ios - UICollectionView changing layout selected item and frame/constraints -

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i've got collection view i'm dynamically changing between layout looks uitableview , layout looks sort of timemachine carousel i'm calling "swipelayout" (which doesn't swiping right now, eventually).

btw, entire project here: https://github.com/supertango/collectionviewlayoutswitching. under master branch tag "initial_question"

the initial layout table layout, when item tapped, change layout "swipelayout" animation (and again). in viewcontroller, have:

func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath) {     nslog("index path chosen: \(indexpath)")     changelayouttapped(self) }  @ibaction func changelayouttapped(sender: anyobject) {     if (self.collectionview.collectionviewlayout == tablelayout) {         self.collectionview.setcollectionviewlayout(swipelayout, animated: true)         self.mode = mode.swipe     } else {         self.collectionview.setcollectionviewlayout(tablelayout, animated: true)         self.mode = mode.table     } }

the code swipelayout bit long, don't want put in question, here's link it: https://github.com/supertango/collectionviewlayoutswitching/blob/initial_question/collectionviewlayouts/swipelayout.swift

here's transition looks like:

transition starting @ 0 @ full speed

for part, looks good. however, if start tap on element other zero, happens:

transition starting @ 4 @ full speed

i can't figure out why goes through transition , snaps showing 0 element first.

here's looks after turning on slow transitions in sim:

transition starting @ 4 @ slow speed

i've tried setting selected element on collection view so:

func collectionview(collectionview: uicollectionview, didselectitematindexpath indexpath: nsindexpath) {     nslog("index path chosen: \(indexpath)")     self.swipelayout.startingitemindex = indexpath.item     changelayouttapped(self) }

but no luck there.

any ideas?

extra bonus if can tell me how contents (the numbers inside) stay centered in middle of view during entire transition.

thanks.


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