ios - Segue to next view controller after successful sign up -

i've searched , searched , searched not found solution. sign works not segue next view controller. heres code:

import uikit import parse import bolts  class signupvc: uiviewcontroller, uiimagepickercontrollerdelegate, uinavigationcontrollerdelegate {  @iboutlet weak var profilepictureiv: uiimageview! @iboutlet weak var firstnametf: uitextfield! @iboutlet weak var lastnametf: uitextfield! @iboutlet weak var newusernametf: uitextfield! @iboutlet weak var newpasswordtf: uitextfield! @iboutlet weak var emailtf: uitextfield! @iboutlet weak var phonenumbertf: uitextfield!  @ibaction func setprofilepicture(sender: anyobject) {     let mypickercontroller = uiimagepickercontroller()     mypickercontroller.delegate = self     mypickercontroller.sourcetype = uiimagepickercontrollersourcetype.photolibrary     self.presentviewcontroller(mypickercontroller, animated: true, completion: nil) }  @ibaction func signupbutton(sender: anyobject) {     let spinner: uiactivityindicatorview = uiactivityindicatorview(frame: cgrectmake(0, 0, 150, 150)) uiactivityindicatorview      if firstnametf.text != "" &&  lastnametf.text != "" && newusernametf.text != "" && newpasswordtf.text != "" && emailtf.text != "" && phonenumbertf.text != "" {          let newuser = pfuser()          if let profilepictureimage = profilepictureiv?.image {             let profilepicture = uiimagejpegrepresentation(profilepictureimage, 1)!             let profilepictureimagefile = pffile(data: profilepicture)             newuser["profilepicture"] = profilepictureimagefile         }         newuser["firstname"] = firstnametf.text         newuser["lastname"] = lastnametf.text         newuser.username = newusernametf.text         newuser.password = newpasswordtf.text         newuser.email = emailtf.text         newuser["phonenumber"] = phonenumbertf.text          newuser.signupinbackgroundwithblock {             (succeeded: bool, error: nserror?) -> void in             if let error = error {                 spinner.startanimating()                 self.alert("opps", textmessage: (error.localizeddescription))             } else {                 spinner.startanimating()                 self.alert("congratualtion!", textmessage: "success, account has been created.")                 self.performseguewithidentifier("showmessages", sender: self)             }         }     } else {         alert("hmm...", textmessage: "if want account, please fill in blanks.")     } }  override func viewdidload() {     super.viewdidload()     // additional setup after loading view. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  override func viewwillappear(animated: bool) {     self.navigationcontroller!.navigationbar.hidden = false }  func imagepickercontroller(picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [string : anyobject]) {     profilepictureiv.image = info[uiimagepickercontrolleroriginalimage] as? uiimage     self.dismissviewcontrolleranimated(true, completion: nil) }  func alert(texttitle: string, textmessage: string) {     let alertcontroller = uialertcontroller(title: texttitle, message: textmessage, preferredstyle: .alert)     alertcontroller.addaction(uialertaction(title: "ok", style: .default, handler: nil))     self.presentviewcontroller(alertcontroller, animated: true, completion: nil) }   /* // mark: - navigation  // in storyboard-based application, want little preparation before navigation override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) { // new view controller using segue.destinationviewcontroller. // pass selected object new view controller. } */  } 

if play self.performseguewithidentifier("showmessages", sender: self) line anywhere else when run program , press signup button directly go in messages view controller without signup required.

as paulw11 said , try remove alert message :-

       if let error = error {             spinner.startanimating()             self.alert("opps", textmessage: (error.localizeddescription))         } else {             spinner.startanimating()             self.performseguewithidentifier("showmessages", sender: self)            } 

or can call handler in code.

          if let error = error {             spinner.startanimating()             self.alert("opps", textmessage: (error.localizeddescription))         } else {             spinner.startanimating()             var alert = uialertcontroller(title: "welcome", message: "login", preferredstyle: uialertcontrollerstyle.alert)             alert.addaction(uialertaction(title:"ok", style: .default, handler:  { action in self.performseguewithidentifier("showmessages", sender: self) }            }