Presence channels support

Author: fbenevides

README.md

@@ -609,7 +609,7 @@ PusherChannel *myChannel = [pusher subscribeWithChannelName:@"my-channel"];
 
 This returns PusherChannel object, which events can be bound to.
 
-For non-presence channels, you can also provide a function that will be called when a client either subscribes or unsubscribes to a channel with the number of subscribers as a parameter. Also, this function is available as a parameter to `subscribe` function. 
+You can also provide a function that will be called when a client either subscribes or unsubscribes to a channel with the number of subscribers as a parameter. Also, this function is available as a parameter to `subscribe` function. 
 
 ```swift
 let onSubscriptionCountChanged = { (count: Int) in

Sources/Models/PusherChannels.swift

@@ -82,7 +82,8 @@ import Foundation
         connection: PusherConnection,
         auth: PusherAuth? = nil,
         onMemberAdded: ((PusherPresenceChannelMember) -> Void)? = nil,
-        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil
+        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil,
+        onSubscriptionCountChanged: ((Int) -> Void)? = nil
     ) -> PusherPresenceChannel {
         if let channel = self.channels[channelName] as? PusherPresenceChannel {
             return channel
@@ -92,7 +93,8 @@ import Foundation
                 connection: connection,
                 auth: auth,
                 onMemberAdded: onMemberAdded,
-                onMemberRemoved: onMemberRemoved
+                onMemberRemoved: onMemberRemoved,
+                onSubscriptionCountChanged: onSubscriptionCountChanged
             )
             self.channels[channelName] = newChannel
             return newChannel

Sources/Models/PusherPresenceChannel.swift

@@ -29,12 +29,13 @@ public typealias PusherUserInfoObject = [String: AnyObject]
         connection: PusherConnection,
         auth: PusherAuth? = nil,
         onMemberAdded: ((PusherPresenceChannelMember) -> Void)? = nil,
-        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil
+        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil,
+        onSubscriptionCountChanged: ((Int) -> Void)? = nil
     ) {
         self.members = []
         self.onMemberAdded = onMemberAdded
         self.onMemberRemoved = onMemberRemoved
-        super.init(name: name, connection: connection, auth: auth)
+        super.init(name: name, connection: connection, auth: auth, onSubscriptionCountChanged: onSubscriptionCountChanged)
     }
 
     /**

Sources/ObjC/Pusher+ObjectiveC.swift

@@ -22,18 +22,21 @@ import Foundation
         return self.subscribeToPresenceChannel(channelName: channelName,
                                                auth: nil,
                                                onMemberAdded: nil,
-                                               onMemberRemoved: nil)
+                                               onMemberRemoved: nil,
+                                               onSubscriptionCountChanged: nil)
     }
 
     func subscribeToPresenceChannel(
         channelName: String,
         onMemberAdded: ((PusherPresenceChannelMember) -> Void)? = nil,
-        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil
+        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil,
+        onSubscriptionCountChanged: ((Int) -> Void)? = nil
     ) -> PusherPresenceChannel {
         return self.subscribeToPresenceChannel(channelName: channelName,
                                                auth: nil,
                                                onMemberAdded: onMemberAdded,
-                                               onMemberRemoved: onMemberRemoved)
+                                               onMemberRemoved: onMemberRemoved,
+                                               onSubscriptionCountChanged: onSubscriptionCountChanged)
     }
 
     convenience init(withAppKey key: String, options: PusherClientOptions) {

Sources/PusherSwift.swift

@@ -89,13 +89,15 @@ let CLIENT_NAME = "pusher-websocket-swift"
         channelName: String,
         auth: PusherAuth? = nil,
         onMemberAdded: ((PusherPresenceChannelMember) -> Void)? = nil,
-        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil
+        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil,
+        onSubscriptionCountChanged: ((Int) -> Void)? = nil
     ) -> PusherPresenceChannel {
         return self.connection.subscribeToPresenceChannel(
             channelName: channelName,
             auth: auth,
             onMemberAdded: onMemberAdded,
-            onMemberRemoved: onMemberRemoved
+            onMemberRemoved: onMemberRemoved,
+            onSubscriptionCountChanged: onSubscriptionCountChanged
         )
     }
 

Sources/Services/PusherConnection.swift

@@ -143,14 +143,16 @@ import NWWebSocket
         channelName: String,
         auth: PusherAuth? = nil,
         onMemberAdded: ((PusherPresenceChannelMember) -> Void)? = nil,
-        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil
+        onMemberRemoved: ((PusherPresenceChannelMember) -> Void)? = nil,
+        onSubscriptionCountChanged: ((Int) -> Void)? = nil
     ) -> PusherPresenceChannel {
         let newChannel = channels.addPresence(
             channelName: channelName,
             connection: self,
             auth: auth,
             onMemberAdded: onMemberAdded,
-            onMemberRemoved: onMemberRemoved
+            onMemberRemoved: onMemberRemoved,
+            onSubscriptionCountChanged: onSubscriptionCountChanged
         )
 
         guard self.connectionState == .connected else { return newChannel }