swift - How would I limit the amount of items in a tableview and automatically load more? -

again real quick helped me out.

the last thing i'm dealing follows.

i have search functionality in application , looks through parse keyword , matches accordingly. works fine now, list gets bigger, i'm assuming load times might little much. instantly shows 200 text results , i'm wondering if it'll crash or lag when showing 2,000.

the following important parts of search class.

func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {     return searchresults.count }  func tableview(tableview: uitableview, heightforrowatindexpath indexpath: nsindexpath) -> cgfloat {     return uitableviewautomaticdimension }  func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {      let mycell = tableview.dequeuereusablecellwithidentifier("mycell", forindexpath: indexpath) as! uitableviewcell     //mycell.backgroundview = uiimageview(image: uiimage(named: "goodbg"))      //mycell.contentview.backgroundcolor =  uiimage(named: "nobg")     if mycell.backgroundview == nil {         mycell.backgroundview = uiimageview(frame: mycell.contentview.bounds)         mycell.backgroundview?.contentmode = uiviewcontentmode.scaletofill         mycell.backgroundview?.clipstobounds = true         mycell.contentview.backgroundcolor = uicolor.clearcolor()      }     //mycell.layoutmargins = uiedgeinsetszero     let backgroundimageview = mycell.backgroundview as! uiimageview     backgroundimageview.image = uiimage(named: "nobg")     mycell.textlabel?.text = searchresults[indexpath.row]     mycell.textlabel?.font = uifont(name: "lato-bold", size: 17)     mycell.textlabel?.textcolor = uicolor(red: 126.0/255, green: 126.0/255, blue: 126.0/255, alpha: 1)     mycell.textlabel?.linebreakmode = nslinebreakmode.bywordwrapping     mycell.textlabel?.numberoflines = 0     return mycell }   func searchbarsearchbuttonclicked(searchbar: uisearchbar) {      searchbar.resignfirstresponder()     var textsearchquery = pfquery(classname: "red")      textsearchquery.wherekey("text", containsstring: searchbar.text)       var query = pfquery.orquerywithsubqueries([textsearchquery])      query.findobjectsinbackgroundwithblock         {             (results: [anyobject]?, error: nserror?) -> void in              if error != nil             {                 //var myalert = uialertcontroller(title: "alert", message: error?.localizeddescription, preferredstyle: uialertcontrollerstyle.self)                 //let okaction = uialertaction(title: "ok", style: uialertactionstyle.default, handler: nil)                 //myalert.addaction(okaction)                 //self.presentviewcontroller(myalert, animated: true, completion: nil)                 return             }              if let objects = results as? [pfobject]             {                  self.searchresults.removeall(keepcapacity: false)                 object in objects                 {                     let searchtext = object.objectforkey("text") as! string                     self.searchresults.append(searchtext)                 }                  dispatch_async(dispatch_get_main_queue())                     {                         self.mytable.reloaddata()                         self.searchbar.resignfirstresponder()                 }             }     } } 

how make maybe 100 items loaded first , subsequent items loaded once user near bottom of page.

first, should able query in ranges. then, combine count of items in self.searchresults tableview(_: , willdisplaycell, forrowatindexpath:). is, row gets self.searchresults.count have cell show "loading ..." , meanwhile trigger query in next range.

roughly speaking, in willdisplaycell: check

if notalreadyfetching && self.searchresults.count == indexpath.row {     // fetch next range of 'searchresults' } 

and in cellforrowatindexpath: have last table cell kind of loader (until model gets updated , triggers callback):

if self.searchresults.count == indexpath.row {     // return loader cell }