xcode - UICollectionViewCell change background color for multiple cells -

i want change cell background color of selected cell anytime select cell changes background color of selected cell , random cell. wrong?

here code:

func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {     let cell = collectionview.dequeuereusablecellwithreuseidentifier("cell", forindexpath: indexpath) as! uicollectionviewcell     cell.contentview.backgroundcolor = uicolor.orangecolor()     return cell } func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath){     let cell = colorcollection.cellforitematindexpath(indexpath)     cell?.backgroundcolor = uicolor.blackcolor() } 

first thing, don't want set cell's background color , not content view's? think should this:

cell.backgroundcolor = uicolor.orangecolor() 

then can go setting color of selected background view this:

func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {     let cell = collectionview.dequeuereusablecellwithreuseidentifier("cell", forindexpath: indexpath) as! uicollectionviewcell     cell.backgroundcolor = uicolor.orangecolor()      let selectionview = uiview()     selectionview.backgroundcolor = uicolor.blackcolor()     cell.selectedbackgroundview = selectionview      return cell }