ios - addSubview not showing view -

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i'm trying add uitextview cell following code: 

func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {      let cell = collectionview.dequeuereusablecellwithreuseidentifier("message_cell" , forindexpath: indexpath) as! displaymessagecollectionviewcell      let messagetextview: uitextview = {         let textview = uitextview()         textview.font = uifont.systemfontofsize(18)         textview.text = chat_m[indexpath.row].text         textview.backgroundcolor = uicolor.clearcolor()         return textview     }()     cell.addsubview(messagetextview)     cell.backgroundcolor = uicolor.lightgraycolor()      return cell

the problem is not visible on screen. have added using storyboard, problem occurred : uitextview in collectionview wrapping


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