ios - XPC connection interrupted for Xcode 9 -


i newcomer xcode , swift. trying build tic-tac-toe app, when run it, nothing happens. screen black. in debugging area says: "xpc connection interrupted." tried restarting simulator , computer. same thing still happened. in case need it, here code:

// //  viewcontroller.swift //  tictactoe // //  created kaminski on 7/17/17. //  copyright © 2017 kaminski. rights reserved. //  import uikit  class viewcontroller: uiviewcontroller {   @iboutlet weak var webview: uiwebview!  @iboutlet weak var winner: uilabel!  //buttons @ibaction func buttonbr(_ sender: any) { } @iboutlet weak var buttonbr1: uibutton!  @ibaction func buttonbm(_ sender: any) { } @iboutlet weak var buttonbm1: uibutton!  @ibaction func buttonbl(_ sender: any) { } @iboutlet weak var buttonbl1: uibutton!  @ibaction func buttonmr(_ sender: any) { } @iboutlet weak var buttonmr1: uibutton!  @ibaction func buttonm(_ sender: any) { } @iboutlet weak var buttonm1: uibutton!  @ibaction func buttonml(_ sender: any) { } @iboutlet weak var buttonml1: uibutton!  @ibaction func buttontr(_ sender: any) { } @iboutlet weak var buttontr1: uibutton!  @ibaction func buttontm(_ sender: any) { } @iboutlet weak var buttontm1: uibutton!  @ibaction func buttontl(_ sender: any) { } @iboutlet weak var buttontl1: uibutton! //buttons  let x = "x"  let o = "o"  var gameover = false         //x , o buttons  @ibaction func obutton(_ sender: any) {     while gameover == false      {     if (sender anyobject).tag == 1   {         buttontl1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 2   {         buttontm1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 3   {         buttontr1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 4   {         buttonml1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 5   {         buttonm1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 6   {         buttonmr1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 7   {         buttonbl1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 8   {         buttonbm1.settitle("/(o)", for: uicontrolstate.normal)   }     else if (sender anyobject).tag == 9   {         buttonbr1.settitle("/(o)", for: uicontrolstate.normal)   } } }  @ibaction func xbutton(_ sender: any) {      while gameover == false      {     if (sender anyobject).tag == 1     {        buttontl1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 2     {         buttontm1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 3     {         buttontr1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 4     {         buttonml1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 5     {         buttonm1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 6     {         buttonmr1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 7     {         buttonbl1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 8     {         buttonbm1.settitle("/(x)", for: uicontrolstate.normal)     }     else if (sender anyobject).tag == 9     {         buttonbr1.settitle("/(x)", for: uicontrolstate.normal)     } } }   //x , o buttons      @ibaction func reset(_ sender: any) {     buttontl1.settitle(" ", for: uicontrolstate.normal)     buttontm1.settitle(" ", for: uicontrolstate.normal)     buttontr1.settitle(" ", for: uicontrolstate.normal)     buttonml1.settitle(" ", for: uicontrolstate.normal)     buttonm1.settitle(" ", for: uicontrolstate.normal)     buttonmr1.settitle(" ", for: uicontrolstate.normal)     buttonbl1.settitle(" ", for: uicontrolstate.normal)     buttonbm1.settitle(" ", for: uicontrolstate.normal)     buttonbr1.settitle(" ", for: uicontrolstate.normal)     winner.text = (" ") }     override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib.      while gameover == false     {     //winner x     if buttontl1.currenttitle == "x" && buttontm1.currenttitle == "x" && buttontr1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttonml1.currenttitle == "x" && buttonm1.currenttitle == "x" && buttonmr1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttonbl1.currenttitle == "x" && buttonbm1.currenttitle == "x" && buttonbr1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttontl1.currenttitle == "x" && buttonml1.currenttitle == "x" && buttonbl1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttontm1.currenttitle == "x" && buttonm1.currenttitle == "x" && buttonbm1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttontr1.currenttitle == "x" && buttonmr1.currenttitle == "x" && buttonbr1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttontl1.currenttitle == "x" && buttonm1.currenttitle == "x" && buttonbr1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     else if buttontr1.currenttitle == "x" && buttonm1.currenttitle == "x" && buttonbl1.currenttitle == "x"     {         winner.text = "player x wins!"         gameover = true     }     // winner x      // winner o     if buttontl1.currenttitle == "o" && buttontm1.currenttitle == "o" && buttontr1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttonml1.currenttitle == "o" && buttonm1.currenttitle == "o" && buttonmr1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttonbl1.currenttitle == "o" && buttonbm1.currenttitle == "o" && buttonbr1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttontl1.currenttitle == "o" && buttonml1.currenttitle == "o" && buttonbl1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttontm1.currenttitle == "o" && buttonm1.currenttitle == "o" && buttonbm1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttontr1.currenttitle == "o" && buttonmr1.currenttitle == "o" && buttonbr1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttontl1.currenttitle == "o" && buttonm1.currenttitle == "o" && buttonbr1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     else if buttontr1.currenttitle == "o" && buttonm1.currenttitle == "o" && buttonbl1.currenttitle == "o"     {         winner.text = "player o wins!"         gameover = true     }     // winner o   }      let url = nsurl(string: "http://www.sweetoothdesign.com/games-tic-tac-toe")!     let request = nsurlrequest(url: url url)     webview.loadrequest(request urlrequest) }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }

}

thanks


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