ios - Prepare for segue is autocalled -

i have view crontroller called "subcateory2", viewcontroller has uicollectionview wit custom cell. need 2 segues app. 1 of called "to_videostable" viewcontroller other view controller , other calles "reload_collection" cell same viewcontroller(because subcategory can have n-level of subcategories). problem prepareforsegue(i check in function identifier , defined in " func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath)",and execute different actions). when select cell should happen:

• first: go "func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath)", check condition , define identifier segue.

• second: go prepareforsegue, check condition , execute actions.

but happen:

• first: in ios simulator select cell.

• second: code go prepareforsegue , go segue called "reload_collection"(before going func collectionview(...)), , create white views. in moment 2 threads created, 1 of them go white windows , other next stop.

• third: "second theard" go func collectionview(...) , check condition, define identifier, call performseguewithidentifier , go prepareforsegue function. in prepareforsegue check identifier , execute differentes actions.

this code:

import uikit  class subcategory2: uiviewcontroller, uicollectionviewdelegate, uicollectionviewdatasource {      let viewutils = viewcontrollerutils()     var result_category: array<json> = []      @iboutlet weak var collectionview: uicollectionview!     var tit: string!     var url: string!     var end_url:string = "?page_size=100"     var  id_category: int!     var index: nsindexpath!     var url_children : string = ""     let imagepath = "http://d1rkb03u2ginv9.cloudfront.net/wp-content/uploads/"      override func viewdidload() {          self.viewutils.showactivityindicator(self.view)         super.viewdidload()         self.viewutils.showactivityindicator(self.view)         if self.result_category.isempty{             var category = category_function()             self.url = self.url + self.end_url             self.result_category = category.load_subcategory(self.url)}          self.viewutils.hideactivityindicator(self.view)      // additional setup after loading view. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath) {     var cell : uicollectionviewcell = collectionview.cellforitematindexpath(indexpath)!     println("entroooooooo")     if (self.result_category[indexpath.row]["children"].string != nil){         self.url_children = self.result_category[indexpath.row]["children"].string!         //while(self.url_children.isempty){}          println("voy reloadcollection")          performseguewithidentifier("reload_collection", sender: cell)         //performseguewithidentifier("reload_collection3", sender: self)     }else{          println("voy to_videostables")          performseguewithidentifier("to_videostable", sender: cell)         } }   func collectionview(collectionview: uicollectionview, numberofitemsinsection section: int) -> int {     //println(result_category.count)     return result_category.count }  func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) ->uicollectionviewcell {      let cell: collectionviewcellcontroller2 = collectionview.dequeuereusablecellwithreuseidentifier("cell2", forindexpath: indexpath) as! collectionviewcellcontroller2     println(self.result_category[indexpath.row]["slug"].stringvalue)     cell.label.text = self.result_category[indexpath.row]["slug"].stringvalue       if (self.result_category[indexpath.row]["images"]["file"].string != nil){         //println("+++++++++++++++++")         var image = self.result_category[indexpath.row]["images"]["file"].stringvalue         cell.image.sd_setimagewithurl(nsurl(string:self.imagepath + (image as! string)))      }else{         var image = "http://www.camping-oaza.com/images/joomlart/demo/default.jpg"         cell.image.sd_setimagewithurl(nsurl(string: image))         //cell.image.image = uiimage(named: image)     }      cell.numbervideoslabel.text = self.result_category[indexpath.row]["videos_count"].stringvalue     cell.numbersubcategorylabel.text = self.result_category[indexpath.row]["children_count"].stringvalue      return cell }  override func prepareforsegue(segue: uistoryboardsegue, sender: anyobject?) {      if segue.identifier == "to_videostable"{         println("-------------")         println("voy to_videostables")         let cell = sender as! uicollectionviewcell         let index = self.collectionview!.indexpathforcell(cell) // return -> nsindexpath?         //if (self.result_category[index!.row]["children"].string != nil){         //   self.loaddata(self.result_category[index!.row]["children"].string!)         //}else{         let vc : videosviewcontroller = segue.destinationviewcontroller as! videosviewcontroller          println(self.result_category[index!.row]["id"].intvalue)         vc.id_category =  self.result_category[index!.row]["id"].intvalue      }     if segue.identifier == "to_livevideos"{         println("-------------")         println("to_livevideos")         println("-------------------")         let vc : swrevealviewcontroller = segue.destinationviewcontroller as! swrevealviewcontroller     }     if segue.identifier == "reload_collection"{         println("-------------")         println("reload_collection")         println("-------------------")         var category = category_function()          let vc : subcategory2 = segue.destinationviewcontroller as! subcategory2           vc.url = self.url_children         println(category.load_subcategory(self.url_children + self.end_url))      }   } } 

with problem, created white windows , after created windows real information.

the order of println : - "reload_collection" - "entroooooooo" - "voy reloadcollection" or "voy to_videostables"

in pictures show main.stoyboard , windwos can see in app.

updated answer

you have situation want decide segue take when cell selected. have wired 1 of segues directly cell, means storyboard create segue you. calling performseguewithidentifier creates segue. need implement shouldperformseguewithidentifier cancel "reload_collection" segue when want segue "to_videostables".

in original answer below, suggested wire both segues viewcontroller, won't work because 1 of segues same viewcontroller.

so, way to:

1. modify didselectitematindexpath remove code handles "reload_collection" segue. storyboard making segue:

   func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath) {     var cell : uicollectionviewcell = collectionview.cellforitematindexpath(indexpath)!     println("entroooooooo")     if result_category[indexpath.row]["children"].string == nil {          println("voy to_videostables")          performseguewithidentifier("to_videostable", sender: cell)     } } 

2. wire segue "reload_collection" cell viewcontroller. allow storyboard perform segue you.

3. implement shouldperformseguewithidentifier tell storyboard when should make segue:

   override func shouldperformseguewithidentifier(identifier: string, sender: anyobject?) -> bool {      if segue.identifier == "reload_collection" {         let indexpath = collectionview.indexpathforcell(sender as! uicollectionviewcell)         return result_category[indexpath.row]["children"].string != nil     }     return true } 

4. in prepareforsegue need set url_children since no longer being done didselectitematindexpath:

   if segue.identifier == "reload_collection"{     println("-------------")     println("reload_collection")     println("-------------------")     var category = category_function()      let vc : subcategory2 = segue.destinationviewcontroller as! subcategory2      let indexpath = collectionview.indexpathforcell(sender as! uicollectionviewcell)     url_children = result_category[indexpath.row]["children"].string!     vc.url = url_children     println(category.load_subcategory(self.url_children + self.end_url)) } 

original answer

your segue getting auto-called because have wired cell. if want trigger performseguewithidentifier needs wired viewcontroller other segue. remove segue cell , rewire viewcontroller , give same identifier had when wired cell , should work.