Does not work properly with auto layout cell sizing about ktcenterflowlayout HOT 6 CLOSED

Hey @damienrambout. Thanks for that. I'm not familiar with what UICollectionViewFlowLayout does under the hood exactly in that case.

This class just hijacks the layoutAttributesForElementsInRect method on flow layout. I would sort of expect all the sizing to be determined at that point (auto-layout or otherwise). But there are probably differences that we need to account for.

I will investigate when I can. Feel free to dig deeper!

from ktcenterflowlayout.

Thank you very much! I spent the last two days trying to figure out why my swift implementation wasn't working and now I see this post... I came to the exact same conclusion that @damienrambout pointed out. If you come up with something please let me know! I'll do the same.
Cheers!

from ktcenterflowlayout.

One solution, which is not efficient but works, is to use the existing implementation of layoutAttributesForElementsInRect to implement layoutAttributesForItemAtIndexPath, by defining a rect that grabs all elements and then just picking out the one you want using its indexPath, as follows:

override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes! {
        let modifiedLayoutAttributes = self.layoutAttributesForElementsInRect(CGRectInfinite)

        if let desiredLayAttr = modifiedLayoutAttributes?.filter({ indexPath.isEqual($0.indexPath) }).first as? UICollectionViewLayoutAttributes {
            return desiredLayAttr
        }
        else
        {
            NSLog("error")
            return super.layoutAttributesForItemAtIndexPath(indexPath)
        }
    }

from ktcenterflowlayout.

Hi guys, I am running into the same issue with auto-layout based cells, but I believe I have come a good way at hunting this down.

When I am laying it out, I don't get the nice spacing I used to before individual cell sizing, I can get to getting nice spacing if I in

func preferredLayoutAttributesFittingAttributes(layoutAttributes: UICollectionViewLayoutAttributes) -> UICollectionViewLayoutAttributes

just return layoutAttributes. However, when I have a implementation that returns the size I want, the layout collapses to this:

The really interesting thing is that if I rotate, and then rotate back, I get the expected look:

You can find the project here: https://github.com/skylib/SnapTagsView/tree/DemoForKTCenterFlowLayout and the function referred to above lives in SnapTagsView/SnapTagCell.swift. Just run the example app in it and you'll see exactly what I mean. (you'll need to do a pod install before compiling it)

Cheers

from ktcenterflowlayout.

thanks @niklassaers i'll check it out

from ktcenterflowlayout.

I'm also noticing that this layout class does not seem to work with auto sizing collection view cells.

Anyone know any alternatives? 😅 I'll probably just be left-aligning for now

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