isMemberOnly property

Checks whether users cannot join a chat group freely:

• true: Yes. Needs the approval from the group owner(admin) or being invited by group members(PrivateOnlyOwnerInvite, PrivateMemberCanInvite, PublicJoinNeedApproval).
• false: No. Users can join freely ChatGroupStyle.PublicOpenJoin.

Note There are four types of group properties used to define the style of a group: ChatGroupStyle.

Return Whether users can join a chat group with only the approval of the group owner(admin):

• true: Yes. Needs the approval from the group owner(admin) or being invited by group members.
• false: No.