swift - App crashes when cell button is clicked -


i'm trying make app have vote / down vote system sorta reddit, means each cell in table had react differently when buttons clicked alter own data. create custom cell class , set accordingly, reason when run app crashes anytime hit buttons in cells.

here's code (i tried edit out unnecessary parts, let me know if you'd see whole thing):

import uikit import firebase import firebasedatabase  class findpartiesviewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource {      // store parties     var parties = [party]()      @iboutlet weak var partytable: uitableview!      var refreshcontrol = uirefreshcontrol()      override func viewdidload() {         super.viewdidload()          partytable.delegate = self         partytable.datasource = self            }        // creates number of cells in table     func tableview(_ tableview: uitableview, numberofrowsinsection section: int) -> int {          return parties.count          // define cells     func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell {          // make table cells show party         let cell = partytable.dequeuereusablecell(withidentifier: "cell", for: indexpath) as! customcell         cell.namelabel.text = parties[indexpath.row].name         cell.locationlabel.text = parties[indexpath.row].location         cell.totalvoteslabel.text = (string(parties[indexpath.row].upvotes - parties[indexpath.row].downvotes))         cell.upvotebutton.tag = indexpath.row        cell.upvotebutton.addtarget(self, action: selector(("upvoteaction")), for: .touchupinside)        cell.downvotebutton.tag = indexpath.row        cell.downvotebutton.addtarget(self, action: selector(("downvoteaction")), for: .touchupinside)            return cell     }      @ibaction func upvoteaction(sender: uibutton){         print("+1")        parties[sender.tag].upvotes = parties[sender.tag].upvotes + 1     }  }

(update) error message:

2016-11-10 13:35:20.371 lit[16625:2721786] -[lit.findpartiesviewcontroller upvoteaction]: unrecognized selector sent instance 0x7fc40b420240 2016-11-10 13:35:20.375 lit[16625:2721786] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[lit.findpartiesviewcontroller upvoteaction]: unrecognized selector sent instance 0x7fc40b420240' *** first throw call stack: (     0   corefoundation                      0x00000001093ef34b __exceptionpreprocess + 171     1   libobjc.a.dylib                     0x0000000108e5021e objc_exception_throw + 48     2   corefoundation                      0x000000010945ef34 -[nsobject(nsobject) doesnotrecognizeselector:] + 132     3   corefoundation                      0x0000000109374c15 ___forwarding___ + 1013     4   corefoundation                      0x0000000109374798 _cf_forwarding_prep_0 + 120     5   uikit                               0x0000000109814b88 -[uiapplication sendaction:to:from:forevent:] + 83     6   uikit                               0x000000010999a2b2 -[uicontrol sendaction:to:forevent:] + 67     7   uikit                               0x000000010999a5cb -[uicontrol _sendactionsforevents:withevent:] + 444     8   uikit                               0x00000001099994c7 -[uicontrol touchesended:withevent:] + 668     9   uikit                               0x0000000109d4b1dc _uigestureenvironmentsortandsenddelayedtouches + 5645     10  uikit                               0x0000000109d45ea3 _uigestureenvironmentupdate + 1472     11  uikit                               0x0000000109d4589b -[uigestureenvironment _deliverevent:togesturerecognizers:usingblock:] + 521     12  uikit                               0x0000000109d44a7e -[uigestureenvironment _updategesturesforevent:window:] + 286     13  uikit                               0x00000001098837ad -[uiwindow sendevent:] + 3989     14  uikit                               0x0000000109830a33 -[uiapplication sendevent:] + 371     15  uikit                               0x000000010a022b6d __dispatchpreprocessedeventfromeventqueue + 3248     16  uikit                               0x000000010a01b817 __handleeventqueue + 4879     17  corefoundation                      0x0000000109394311 __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 17     18  corefoundation                      0x000000010937959c __cfrunloopdosources0 + 556     19  corefoundation                      0x0000000109378a86 __cfrunlooprun + 918     20  corefoundation                      0x0000000109378494 cfrunlooprunspecific + 420     21  graphicsservices                    0x000000010cd78a6f gseventrunmodal + 161     22  uikit                               0x0000000109812f34 uiapplicationmain + 159     23  lit                                 0x0000000106fda27f main + 111     24  libdyld.dylib                       0x000000010ba3668d start + 1     25  ???                                 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)  

selector("upvoteaction")

and

func upvoteaction(sender: uibutton)

are not same, it's not finding method @ all. need add change former 

selector("upvoteaction:")

because actual method has parameter.

edit: per @rmaddy's comment, swift 3 way :

#selector(upvoteaction(sender:))

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