ios - Q:Value of type '[String]' has no member 'filtered' -

in code when implementation func :filtercontentforsearchtext(searchtext:string, scope:string)

error comes:

let resultpredicate:nspredicate = nspredicate.init(format: "name contains[c] \(searchtext)", searchtext) resultdatasource = datasource?.filtered(using: resultpredicate) nsarray?  // red error:value of type '[string]' has no member 'filtered' 

i post code below:

import uikit  class storelistviewcontroller: uiviewcontroller, uisearchbardelegate,uisearchdisplaydelegate,uitableviewdelegate,uitableviewdatasource {  var datasource:[string]? = nil var resultdatasource:nsarray? = nil  override func viewdidload() {     super.viewdidload()      initdata()     initui() }   /* // mark: - navigation  // in storyboard-based application, want little preparation before navigation override func prepare(for segue: uistoryboardsegue, sender: any?) {     // new view controller using segue.destinationviewcontroller.     // pass selected object new view controller. } */  // mark: - init func initdata(){      self.searchdisplaycontroller?.searchresultsdelegate = self     self.searchdisplaycontroller?.searchresultsdatasource = self     self.searchdisplaycontroller?.delegate = self      datasource = ["中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的","中青年年是当年是你的" ] } func initui() -> void {   }   // mark: - tableview delegate  func tableview(_ tableview: uitableview, numberofrowsinsection section: int) -> int {      if tableview == self.searchdisplaycontroller?.searchresultstableview {          return (datasource?.count)!     }else {          return (resultdatasource?.count)!     } }  func tableview(_ tableview: uitableview, heightforrowat indexpath: indexpath) -> cgfloat {     return 50 }  func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {      let cell_id = "storelisttabcell"      var cell:storelisttabcell = tableview.dequeuereusablecell(withidentifier: cell_id) as! storelisttabcell      // 配置cell     cell.title_label.text = datasource?[indexpath.row]      return cell }  func tableview(_ tableview: uitableview, didselectrowat indexpath: indexpath) {      tableview.deselectrow(at: indexpath, animated: true) }  // mark: - filter delegate func filtercontentforsearchtext(searchtext:string, scope:string) -> void {  //        nspredicate *resultpredicate = [nspredicate predicatewithformat:@"name contains[c] %@", searchtext]; //        filteredist = [oldlist filteredarrayusingpredicate:resultpredicate];     let resultpredicate:nspredicate = nspredicate.init(format: "name contains[c] \(searchtext)", searchtext)     resultdatasource = datasource?.filtered(using: resultpredicate) nsarray?  // there error!!! }  func searchdisplaycontroller(_ controller: uisearchdisplaycontroller, shouldreloadtableforsearch searchstring: string?) -> bool {      //let scope_str = searchdisplaycontroller?.searchbar.scopebuttontitles.objectatindex(self.searchdisplaycontroller.searchbar.selectedscopebuttonindex)     //[self filtercontentforsearchtext:searchstring scope:[[self.searchdisplaycontroller.searchbar scopebuttontitles] objectatindex:[self.searchdisplaycontroller.searchbar selectedscopebuttonindex]]];      var scopetitles:array = (searchdisplaycontroller?.searchbar.scopebuttontitles)!      let selected_index = searchdisplaycontroller?.searchbar.selectedscopebuttonindex      let scope_str = scopetitles[selected_index!]       filtercontentforsearchtext(searchtext: searchstring!, scope:scope_str)      return true }  } 

and in storyboard :

because swift array not support nsarray's filterred predicate, have use array.filter{ $0.contains(searchtext) } (recommended) or array.filter{resultpredicate.evaluate(with:$0)} (to use nspredicate - totally not cool swift) instead of 1 using

full:

array.filter { (item) -> bool in             resultpredicate.evaluate(with: item)         }