Implement sizeForItemAt
method according to the view's frame size
Swift
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let height = view.frame.size.height
let width = view.frame.size.width
// in case you you want the cell to be 40% of your controllers view
return CGSize(width: width * 0.4, height: height * 0.4)
}
Objective C
- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CGFloat height = self.view.frame.size.height;
CGFloat width = self.view.frame.size.width;
// in case you you want the cell to be 40% of your controllers view
return CGSizeMake(width * 0.4, height * 0.4);
}