Searching from array in swift

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
       
        if string.isEmpty
        {
            search = String(search.characters.dropLast())
        }
        else
        {
            search=textField.text!+string
        }
        
        print(search)
        let predicate=NSPredicate(format: "SELF.itemTitle CONTAINS[cd] %@", search)
        filtered = (data as [itemClass] as NSArray).filtered(using: predicate) as! [itemClass]
    
        //let searchPredicate = NSPredicate(format: "itemTitle CONTAINS[cd] %@", textField.text!)
        
//        filtered = data.filter({ (text) -> Bool in
//            let tmp: NSString = (text as itemClass).itemTitle as NSString
//            let range = tmp.range(of: string, options: NSString.CompareOptions.caseInsensitive)
//            return range.location != NSNotFound
//        })
        
        if(filtered.count == 0){
            searchActive = false;
            self.tableViewitemsData.isHidden = true
            self.lblNoRecords.isHidden = false
        } else {
            searchActive = true
            self.tableViewitemsData.isHidden = false
            self.lblNoRecords.isHidden = true
        }
        
        self.tableViewitemsData.reloadData()
        return true
    }