How do you determine spacing between cells in UICollectionView flowLayout

Question

I have a UICollectionView with a flow layout and each cell is a square. How do I determine the spacing between each cells on each row? I can\'t seem to find the appropriate

Answer 1

a swift version base on mokagio:https://github.com/fanpyi/UICollectionViewLeftAlignedLayout-Swift

class UICollectionViewLeftAlignedLayout: UICollectionViewFlowLayout {
    override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributesToReturn = super.layoutAttributesForElementsInRect(rect)
        if let attributesToReturn = attributesToReturn {
            for attributes in attributesToReturn {
                if attributes.representedElementKind == nil {
                    let indexpath = attributes.indexPath
                    if let attr = layoutAttributesForItemAtIndexPath(indexpath) {
                        attributes.frame = attr.frame
                    }

                }
            }
        }
        return attributesToReturn
    }

    override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
        if  let currentItemAttributes = super.layoutAttributesForItemAtIndexPath(indexPath){
            let sectionInset = self.evaluatedSectionInsetForItemAtIndex(indexPath.section)
            let  isFirstItemInSection = indexPath.item == 0;
            let  layoutWidth = CGRectGetWidth(self.collectionView!.frame) - sectionInset.left - sectionInset.right;

            if (isFirstItemInSection) {
                currentItemAttributes.leftAlignFrameWithSectionInset(sectionInset)
                return currentItemAttributes
            }

            let  previousIndexPath = NSIndexPath(forItem: indexPath.item - 1, inSection: indexPath.section)

            let previousFrame = layoutAttributesForItemAtIndexPath(previousIndexPath)?.frame ?? CGRectZero
            let  previousFrameRightPoint = previousFrame.origin.x + previousFrame.width
            let currentFrame = currentItemAttributes.frame;
            let  strecthedCurrentFrame = CGRectMake(sectionInset.left,
                currentFrame.origin.y,
                layoutWidth,
                currentFrame.size.height)
            // if the current frame, once left aligned to the left and stretched to the full collection view
            // widht intersects the previous frame then they are on the same line
            let  isFirstItemInRow = !CGRectIntersectsRect(previousFrame, strecthedCurrentFrame)

            if (isFirstItemInRow) {
                // make sure the first item on a line is left aligned
                currentItemAttributes.leftAlignFrameWithSectionInset(sectionInset)
                return currentItemAttributes
            }

            var frame = currentItemAttributes.frame;
            frame.origin.x = previousFrameRightPoint + evaluatedMinimumInteritemSpacingForSectionAtIndex(indexPath.section)
            currentItemAttributes.frame = frame;
            return currentItemAttributes;

        }
        return nil
    }
    func evaluatedMinimumInteritemSpacingForSectionAtIndex(sectionIndex:Int) -> CGFloat {
        if let delegate = self.collectionView?.delegate as? UICollectionViewDelegateFlowLayout {
            if delegate.respondsToSelector("collectionView:layout:minimumInteritemSpacingForSectionAtIndex:") {
                return delegate.collectionView!(self.collectionView!, layout: self, minimumInteritemSpacingForSectionAtIndex: sectionIndex)

            }
        }
        return self.minimumInteritemSpacing

    }
    func evaluatedSectionInsetForItemAtIndex(index: Int) ->UIEdgeInsets {
        if let delegate = self.collectionView?.delegate as? UICollectionViewDelegateFlowLayout {
            if  delegate.respondsToSelector("collectionView:layout:insetForSectionAtIndex:") {
                return delegate.collectionView!(self.collectionView!, layout: self, insetForSectionAtIndex: index)
            }
        }
        return self.sectionInset
    }
}