requested channel) and
            *       list of dictionaries. Each entry will include two keys: "message" - for body and
            *       "actions" for list of added actions.
            */
        } else {
            /**
            * Handle message history download error. Check 'category' property to find out possible
            * issue because of which request did fail.
show all 20 lines

Fetch messages with metadata and actions

self.client.history()
    .channel(@"chat")
    .includeMetadata(YES)
    .includeMessageActions(YES)
    .performWithCompletion(^(PNHistoryResult *result, PNErrorStatus *status) {
        if (!status.isError) {
            /**
            * Fetched data available here:
            *   result.data.channels - dictionary with single key (name of requested channel) and
            *       list of dictionaries. Each entry will include three keys: "message" - for body,
            *       "metadata" for meta which has been added during message publish and "actions"
            *       for list of added actions.
            */
        } else {
            /**
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Delete messages from history

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Removes the messages from the history of a specific channel.

Delete-From-History

There is a setting to accept delete from history requests for a key, which you must enable by checking the Enable Delete-From-History checkbox in the key settings for your key in the Admin Portal.

Requires Initialization with secret key.

Method(s)

To Delete Messages from History you can use the following method(s) in the Cocoa SDK.

- (void)deleteMessagesFromChannel:(NSString *)channel start:(nullable NSNumber *)startDate end:(nullable NSNumber *)endDate withCompletion:(nullable PNMessageDeleteCompletionBlock)block

Sample code

[self.client deleteMessagesFromChannel:@"channel" start:@15101397027611671 end:@15101397427611671
                        withCompletion:^(PNAcknowledgmentStatus *status) {

    if (!status.isError) {
        // Messages within specified time frame has been removed.
    } else {
       /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
        *
        * Request can be resent using: [status retry];
        */
    }
}];

Other examples

Delete specific message from history

To delete a specific message, pass the publish timetoken (received from a successful publish) in the End parameter and timetoken +/- 1 in the Start parameter. e.g. if 15526611838554310 is the publish timetoken, pass 15526611838554309 in Start and 15526611838554310 in End parameters respectively as shown in the following code snippet.

[self.client deleteMessagesFromChannel:@"channel" start:@15526611838554309 end:@15526611838554310
                        withCompletion:^(PNAcknowledgmentStatus *status) {

    if (!status.isError) {
        // Messages within specified time frame has been removed.
    } else {
        /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
        *
        * Request can be resent using: [status retry];
        */
    }
}];

Delete messages from history (builder pattern)

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Removes the messages from the history of a specific channel.

Delete-From-History

There is a setting to accept delete from history requests for a key, which you must enable by checking the Enable Delete-From-History checkbox in the key settings for your key in the Admin Portal.

Requires Initialization with secret key.

Method(s)

To Delete Messages from History you can use the following method(s) in the Cocoa SDK.

- deleteMessage()
    .channel(NSString *)
    .start(NSNumber *)
    .end(NSNumber *)
    .performWithCompletion(nullable PNAcknowledgmentStatus *);

Sample code

self.client.deleteMessage().channel(@"channel").start(@15101397027611671).end(@15101397427611671)
    .performWithCompletion(^(PNAcknowledgmentStatus *status) {

    if (!status.isError) {
        // Messages within specified time frame has been removed.
    } else {
       /**
        * Handle message history download error. Check 'category' property to find out possible
        * issue because of which request did fail.
        *
        * Request can be resent using: [status retry];
        */
    }
});

Message counts

Requires Message Persistence

This method requires that Message Persistence is enabled for your key in the Admin Portal.

Returns the number of messages published on one or more channels since a given time. The count returned is the number of messages in history with a timetoken value greater than or equal to than the passed value in the timetokensparameter.

Unlimited message retention

For keys with unlimited message retention enabled, this method considers only messages published in the last 30 days.

Method(s)

You can use the following method(s) in the Cocoa SDK:

messageCounts()
    .channels(NSArray<NSString *> *)
    .timetokens(NSArray<NSNumber *> *)
    .performWithCompletion(PNMessageCountCompletionBlock);

* required

Parameter	Description
`channels` * Type: NSArray`<NSString >` Default: n/a	The `channels` to fetch the message count
`timetokens` * Type: NSArray`<NSNumber >` Default: n/a	List with single or multiple timetokens, where each timetoken position in correspond to target `channel` location in channel names list.
`completion` * Type: PNMessageCountCompletionBlock Default: n/a	Messages count fetch completion closure which pass two arguments: `result` - in case of successful request processing data field will contain results of message count fetch operation; `status` - in case of error occurred during request processing.

Sample code

self.client.messageCounts().channels(@[@"unread-channel-1", @"unread-channel-2"])
    .timetokens(@[@(15501015683744028)])
    .performWithCompletion(^(PNMessageCountResult *result, PNErrorStatus *status) {

        if (!status.isError) {
            // Client state retrieved number of messages for channels.
        } else {
            /**
             Handle client state modification 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]
            */
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Returns

Channels count

Channels without messages have a count of 0. Channels with 10,000 messages or more have a count of 10000.

@interface PNMessageCountData : PNServiceData

/**
 * @brief Dictionary where each key is name of channel and value is number of messages in it.
 */
@property (nonatomic, readonly, strong) NSDictionary<NSString *, NSNumber *> *channels;

@end

@interface PNMessageCountResult : PNResult

/**
 * @brief Message count request processing information.
 */
@property (nonatomic, readonly, strong) PNMessageCountData *data;
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Other examples

Retrieve count of messages using different timetokens for each channel

self.client.messageCounts().channels(@[@"unread-channel-1", @"unread-channel-2"])
    .timetokens(@[@(15501015683744028), @(15501015683744130)])
    .performWithCompletion(^(PNMessageCountResult *result, PNErrorStatus *status) {

        if (!status.isError) {
            // Client state retrieved number of messages for channels.
        } else {
            /**
                Handle client state modification 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]
            */
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History​

Requires Message Persistence

Start & End parameter usage clarity

Method(s)​

History with block​

History with metadata and block​

History with message reactions and block​

History with metadata, message reactions, and block​

History with dates and block​

History with dates, metadata, and block​

History with dates, message reactions, and block​

History with dates, metadata, message reactions, and block​

History with dates, limits, and block​

History with dates, timetoken, and block​

History with dates, limits, timetoken, and block​

History with dates, limit, resersed order, and block​

History with dates, limits, timetoken, and block, in reverse order​

Using the reverse parameter

Sample code​

Response​

Other examples​

Use historyForChannel to retrieve the three oldest messages by retrieving from the time line in reverse​

Response​

Use historyForChannel to retrieve messages newer than a given timetoken by paging from oldest message to newest message starting at a single point in time (exclusive)​

Response​

Use historyForChannel to retrieve messages until a given timetoken by paging from newest message to oldest message until a specific end point in time (inclusive)​

Response​

History paging example​

Usage

Fetch messages with metadata​

Fetch messages with actions​

Fetch messages with metadata and actions​

History (builder pattern)​

Method(s)​

Using the reverse parameter

Sample code​

Response​

Other examples​

Fetch messages with metadata​

Fetch messages with actions​

Fetch messages with metadata and actions​

Delete messages from history​

Requires Message Persistence

Delete-From-History

Method(s)​

Sample code​

Other examples​

Delete specific message from history​

Delete messages from history (builder pattern)​

Requires Message Persistence

Delete-From-History

Method(s)​

Sample code​

Message counts​

Requires Message Persistence

Unlimited message retention

Method(s)​

Sample code​

Returns​

Channels count

Other examples​

Retrieve count of messages using different timetokens for each channel​

History

Method(s)

History with block

History with metadata and block

History with message reactions and block

History with metadata, message reactions, and block

History with dates and block

History with dates, metadata, and block

History with dates, message reactions, and block

History with dates, metadata, message reactions, and block

History with dates, limits, and block

History with dates, timetoken, and block

History with dates, limits, timetoken, and block

History with dates, limit, resersed order, and block

History with dates, limits, timetoken, and block, in reverse order

Sample code

Response

Other examples

Use historyForChannel to retrieve the three oldest messages by retrieving from the time line in reverse

Response

Use historyForChannel to retrieve messages newer than a given timetoken by paging from oldest message to newest message starting at a single point in time (exclusive)

Response

Use historyForChannel to retrieve messages until a given timetoken by paging from newest message to oldest message until a specific end point in time (inclusive)

Response

History paging example

Fetch messages with metadata

Fetch messages with actions

Fetch messages with metadata and actions

History (builder pattern)

Method(s)

Sample code

Response

Other examples

Fetch messages with metadata

Fetch messages with actions

Fetch messages with metadata and actions

Delete messages from history

Method(s)

Sample code

Other examples

Delete specific message from history

Delete messages from history (builder pattern)

Method(s)

Sample code

Message counts

Method(s)

Sample code

Returns

Other examples

Retrieve count of messages using different timetokens for each channel