ios - Stop custom collection view section at needed position -

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i have problem shifting section of collection view. using csstickyheaderflowlayout

so see calculation here:

- (void)updateheaderattributes:(uicollectionviewlayoutattributes *)attributes lastcellattributes:(uicollectionviewlayoutattributes *)lastcellattributes

my section starting @ middle of screen , need know when has origin.y = 64pt should stop moving top.

the problem don't know how current y position of section.


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