swift3 - 如何自定义集合视图流程布局单元格

Question

我正在使用集合视图创建电影票应用程序。我被困在collectionView 中安排座位。如何自定义自定义流布局？我想要集合视图单元格的特定行中的特定数量的座位

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
  if collectionView == leftCollectionView {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "leftcellid", for: indexPath) as! LeftSideMovieCollectionViewCell
    let selectedseat = leftsideArray[indexPath.row]
    if selectedSeatArray.contains(selectedseat) {
      cell.leftMovieSeatImageView.image = UIImage.init(named: "seatfulled")
    } else {
      cell.leftMovieSeatImageView.image = UIImage.init(named: "seatblank")
    }
    if indexPath.row == 16 || indexPath.row == 17  ||  indexPath.row == 12 || indexPath.row == 13 {
      cell.leftMovieSeatImageView.isHidden = true
    } else {
      cell.leftMovieSeatImageView.isHidden = false
    }
    return cell
  } else if collectionView == RightCollectionview {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "rightcellid", for: indexPath) as! RightSideMovieCollectionViewCell
    let selectedseat = rightsideArray[indexPath.row]
    if selectedSeatArray.contains(selectedseat) {
      cell.RightMovieseatImageView.image = UIImage.init(named: "seatfulled")
    } else {
      cell.RightMovieseatImageView.image = UIImage.init(named: "seatblank")
    }
    if indexPath.row == 18 || indexPath.row == 19  ||  indexPath.row == 14 || indexPath.row == 15 {
      cell.RightMovieseatImageView.isHidden = true
    } else {
      cell.RightMovieseatImageView.isHidden = false
    }
    return cell
  } else {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "maincellid", for: indexPath) as! MainCollectionViewCell
    let selectedseat = vipSeatArray[indexPath.row]
    if selectedSeatArray.contains(selectedseat) {
      cell.mainSeatImageView.image = UIImage.init(named: "seatfulled")
    } else {
      cell.mainSeatImageView.image = UIImage.init(named: "seatblank")
    }
    if indexPath.row == 43 || indexPath.row == 42 ||  indexPath.row == 34 || indexPath.row == 33  {
      cell.mainSeatImageView.isHidden = true
    } else {
      cell.mainSeatImageView.isHidden = false
    }
    return cell
  }
}

在这里，我采取了三个集合视图。我已经隐藏了特定的单元格。我不知道如何修改这个。可以用一个集合视图来完成吗？任何建议将不胜感激。