isMemberOnly property

~english 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 EMGroupStyle.PublicOpenJoin.

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

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. ~end

~chinese 从内存中获取群组类型：成员是否能自由加入，还是需要申请或者被邀请。

群组有四个类型属性，isMemberOnly是除了 EMGroupStyle.PublicOpenJoin 之外的三种属性，表示该群不是自由加入的群组。

Note 如需最新数据，需先从服务器获取： EMGroupManager.fetchGroupInfoFromServer。

Return

• true：进群需要群主邀请，群成员邀请，或者群主和管理员同意入群申请；
• false：意味着用户可以自由加入群，不需要申请和被邀请。 ~end