swift - Tab bar not working when clicking second tab -

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i having problem tab bar controller! upon simulation of project, tab bar controller appears, first tab selected, , showing view have put in first tab (so correct). when click on second tab, takes me xcode , displays "thread 1: signal sigabrt" @ top of appdelegate class. have no idea why happening other maybe isnt linked correctly. can go on steps link view controller second tab of tab bar controller? thanks!

all have in storyboard of second scene 2 labels, switch, slider, , button. because need worry values of switch , label, 2 things have connected code using outlets.

1. tab bar controller 1 view controller

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2. add second view controller uilabel

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3. ctrl + drag tab bar controller second view controller

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4. choose relationship segue -> view controllers

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5. tab bar controller 2 view controllers

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6. result

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7. access labels etc., create file second view controller, in example secondviewcontroller.swift inherits uiviewcontroller

import uikit  class secondviewcontroller: uiviewcontroller {  }

8. in storyboard second view controller selected, set custom class in identity inspector , hit return

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9. connect ui element file , access it, ctrl + drag e.g. uilabel file , give name, in case randomtextlabel

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10. change label in secondviewcontroller.swift e.g. in viewdidload

import uikit  class secondviewcontroller: uiviewcontroller {    @iboutlet weak var randomtextlabel: uilabel!    override func viewdidload() {     super.viewdidload()     randomtextlabel.text = "changed label text"   } }

11. result changed uilabel

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