iOS 获取群组成员列表 官网文档示例疑问.

/*!

 *  获取群组成员列表

 *

 *  @param aGroupId         群组ID

 *  @param aCursor          游标

 *  @param aPageSize        获取多少条

 *  @param pError           错误信息

 *

 *  @return    列表和游标

 */

- (EMCursorResult *)getGroupMemberListFromServerWithId:(NSString *)aGroupId

                                                cursor:(NSString *)aCursor

                                              pageSize:(NSInteger)aPageSize

                                                 error:(EMError **)pError;



/*!

 *  获取群组成员列表

 *

 *  @param aGroupId         群组ID

 *  @param aCursor          游标

 *  @param aPageSize        获取多少条

 *  @param aCompletionBlock 完成的回调

 */

- (void)getGroupMemberListFromServerWithId:(NSString *)aGroupId

                                    cursor:(NSString *)aCursor

                                  pageSize:(NSInteger)aPageSize

                                completion:(void (^)(EMCursorResult *aResult, EMError *aError))aCompletionBlock;



//调用                                 

EMError *error = nil;

EMGroup* group = [[EMClient sharedClient].groupManager getGroupMemberListFromServerWithId:@"groupId" cursor:@"cursor" pageSize:50 error:&error];

if (!error) {

    NSLog(@"获取成功");

}