ios - Set title of UIButton that's located in a UICell -

i don't understand why can't set title of uibutton. crashes here:

func tableview(tableview: uitableview, viewforheaderinsection section: int) -> uiview? {     if(section == 0) {         let view = uiview()         view.alpha = 0         return ktableheadershouldsticktotop ? view : carouselviewcontroller.view     } else {         let cell = tableview.dequeuereusablecellwithidentifier("newsfeedsectionheadercell") as! newsfeedsectionheadercell         cell.delegate = self         cell.datasource = self          cell.followingbutton.settitle("test", forstate: .normal)         return cell     } } 

it connected in .xib file:

please check whether can take cell object in viewforheaderinsection: method because per knowledge viewforheaderinsection: called before cellforrowatindexpath. put breakpoint @

let cell = tableview.dequeuereusablecellwithidentifier("newsfeedsectionheadercell") as! newsfeedsectionheadercell 

and check variable view (left console see logs) or hover on object see whether object nil or not. nil raising exception.