ios - collection view cells not loading images correctly -

i'm developing ios application loads posts server uicollectionview. collection view cell includes uiimageview fixed bottom of cell.

whenever start application , collection view loads, images not load correctly last image, correct dimensions. cells being formatted same way.

i have tried multitude of solutions nothing far has worked.

what suspect happening images have not finished loading before being set uiimageview of each cell (except last 1 in case). doesn't seem possible though cells reloaded after getting successful response..

this code particular function (using alamofire)

func getallposts(){      let url =  "\(constants.baseurl)/posts/"     let parameters = ["user_id": "\(userprofile!.getid())"]      alamofire.request(.post, url, parameters: parameters, encoding: .json)         .validate(contenttype: ["application/json"])         .responsestring { response in             switch response.result {              case .success:                  var postsarray = array<[string: anyobject]>()                  {                      let json = try nsjsonserialization.jsonobjectwithdata(response.data!, options: nsjsonreadingoptions.mutablecontainers)                        post in json as! [anyobject] {                          postsarray.append(post as! [string: anyobject])                      }                      //invert array of posts latest load first!                      postsarray = postsarray.reverse()                  } catch {                  }                  //convert json post objects , reload view                  self.initialiseposts(postsarray)                  self.collectionview?.reloaddata()               case .failure(let error):                 print(error)             }     }   } 

all appreciated.

edit: below current constraints on uiimageview

edit 2: here code formatting cells

override func collectionview(collectionview: uicollectionview, cellforitematindexpath indexpath: nsindexpath) -> uicollectionviewcell {      // reference our postcell no image     let cell = collectionview.dequeuereusablecellwithreuseidentifier(reuseidentifiers[0], forindexpath: indexpath) as! postcell      guard let _: post? = posts[indexpath.row] else {         return cell     }      return configurepostcell(cell, post: posts[indexpath.row])! }  func configurepostcell(cell: uicollectionviewcell, post: post) -> postcell?{     if let cell = cell as? postcell {          cell.author.text = post.user_name         cell.date.text = formatter.stringfromdate(post.pub_date!)         cell.desc.text = post.desc           cell.layer.cornerradius = 5 //set corner radius here          cell.advertimage.image = post.advert?.advert_image           return cell     }      return nil } 

update: using @michael's advice have found cell images are loading correctly..

but cell height being mysteriously cropped 50px..

storyboard editor cell size

cell size @ run-time

this seems issue have not found solution yet.

update: 2 hours left on bounty have decided award @michael because answer helped me further investigation of issue, still ongoing.

firstly, use debug view hierarchy button check anomalies in table cells @ runtime.

then breakpoint on cell creation , inspect uiimage set cell , make sure size right. if assign image downloaded local variable can quicklook too, see if looks right.

then, if seems sensible, check auto-layout code robust.

check removing downloading of images situation. this:

1. remove setting of image @ all, set image background uicolor.red or , check layout nicely little more normal uiviews.
2. embed image in app bundle png , set instead of downloaded image. again, @ how renders.
3. try different sizes image in app bundle , check again (if relevant - maybe images same size anyway)

if looks good, know it's around download or layout of server images.