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Change Scope of a Group Member

In order to change the scope of a group member, you can use the changeGroupMemberScope(). 
let guid = "GUID"
let uid = "UID";
let scope:CometChat.MemberScope = .admin

CometChat.updateGroupMemberScope(UID: uid, GUID: guid, scope: scope, onSuccess: { (response) in

 	print("Update group member scope changed successfully.")

}) { (error) in

  print("Update group member scope failed with error: " + error!.errorDescription);
}
This method takes the below parameters:
ParamterDescription
UIDThe uid of the member
GUIDThe guid of the group for which the member’s scope needs to be changed
scopeThe updated scope of the member. This can be either of the 3 values: 1. admin 2. moderator 3. participant
The default scope of any member is participant. Only the admin of the group can change the scope of any participant in the group

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Receive Real-Time Events

In other words, as a member of a group, how do I know when someone’s scope is changed when my app is running? In order to receive real-time events whenever a group member’s scope changes, you will need to override the onGroupMemberScopeChanged() method of the GroupListener class. You can receive live events related to ChangeMemberScope, In order to receive the Event, you must add protocol conformance CometChatGroupDelegate as shown below: 
extension AppDelegate: CometChatGroupDelegate {

  func onGroupMemberScopeChanged(action: ActionMessage, scopeChangeduser: User, scopeChangedBy: User, scopeChangedTo: String, scopeChangedFrom: String, group: Group) {

    print("\(scopeChangedUser.name) scope changed from \(scopeChangedFrom) to \(scopeChangedTo) by \(scopeChangedBy.name) in the group \(group.name).")
  }
}

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Missed Group Member Scope Changed Events

In other words, as a member of a group, how do I know when someone’s scope is changed when my app is not running? When you retrieve the list of previous messages if a member’s scope has been changed for any group that the logged-in user is a member of, the list of messages will contain an Action message. An Action message is a sub-class of BaseMessage class. For the group member scope changed event, in the Action object received, the following fields can help you get the relevant information-
  1. action - scopeChanged
  2. actionOn - User object containing the details of the user whos scope has been changed
  3. actionBy - User object containing the details of the user who changed the scope of the member
  4. actionFor - Group object containing the details of the group in which the member scope was changed
  5. oldScope - The original scope of the member
  6. newScope - The updated scope of the member