ios - How to create UIScrollView with different page sizes (page snapping, bounce) -

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i'm trying create custom vertical uiscrollview handle multiple pages different page heights.

assumptions:

  • page height equal or greater screen height
  • if page taller screen height, scrolls usual uiscrollview – bouncing on top , bottom
  • if user ends scrolling , "page break" in middle of screen
    • if there no velocity - page snaps closest
    • if there velocity - page changes 1 in direction of swipe

i've tried many approaches achieve this, i've stumbled upon many uiscrollview quirks, make hard.

problems:

  • uipangesturerecognizer has unreliable method getting velocity (velocityinview:)
  • scrollviewwillenddragging:withvelocity:targetcontentoffset: method gives me headache, because arbitrarily can destroy attempts animate setting content offset
  • i don't know how achieve bounce in 1 of middle pages, i'm afraid have rewrite whole scrolling handling
  • when try override setting content offset when uiscrollview decelerating,
    • my content offset set
    • deceleration continues beyond content offset set

bonus

i have tried putting uiscrollview inside uiscrollview page, approach pain in neck. example when @ bottom of inside scroll, scrolled down bit, put finger away , grabbed again , scrolled upwards, outer scroll received touch, messed inside scroll presentation.

does have idea how this? tips helpful i'm stuck...

try this. might help. based on circa news app.

https://www.cocoacontrols.com/controls/rscircapagecontrol


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