In this pull request I fixed retain cycle between GroupRenderer and NodeRenderer:
parentRenderer should not be strong, because GroupRenderer also strongly referencing to his child renderers.
I saw that you are trying to broke the retain cycle in dispose() method inside deinit, but deinit won't be called while this retain cycle exists and I didn't see any other place where dispose() method could be called from outside.
Updates
In this pull request I fixed retain cycle between
GroupRendererandNodeRenderer:parentRenderershould not be strong, becauseGroupRendereralso strongly referencing to his child renderers.I saw that you are trying to broke the retain cycle in
dispose()method insidedeinit, butdeinitwon't be called while this retain cycle exists and I didn't see any other place wheredispose()method could be called from outside.