ios - Laggy UITableViewController -

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i have uitableviewcontroller 1000 row. each cell contains label fill attributed string. cell self sizing cell , estimation not correct in estimatedheightforrowatindexpath did not use (i don't no why estimation cause lag, use nssting.boundingrectwithsize estimation). have uislider seekbar in bottom of view, when seek middle of page main thread become busy cellforrowatindexpath , not show waiting progress bar hud progress.

here cellforrowatindexpath:

func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {     let cell = tableview.dequeuereusablecellwithidentifier("aya cell") as! ayacell     let detail = api.readingdetail[indexpath.row % api.readingdetail.count]       cell.backgroundcolor = backgroundcolor      switch detail {     case .persian:          let text = translations.suras[self.sura.index-1].ayas[indexpath.row / api.readingdetail.count].text         var textbackground = uicolor.clearcolor()         if translations.suras[self.sura.index-1].ayas[indexpath.row / api.readingdetail.count].shouldselected == true {             textbackground = uicolor.yellowcolor()         }          let attributedtext = nsmutableattributedstring(string: text, attributes: [nsforegroundcolorattributename: persiantextcolor, nsfontattributename: ayapersianfont!, nsbackgroundcolorattributename: backgroundcolor])         attributedtext.appendattributedstring(nsattributedstring(string: " (\((indexpath.row / api.readingdetail.count+1).toarabicdigit()))", attributes: [nsforegroundcolorattributename: mojezeredcolor, nsfontattributename:uifont(name: "xnazanin", size: ayafont!.pointsize*0.65)!, nsparagraphstyleattributename: ayaparagraphstyle]))         cell.ayatextlabel.attributedtext = attributedtext      case .arabic:         let text = self.sura.ayas[indexpath.row / api.readingdetail.count].text          var textbackground = uicolor.clearcolor()         if self.sura.ayas[indexpath.row / api.readingdetail.count].shouldselected == true {             textbackground = uicolor.yellowcolor()         }          let attributedtext = nsmutableattributedstring(string: text, attributes: [nsforegroundcolorattributename: arabictextcolor, nsfontattributename: ayafont!, nsbackgroundcolorattributename: textbackground])         attributedtext.appendattributedstring(nsattributedstring(string: " ﴿\((indexpath.row / api.readingdetail.count+1).toarabicdigit())﴾", attributes: [nsforegroundcolorattributename: mojezeredcolor, nsfontattributename:uifont(name: "xnazanin", size: ayafont!.pointsize*0.65)!, nsparagraphstyleattributename: ayaparagraphstyle]))         cell.ayatextlabel.attributedtext = attributedtext      }      return cell }

is there solution this?


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