ios - how to set delegate while passing from one view controller to previous in swift 3? -

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here trying pass selected data table view previous view controller unable , code mentioned below , set delegate in case can me how resolve ?

protocol arraytopass: class {     func selectedarraytopass(selectedstrings: [string]) } class filterselectionviewcontroller: uiviewcontroller,uitableviewdatasource,uitableviewdelegate {  var values = [string]() var delegate: arraytopass?  override func viewdidload() {         super.viewdidload()         self.downloadjsonwithurl()         tabledetails.separatorinset = uiedgeinsets.zero         activityindicator.startanimating()         tabledetails.ishidden = true         tabledetails.datasource = self         tabledetails.delegate = self         let rightbarbutton = uibarbuttonitem(title: "apply", style: uibarbuttonitemstyle.plain, target: self, action: #selector(applybarbuttonactiontapped(_:)))         self.navigationitem.rightbarbuttonitem = rightbarbutton         tabledetails.estimatedrowheight = uitableviewautomaticdimension         tabledetails.rowheight = 60         // additional setup after loading view.     }     func applybarbuttonactiontapped(_ sender:uibarbuttonitem!){         let vc = filterselectionviewcontroller()         vc.delegate = self as! arraytopass         navigationcontroller?.popviewcontroller(animated: true)     }   func tableview(_ tableview: uitableview, didselectrowat indexpath: indexpath){         selected = false         if let cell = tableview.cellforrow(at: indexpath indexpath) {             if cell.accessorytype == .checkmark{                 cell.accessorytype = .none                 print("\(productname[indexpath.row])")                 values = values.filter{$0 != "\(productname[indexpath.row])"}                 selected = true             }             else{                 cell.accessorytype = .checkmark             }         }         if selected == true{             print(values)         }         else{             getalltextfromtableview()         }         self.delegate?.selectedarraytopass(selectedstrings: values)         print(values)     }     func getalltextfromtableview() {     guard let indexpaths = self.tabledetails.indexpathsforselectedrows else { // if no selected cells return     return     }      indexpath in indexpaths {         values.append(productname[indexpath.row])     }     }

in view controller trying data 

class filterviewcontroller: uiviewcontroller,uitableviewdatasource,uitableviewdelegate,arraytopass {   var values: [string] = []   func selectedarraytopass(selectedstrings: [string]){         values = selectedstrings     }

at time of redirection in filterselectionviewcontroller have set delegate = self this

let main = uistoryboard(name: "main", bundle: nil) let vc = main.instantiateviewcontroller(withidentifier: "tempvc") as! tempvc// filterselectionviewcontroller vc.delegatecolor = self //your delegate navigationcontroller?.pushviewcontroller(vc, animated: true)




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