1.判断是上拉还是下拉

    var isPullDown = true
        if refreshHeader.isRefreshing {
            isPullDown = true
        } else {
            isPullDown = false
        }

2.没有更多数据了

refreshFooter.endRefreshingWithNoMoreData()

取消显示没有更多数据了

refreshFooter.resetNoMoreData()

3.完整代码

    lazy var refreshHeader: MJRefreshNormalHeader = MJRefreshNormalHeader(refreshingTarget: self, refreshingAction: #selector(loadData))
    lazy var refreshFooter: MJRefreshAutoNormalFooter = MJRefreshAutoNormalFooter(refreshingTarget: self, refreshingAction: #selector(loadData))

  tableView.mj_header = self.refreshHeader
  tableView.mj_footer = self.refreshFooter

    var isPullDown = true
    var currentPage = 1
    var lastPage = 100
    var modelArr:[FDMomentModel] = []
    
    override func loadData(){
        printXY(#function, obj: self, line: #line)
        guard currentPage < lastPage || refreshHeader.isRefreshing == true else {
            refreshFooter.endRefreshingWithNoMoreData()
            return
        }
        if refreshHeader.isRefreshing == true {
            currentPage = 1
            isPullDown = true
            modelArr = []
            lastPage = 100
            refreshFooter.resetNoMoreData()
        }else{
            currentPage += 1
            isPullDown = false
        }
        getLikesMoment()
        
    }

  //获取精选动态
    func getLikesMoment(){
        weak var weakSelf = self
        SSNetworkManager.shared.getThemeData(type: .likes,page:currentPage) { (commonModel) in
            if weakSelf != nil{
                if weakSelf!.isPullDown {
                    weakSelf?.refreshHeader.endRefreshing()
                }else{
                    weakSelf?.refreshFooter.endRefreshing()
                }
            }
        
            if commonModel.error == nil{
                if commonModel.code == 0 {
                    let dict:NSDictionary = commonModel.data as! NSDictionary
                    let nsarr:NSArray = dict["data"] as! NSArray
                    if let modelArray = [FDMomentModel].deserialize(from: nsarr) {
                      let arr  = modelArray as! [FDMomentModel]
                        weakSelf?.modelArr += arr
                        weakSelf?.tableView.reloadData()
                    }
                    weakSelf?.lastPage = dict["last_page"] as! Int