ios - UILabel connected to outlet, yet is nil -

i'm trying create screen has uiscrollview containing uiimageviewer, uiview, , uitableview. uitableview, have custom uitableviewcell has 2 uilabels in it. problem is, in uitableview's data source method, tableview(tableview, cellforrowatindexpath: indexpath)-> uitableviewcell, after dequeue itemtablecell, can't set text of uilabels of cell because they're nil, reason.

here's code viewdidload(), it's quite lengthy:

@iboutlet weak var descriptionlabel: uilabel! @iboutlet weak var scrollview: uiscrollview!  var itemselected: item! var tableview = uitableview() var imageviewer: uiimageview! var firstdetailview: uiview!  let detailcell = "itemdetailcell"  override func viewdidload() {     super.viewdidload()      descriptionlabel.text = itemselected.description.capitalizedstring      //setting delegates , data sources     scrollview.delegate = self     tableview.datasource = self     tableview.delegate = self      //registering cell class     tableview.registerclass(itemdetailcell.self, forcellreuseidentifier: detailcell)      //setting imageviewer     imageviewer = uiimageview(frame: cgrectmake(0, 0, view.frame.width, view.frame.height / 2.0))     imageviewer.image = itemselected.images[1]     imageviewer.contentmode = .scaleaspectfill     imageviewer.clipstobounds = true      //setting firstdetailview     firstdetailview = uiview(frame: cgrectmake(0.0, imageviewer.frame.height, view.frame.width, 50))     firstdetailview.layer.bordercolor = uicolor.graycolor().cgcolor     firstdetailview.layer.borderwidth = 0.5      //disabling autoresizing tableview, firstdetailview, , imageviewer     tableview.settranslatesautoresizingmaskintoconstraints(false)     firstdetailview.settranslatesautoresizingmaskintoconstraints(false)     imageviewer.settranslatesautoresizingmaskintoconstraints(false)      // setting itemlabel     var itemlabel = uilabel()     itemlabel.settranslatesautoresizingmaskintoconstraints(false)     itemlabel.font = uifont(name: "helveticaneue-light", size: 14.0) ?? uifont()     itemlabel.text = itemselected.title     firstdetailview.addsubview(itemlabel)      //setting pricelabel     var pricelabel = uilabel()     pricelabel.settranslatesautoresizingmaskintoconstraints(false)     pricelabel.font = uifont(name: "helvetica-bold", size: 14.0) ?? uifont()     pricelabel.text = "$" + string(format:"%.2f", itemselected.price)     pricelabel.textalignment = .right     firstdetailview.addsubview(pricelabel)      //adding horizontal constraints itemlabel , pricelabel     let views = dictionary(dictionaryliteral: ("itemlabel",itemlabel),("pricelabel",pricelabel))     let hconstraint = nslayoutconstraint.constraintswithvisualformat("h:|-8-[itemlabel]-[pricelabel]-8-|", options: nil, metrics: nil, views: views)     firstdetailview.addconstraints(hconstraint)      //adding vertical constrains itemlabel , pricelabel     let itemvcontraints = nslayoutconstraint.constraintswithvisualformat("v:|[itemlabel]|", options: nil, metrics: nil, views: views)     firstdetailview.addconstraints(itemvcontraints)     let pricevconstraints = nslayoutconstraint.constraintswithvisualformat("v:|[pricelabel]|", options: nil, metrics: nil, views: views)     firstdetailview.addconstraints(pricevconstraints)      //adding subviews scrollview     scrollview.addsubview(imageviewer)     scrollview.addsubview(firstdetailview)     scrollview.addsubview(tableview)      //master views dictionary     let masterviews = dictionary(dictionaryliteral: ("tableview",tableview),("firstdetailview",firstdetailview),("imageviewer",imageviewer),("scrollview",scrollview))      //setting horizontal , vertical constrains imageviewer, firstdetailview, , tableview     let htblconstraints = nslayoutconstraint.constraintswithvisualformat("h:|[tableview(==scrollview)]|", options: nil, metrics: nil, views: masterviews)     let himgconstrains = nslayoutconstraint.constraintswithvisualformat("h:|[imageviewer(==scrollview)]|", options: nil, metrics: nil, views: masterviews)     let hfrstdtlconstraints = nslayoutconstraint.constraintswithvisualformat("h:|[firstdetailview(==scrollview)]|", options: nil, metrics: nil, views: masterviews)     let vconstraints = nslayoutconstraint.constraintswithvisualformat("v:|[imageviewer(==300)]-0-[firstdetailview(==50)]-0-[tableview(==400)]|", options: nil, metrics: nil, views: masterviews)      //adding constraints scrollview     scrollview.addconstraints(htblconstraints)     scrollview.addconstraints(himgconstrains)     scrollview.addconstraints(hfrstdtlconstraints)     scrollview.addconstraints(vconstraints)  } 

here's code uitableview data source , delegate methods:

// mark: - table view delegate methods  func tableview(tableview: uitableview, heightforrowatindexpath indexpath: nsindexpath) -> cgfloat {     return cgfloat(50) }  // mark: - table view data source methods  func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {     return 4 }  func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {     let cell = tableview.dequeuereusablecellwithidentifier(detailcell) as! itemdetailcell      cell.detailtitle = "detail:"     cell.detail = "some detail."      return cell } 

now, problem is, code itemdetailcell:

class itemdetailcell: uitableviewcell {  @iboutlet weak var detailtitlelabel: uilabel! @iboutlet weak var detaillabel: uilabel!  var detailtitle: string {     {         return detailtitlelabel.text!     }     set(newtitle){         detailtitlelabel.text = newtitle     } }  var detail: string {     {         return detaillabel.text!     }     set(newdetail) {         detaillabel.text = newdetail     } }  override func awakefromnib() {     super.awakefromnib()     // initialization code }  override func setselected(selected: bool, animated: bool) {     super.setselected(selected, animated: animated)      // configure view selected state }  } 

when run code in simulator, fatal error: unexpectedly found nil while unwrapping optional value @ set(newtitle) detailtitle, stack trace shows both detailtitlelabel , detaillabel nil.

what problem?

i know did wrong. sorry such long question!

i need add along these lines:

let nib = uinib(nibname: "nameofnib", bundle: nil) tableview.registernib(nib, forcellreuseidentifier: celltableidentifier)