Chat / iOS
Chat iOS v4
Chat iOS
This is the new Docs for Chat SDK v4 for iOS. To see the previous Docs, click here.

Receive messages in an open channel

The current user can receive messages sent by other participants through the channel(_:didReceive:) method in channel delegate. A BaseMessage object for each received message is one of the following message types.

Message typeDescription


A text message sent by a user.


A binary file message sent by a user.


A text message sent by an admin through the Chat API.

To register multiple concurrent handlers, pass a UNIQUE_DELEGATE_ID argument as a unique identifier into the SendbirdChat.add() method.

class OpenChannelChattingViewController: UIViewController, OpenChannelDelegate {
    func initViewController() {
        SendbirdChat.add(self, identifier: UNIQUE_DELEGATE_ID)

    func channel(_ sender: BaseChannel, didReceive message: BaseMessage) {
        // You can customize how to display the different types of messages
        // with the result object in the message parameter.
        if message is UserMessage {

        else if message is FileMessage {

        else if message is AdminMessage {


If the UI is no longer valid, remove the channel delegate using the following code.

SendbirdChat.removeChannelDelegate(forIdentifier: UNIQUE_DELEGATE_ID)

Event delegate for message threading

Once a reply is created or deleted from a thread, the channel(_:didUpdateThreadInfo:) event delegate method is invoked. The method returns a ThreadInfoUpdateEvent object that has the latest information about the thread. This object needs to be applied to the parent message object.

Note: Like other messages, when a reply is created in a channel, the channel(_:didReceive:) method of the channel event delegate in client apps will be called.

func channel(_ channel: BaseChannel, didUpdateThreadInfo threadInfoUpdateEvent: ThreadInfoUpdateEvent) {
    // Look for a message that has threadInfoUpdateEvent.targetMessageId
    // Apply the event to the message.

List of parameters

Parameter nameTypeDescription



Specifies the channel that has the message thread.



Specifies a ThreadInfoUpdateEvent object that has the latest information about the thread.