swift - I'm getting in this program stack or it stops to work -


this program i'm beginner build succeeded running stop.

import uikit  class viewcontroller: uiviewcontroller,uitableviewdelegate,uitableviewdatasource {      var items = [string]()        @iboutlet var textfield: uitextfield!        @iboutlet weak var tableview: uitableview!      @ibaction func addbutton(sender: uibutton) {      let newitem = textfield.text             items.append(newitem!)      textfield.resignfirstresponder()      }      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.     }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }   func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {      return items.count  }  func tableview(tableview: uitableview, cellforrowatindexpath indexpath:     nsindexpath) -> uitableviewcell {          let cell = tableview.dequeuereusablecellwithidentifier("cell",forindexpath: indexpath)    cell.textlabel?.text = items[indexpath.row]   cell.textlabel?.textcolor = uicolor.redcolor()    return cell } }

the build succeeds, on running error in stack on flow showing 0 or nil can help?

i think missing tableview.reloaddata() after adding newitem datasource

try adding in ibaction this

@ibaction func addbutton(sender: uibutton) {    let newitem = textfield.text   items.append(newitem!)   tableview.reloaddata()   textfield.resignfirstresponder()  }

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