iphone - Animate UICollectionView Cell Insert along a curved path -

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i have circular uicollectionview places each item distance apart each other along circular path. when insert item i'm specifying it's starting position in

- (uicollectionviewlayoutattributes *)initiallayoutattributesforappearingitematindexpath:(nsindexpath *)itemindexpath

then, how understand, layout perform animation start point, point specify in - (uicollectionviewlayoutattributes *)layoutattributesforitematindexpath:(nsindexpath *)path

this results in straight line animation, point point b. able specify path animation, move along curved path rather straight one.

any ideas?


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