How to show two items in one row? with using uicollectionView - ios

Question

I followed this video for study Collection View (https://www.youtube.com/watch?v=jQ8EUsQZJ5g)
And I wrote code like this :
if ( CollectionViewFlowLayout == nil ){
let numberOfItemsForRow : CGFloat = 2
let UpDownSpace : CGFloat = 5
let LeftRightSpace : CGFloat = 5
//CollectionViewFlowLayout은 delgate 처럼 소재지를 수정하고 꾸밀 수 있는 것이다.
CollectionViewFlowLayout = UICollectionViewFlowLayout()
//이건 margin의 크기를 정해주는 것이다.
CollectionViewFlowLayout?.sectionInset = UIEdgeInsets.zero
//이건 화면을 수직으로 내릴 것이냐, 수평으로 스크롤 할것이냐를 정해준다.
CollectionViewFlowLayout?.scrollDirection = .vertical
//소재지의 위 아래의 간격을 정해준다.
CollectionViewFlowLayout?.minimumLineSpacing = UpDownSpace
//같은 줄에 있는 소재지의 오른쪽 왼쪽 사이의 간격을 정해준다.
CollectionViewFlowLayout?.minimumInteritemSpacing = LeftRightSpace
let total = (LeftRightSpace * (numberOfItemsForRow - 1))
let width = (CollectionView.frame.width - total) / numberOfItemsForRow
let height = width
//itemsize : 소재지의 크기를 정 할 수 있다
CollectionViewFlowLayout?.itemSize = CGSize(width: width, height: height)
CollectionView.setCollectionViewLayout(CollectionViewFlowLayout!, animated: true)
}
But when I use simulator with iPhone 8, It make error
Other things are Good! without iPhone 8
enter image description here

Answer 1

I think your total should be calculated as:
let total = LeftRightSpace * (numberOfItemsForRow + 1), because you are taking away left, right and interitem spacing.
Or try calculating width as:
let width = (UIScreen.main.bounds.width - total) / numberOfItemsForRow