ios - swift tableviewcell button image issue -

i have button in tableviewcell , when criteria met, want change button image. have endless scroll tableview.

for example, have 10 cells on first page. first cell meets criteria , button icon change displayed correctly. when scroll 11.the cells icon changed not meets criteria. when scroll down observe 21th, 31th... cells icons changed.

func setupx(){    let authorid = self.yazar?["author_id"].int!   let fetchrequest = nsfetchrequest(entityname: "favauthors")   let sortdescriptor = nssortdescriptor(key: "authorid", ascending: true)   fetchrequest.sortdescriptors = [sortdescriptor]   let predicate = nspredicate(format: "authorid == %ld", authorid!)   fetchrequest.predicate = predicate   let fetchresults = self.context!.executefetchrequest(fetchrequest, error:  nil) as? [favauthors]   if fetchresults!.count == 0 {   }else{      self.followbutton.setimage(uiimage(named: "unfollow button.pdf"), forstate: uicontrolstate.normal)   } }  

this because cells reused old state. should set image explicitly if not meet criteria.

for example, change:

if fetchresults!.count == 0 {   } else {      self.followbutton.setimage(uiimage(named: "unfollow button.pdf"), forstate: uicontrolstate.normal)   } 

to:

if fetchresults!.count == 0 {      self.followbutton.setimage(uiimage(named: "follow button.pdf"), forstate: uicontrolstate.normal)   } else {      self.followbutton.setimage(uiimage(named: "unfollow button.pdf"), forstate: uicontrolstate.normal)   }