Dynamic line spacing between cells with different heights

Hello,

I have been exploring UICollecitonView and UICollectionViewLayout. For my purposes UICollectionViewFlowLayout its enough. But I want to have that for some items at some index paths the line space between the items will be the minimun, and for the rest, some other value (to a max of 3 points)

I have subclassed UICollectionViewFlowLayout and override these methods:

    override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes!{
       
        var attributes:UICollectionViewLayoutAttributes = super.layoutAttributesForItemAtIndexPath(indexPath)
       
        self.modifyLayoutAttributes(&attributes)
       
        return attributes
    }
   
   
   
    override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
       
        let attributesInRect:[UICollectionViewLayoutAttributes] = super.layoutAttributesForElementsInRect(rect) as! [UICollectionViewLayoutAttributes]
        for var index = 0; index < count(attributesInRect); ++index {
       
            var cellAttributes = attributesInRect[index]
            self.modifyLayoutAttributes(&cellAttributes)
           
        }
       
        return attributesInRect
    }
   
   
    func modifyLayoutAttributes(inout attributes:UICollectionViewLayoutAttributes){
       
        let indexPath = attributes.indexPath
        if let edgeInsets = self.attributesDelegate?.edgeInsetsForRowAt(indexPath) {
            var frame:CGRect = attributes.frame
            frame =  UIEdgeInsetsInsetRect(frame, edgeInsets)
            attributes.frame = frame
        }
       
    }
  

The first time the collection view loads the spacing seems fine, but once I start scrolling all the spacings goes to the minimun spacing....

What I want to achieve is to kinda group cells together based om soome logic so the user will see this cells closer together.

Now something I can't do is to separate into diferent sections, the sectioning logic is working, I have sections by day, but the cells are kinda topics, which when related are under each other I want to have them be closer together as to "visualize" some group made of cells.

Is this even possible?

Thanks

Gustavo.

PS: Im sorry if this was asked before, if so , please any help to give me some lights in the right direction wil lbe much appreciated. 🙂