Center on closest page

[kornerr]

1. Scroll verticall based on pan
2. Animate to finish scrolling based on 50% of needed distance passage when pan finished in specific item (pan can finish in the next item)

[kornerr]

Scrolling vertically is ready.

[kornerr]

Here's the full list of issues to have complete control over scrolling:

• finish animating to the center of item once pan is released
• keep items in parent bounds
• (paging)

I think I should try to manually control UIScrollView instead of re-implementing UIScrollView myself.

[kornerr]

TODO:

• when user releases the finger, scroll to the closest (to the center) item.