After a chat message arrives, you can read its metadata, delete it, and control who can chat through host privileges.
Read message metadata
Every onChatNewMessageNotify callback receives a ZoomVideoSDKChatMessage. In addition to the sender and content shown in Core features, the message exposes the following fields.
chatMessage.messageID // String — unique ID; needed for delete operations
chatMessage.timeStamp // Int — milliseconds since epoch
chatMessage.isChatToAll // Bool — true for public messages, false for private
chatMessage.isSelfSend // Bool — true if the local user sent this message
chatMessage.receiverUser // ZoomVideoSDKUser? — the recipient for a private message; nil when isChatToAll is true
chatMessage.messageID; // NSString — unique ID; needed for delete operations
chatMessage.timeStamp; // long long — milliseconds since epoch
chatMessage.isChatToAll; // BOOL — true for public messages, false for private
chatMessage.isSelfSend; // BOOL — true if the local user sent this message
chatMessage.receiverUser; // ZoomVideoSDKUser — the recipient for a private message; nil when isChatToAll is true
Delete a chat message
A user can delete a message they sent; a host can delete any message in the session; and a compliance system can delete a message under a data-loss-prevention policy. Before exposing a delete UI for a given message, ask the SDK whether it's deletable in the current context.
guard let chatHelper = ZoomVideoSDK.shareInstance()?.getChatHelper() else { return }
let messageID = chatMessage.messageID
if chatHelper.canChatMessageBeDeleted(messageID) {
let result = chatHelper.deleteChatMessage(messageID)
if result != .Errors_Success {
// Surface the error to the user.
}
}
ZoomVideoSDKChatHelper *chatHelper = [[ZoomVideoSDK shareInstance] getChatHelper];
NSString *messageID = chatMessage.messageID;
if ([chatHelper canChatMessageBeDeleted:messageID]) {
ZoomVideoSDKError result = [chatHelper deleteChatMessage:messageID];
if (result != Errors_Success) {
// Surface the error to the user.
}
}
Listen for deletions
When any message is deleted, the SDK fires onChatMsgDeleteNotification on every user's device. Remove the message from your UI from this callback so it stays in sync regardless of who initiated the delete.
func onChatMsgDeleteNotification(_ helper: ZoomVideoSDKChatHelper?, messageID msgID: String?, deleteBy type: ZoomVideoSDKChatMsgDeleteBy) {
// Remove the message with id msgID from your UI.
// Optionally show "Message removed by {host|sender|compliance}" using type.
}
- (void)onChatMsgDeleteNotification:(ZoomVideoSDKChatHelper *)helper messageID:(NSString *)msgID deleteBy:(ZoomVideoSDKChatMsgDeleteBy)type {
// Remove the message with id msgID from your UI.
// Optionally show "Message removed by {host|sender|compliance}" using type.
}
Delete-initiator values
ZoomVideoSDKChatMsgDeleteBy tells you who deleted the message.
| Value | Meaning |
|---|---|
ZoomVideoSDKChatMsgDeleteBy_NONE | Initialization value, not used in a real callback. |
ZoomVideoSDKChatMsgDeleteBy_SELF | The message author deleted their own message. |
ZoomVideoSDKChatMsgDeleteBy_HOST | The session host deleted the message. |
ZoomVideoSDKChatMsgDeleteBy_DLP | A Data Loss Prevention (DLP) policy removed the message for violating compliance rules. |
Host control: chat privileges
The session host (or a session manager) can change what kind of chat participants are allowed using changeChatPrivilege. Privilege changes fire onChatPrivilegeChanged on every user's device. Use that callback to enable or disable your composer.
guard let chatHelper = ZoomVideoSDK.shareInstance()?.getChatHelper() else { return }
// Read the current privilege (any user).
let privilege = chatHelper.getChatPrivilege()
// Change the privilege (host or manager only).
let result = chatHelper.changeChatPrivilege(.Everyone_Publicly)
if result != .Errors_Success {
// Privilege change was rejected — most commonly because the local
// user isn't the host or manager.
}
ZoomVideoSDKChatHelper *chatHelper = [[ZoomVideoSDK shareInstance] getChatHelper];
// Read the current privilege (any user).
ZoomVideoSDKChatPrivilegeType privilege = [chatHelper getChatPrivilege];
// Change the privilege (host or manager only).
ZoomVideoSDKError result = [chatHelper changeChatPrivilege:ZoomVideoSDKChatPrivilege_Everyone_Publicly];
if (result != Errors_Success) {
// Privilege change was rejected — most commonly because the local
// user isn't the host or manager.
}
Privilege values
ZoomVideoSDKChatPrivilegeType controls what kinds of chat participants can send.
| Value | Effect |
|---|---|
ZoomVideoSDKChatPrivilege_Unknown | Uninitialized. Should not appear in a real session. |
ZoomVideoSDKChatPrivilege_Everyone_Publicly_And_Privately | Participants can send public and private chat. |
ZoomVideoSDKChatPrivilege_Everyone_Publicly | Participants can send public chat only. Private messaging is off. |
ZoomVideoSDKChatPrivilege_No_One | Chat is fully disabled for non-host participants. |
React to privilege changes
Handle onChatPrivilegeChanged and update your composer to match the new privilege.
func onChatPrivilegeChanged(_ helper: ZoomVideoSDKChatHelper?, privilege currentPrivilege: ZoomVideoSDKChatPrivilegeType) {
switch currentPrivilege {
case .No_One:
hideChatComposer()
case .Everyone_Publicly:
showComposerWithoutPrivateOption()
case .Everyone_Publicly_And_Privately:
showFullComposer()
default:
break
}
}
- (void)onChatPrivilegeChanged:(ZoomVideoSDKChatHelper *)helper privilege:(ZoomVideoSDKChatPrivilegeType)currentPrivilege {
switch (currentPrivilege) {
case ZoomVideoSDKChatPrivilege_No_One:
[self hideChatComposer];
break;
case ZoomVideoSDKChatPrivilege_Everyone_Publicly:
[self showComposerWithoutPrivateOption];
break;
case ZoomVideoSDKChatPrivilege_Everyone_Publicly_And_Privately:
[self showFullComposer];
break;
default:
break;
}
}
If you only need a boolean "is chat available right now" check rather than the specific privilege value, the isChatDisabled and isPrivateChatDisabled helpers on ZoomVideoSDKChatHelper are easier to read at the call site.