// 将用户添加到黑名单
V2TimValueCallback<List<V2TimFriendOperationResult>> addBlackList = await friendshipManager.addToBlackList(userIDList: ['user1']);


// 将用户从黑名单中移除
V2TimValueCallback<List<V2TimFriendOperationResult>> deleteBlackList = await friendshipManager.deleteFromBlackList(userIDList: ['user1']);

// 获取黑名单列表
V2TimValueCallback<List<V2TimFriendInfo>> blacklist = await friendshipManager.getBlackList();