Configuration API for PubNub Swift Native SDK

Migration guide

The PubNub Swift 3.0 SDK contains many significant changes from the 2.x SDK, including breaking changes. Please refer to the PubNub Swift 3.0 Migration Guide for more details.

A configuration object that defines behavior and policies for a PubNub instance.

Initializer(s)

Description

Creates a configuration using the specified PubNub Publish and Subscribe Keys:

Method(s)

To Initialize PubNub, you can use the following method(s) in the Swift SDK:

PubNubConfiguration(publishKey: String?, subscribeKey: String?)

Parameter	Type	Required	Default	Description
`publishKey`	String?	Optional	`nil`	Specifies the PubNub Publish Key to be used when publishing messages to a channel.
`subscribeKey`	String?	Yes	`nil`	Specifies the PubNub Subscribe Key to be used when subscribing to a channel.
`cipherKey`	Crypto?	Optional	`nil`	If set, all communication will be encrypted with this key.
`authKey`	String	Optional	`nil`	If Access Manager (Access Manager) is enabled, client will use authKey on all requests.
`userId`	String	Yes		`userId` to use. You should set a unique identifier for the user or the device that connects to PubNub. It's a UTF-8 encoded string of up to 64 alphanumeric characters. If you don't set the `userId`, you won't be able to connect to PubNub.
`useSecureConnections`	Bool	Optional	`true`	If `true`, requests will be made over HTTPS; otherwise they will use HTTP. You will still need to disable ATS for the system to allow insecure network traffic. See Apple's documentation for further details.
`origin`	String	Optional	`"ps.pndsn.com"`	Domain name used for requests.
`useInstanceId`	Bool	Optional	`false`	Whether a PubNub object instanceId should be included on outgoing requests.
`automaticRetry`	AutomaticRetry?	Optional	`nil`	Reconnection policy which will be used if/when a request fails.
`urlSessionConfiguration`	URLSessionConfiguration	Yes	`URLSessionConfiguration.pubnub`	`URLSessionConfiguration` used for `URLSession` network events.
`durationUntilTimeout`	Int	Optional	`300`	How long (in seconds) the server will consider the client alive for presence. Minimum value is `20`.
`heartbeatInterval`	UInt	Optional	`0`	How often (in seconds) the client will announce itself to server. Minimum value is 0.
`suppressLeaveEvents`	Bool	Optional	`false`	Whether to send out the leave requests.
`requestMessageCountThreshold`	UInt	Optional	`100`	The number of messages into the payload before emitting `RequestMessageCountExceeded`.
`filterExpression`	String?	Optional	`nil`	PSV2 feature to subscribe with a custom filter expression.
~~`uuid`~~	~~String~~	~~Yes~~		This parameter is deprecated, use `userId` instead. ~~UUID to use. You should set a unique UUID to identify the user or the device that connects to PubNub. If you don't set the `UUID`, you won't be able to connect to PubNub.~~

Basic Usage

Initialize the PubNub client API

Required `userId`

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

let config = PubNubConfiguration(
  publishKey: "demo",
  subscribeKey: "demo",
  userId: "myUniqueUserId"
)

let pubnub = PubNub(configuration: config)

Other Examples

Initialization for a Read-Only client

In the case where a client will only read messages and never publish to a channel, you can simply omit the publishKey when initializing the client:

Required `userId`

let config = PubNubConfiguration(
  subscribeKey: "demo",
  userId: "myUniqueUserId"
)
let pubnub = PubNub(configuration: config)

Event Listeners

Description

You can be notified of connectivity status, message, and presence notifications via the listeners.

Listeners should be added before calling the method.

Adding Listeners

// Create a new listener instance
let listener = SubscriptionListener()

// Add listener event callbacks
listener.didReceiveSubscription = { event in
  switch event {
  case let .messageReceived(message):
    print("Message Received: \(message) Publisher: \(message.publisher ?? "defaultUUID")")
  case let .connectionStatusChanged(status):
    print("Status Received: \(status)")
  case let .presenceChanged(presence):
    print("Presence Received: \(presence)")
  case let .subscribeError(error):
    print("Subscription Error \(error)")
  default:
show all 21 lines

How to check UUID

You can check the UUID of the publisher of a particular message by checking the message.publisher property in the subscription listener.

Removing Listeners

The SubscriptionListener can be removed by either calling listener.cancel(), or by letting it fall out of scope and be removed as an autoreleased object.

Listener Subscription Events

This is the list of SubscriptionEvent case types that can be emitted from didReceiveSubscription, or grouped together using didReceiveBatchSubscription. Each event case also has a standalone listener that can save code space, but will be functionally equivalent to using didReceiveSubscription.

SubscriptionEvent Case	Event Type	Standalone Listener	Event Description
messageReceived	`PubNubMessage`	`didReceiveMessage`	Messages sent to subscribed channels/groups
signalReceived	`PubNubMessage`	`didReceiveSignal`	Signals sent to subscribed channels/groups
connectionStatusChanged	`ConnectionStatus`	`didReceiveStatus`	Changes in the connection to the PubNub system
subscriptionChanged	`SubscriptionChangeEvent`	`didReceiveSubscriptionChange`	Notifies when channels/groups are subscribed or unsubscribed
presenceChanged	`PubNubPresenceChange`	`didReceivePresence`	Presence changes on subscribed channels/groups tracking presence
uuidMetadataSet	`PubNubUUIDMetadataChangeset`	`didReceiveObjectMetadataEvent`	UUID metadata was set
uuidMetadataRemoved	`String`	`didReceiveObjectMetadataEvent`	UUID metadata was removed
channelMetadataSet	`PubNubChannelMetadataChangeset`	`didReceiveObjectMetadataEvent`	Channel metadata was set
channelMetadataRemoved	`String`	`didReceiveObjectMetadataEvent`	Channel metadata was removed
membershipMetadataSet	`PubNubMembershipMetadata`	`didReceiveObjectMetadataEvent`	Membership metadata was set
membershipMetadataRemoved	`PubNubMembershipMetadata`	`didReceiveObjectMetadataEvent`	Membership metadata was removed
messageActionAdded	`PubNubMessageAction`	`didReceiveMessageAction`	A `PubNubMessageAction` was added to a published message
messageActionRemoved	`PubNubMessageAction`	`didReceiveMessageAction`	A `PubNubMessageAction` was removed from a published message
subscribeError	`PubNubError`	`subscribeError`	Any error that might have occurred during the subscription stream

Basic Usage

This is an example using didReceiveBatchSubscription, to allow you to receive multiple events per event call.

listener.didReceiveBatchSubscription = { events in
  for event in events {
    switch event {
    case .messageReceived(let message):
      print("The \(message.channel) channel received a message at \(message.published)")
      if let subscription = message.subscription {
        print("The channel-group or wildcard that matched this channel was \(subscription)")
      }
      print("The message is \(message.payload) and was sent by \(message.publisher ?? "")")
    case .signalReceived(let signal):
      print("The \(signal.channel) channel received a message at \(signal.published)")
      if let subscription = signal.subscription {
        print("The channel-group or wildcard that matched this channel was \(subscription)")
      }
      print("The signal is \(signal.payload) and was sent by \(signal.publisher ?? "")")
show all 79 lines

Other Examples

For didReceiveSubscription, simply rename the remove the for...in loop while keeping the event switch:

listener.didReceiveSubscription = { event in
  switch event {
  // Same content as the above example
  }
}

Overriding PubNub Configuration

All PubNubConfiguration properties are mutable, and can be changed after the object has been initialized. However, once the configuration is set on a PubNub instance those configurations are locked and can't be changed. Any changes would require a creating new PubNub instance.

userId

var config = pubnub.configuration
config.userId = "my_new_userId"

let pubnub = PubNub(configuration: config)

Authentication

var config = pubnub.configuration
config.authKey = "my_new_authkey"

let pubnub = PubNub(configuration: config)

Filter

You can override the subscribe filter expression without creating a new PubNub instance in one of two ways.

Equivalent functionality

These are functionally equivalent, and will take effect on the next subscription request and persist until changed.

In combination with a subscribe change:

pubnub.subscribe(to: ["new_subscription"], filterOverride: "(senderID=='my_new_userId')")

Without needing to make a subscription change:

pubnub.subscribeFilterExpression = "(senderID=='my_new_userId')"

Migration guide

Initializer(s)​

Description​

Method(s)​

Basic Usage​

Initialize the PubNub client API​

Required userId

Other Examples​

Initialization for a Read-Only client​

Required userId

Event Listeners​

Description​

Adding Listeners​

How to check UUID

Removing Listeners​

Listener Subscription Events​

Basic Usage​

Other Examples​

Overriding PubNub Configuration​

userId​

Authentication​

Filter​

Equivalent functionality

Initializer(s)

Description

Method(s)

Basic Usage

Initialize the PubNub client API

Required `userId`

Other Examples

Initialization for a Read-Only client

Required `userId`

Event Listeners

Description

Adding Listeners

Removing Listeners

Listener Subscription Events

Basic Usage

Other Examples

Overriding PubNub Configuration

userId

Authentication

Filter