请问一下，iOS中，不同账号登陆同一个设备，获取消息列表时，还是上一个账号的消息列表，我哪里有问题吗？

NSArray *conversations = [[EaseMob sharedInstance].chatManager conversations];
    
    NSArray* sorte = [conversations sortedArrayUsingComparator:
                      ^(EMConversation *obj1, EMConversation* obj2){
                          EMMessage *message1 = [obj1 latestMessage];
                          EMMessage *message2 = [obj2 latestMessage];
                          if(message1.timestamp > message2.timestamp) {
                              return(NSComparisonResult)NSOrderedAscending;
                          }else {
                              return(NSComparisonResult)NSOrderedDescending;
                          }
                      }];