Why strange lines displaying in collection view? - ios

Question

I am currently working in creating a custom calendar where I tried to display Seven cells in a row , But unfortunately some lines occurs randomly can any one guide the error.I have attached the screen shot
I have attached the sample code:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let s = CGSize(width: CGFloat(UIScreen.main.bounds.size.width / 7), height: CGFloat(UIScreen.main.bounds.size.height / 7))
return s
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(0,0,0,0)
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return numDays+weekday
}

Answer 1

You can manage it by UICollectionViewDelegateFlowLayout methods
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0 // OR change as you need
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0 // OR change as you need
}

Answer 2

This behaviour appears when you compute the size of your cell.
Hear, you are doing :
func collectionView(_ collectionView: UICollectionView, layout
collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let s = CGSize(width: CGFloat(UIScreen.main.bounds.size.width / 7), height: CGFloat(UIScreen.main.bounds.size.height / 7))
return s
}
The cell's size may not be rounded, therefor the runtime tries to do its best to fill the collection view with your constraints but end up with these little flaws.