iPhone - Nesting UIScrollViews for horizontal paging and vertical scrolling

user_389739 0
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I'm developing my first iPhone app and I would greatly appreciate you guy's input on a problem I'm having.

I'm looking to implement scrolling both horizontally and vertically. I want the horizontal scrolling to be paged, without the vertical one being paged (scrolling "normally"). A single UIScrollView with pagingEnabled set to YES will page in both directions. The natural solution would be to nest a UIScrollView inside another one, however when I do that, I can't get the "inner" UIScrollView to scroll at all. Seems the outer one is "eating" up all the tap events, like in:

UIScrollView : paging horizontally, scrolling vertically?

I read something about "inner scrolling" being improved upon in SDK 3.0 and actually when I add an inner UITableView instead of a UIScrollView the scrolling works flawlessly. Since UITableView subclasses UIScrollView I imagine that my desired behavior should be achievable by making my own subclass of UIScrollView.

Is this the right approach? If so, what should this subclass look like?

paging uiscrollview scroll iphone
5 Answers

If you are trying something like Twitter profile UI I achieved this by putting header view and bottom scrollview in a a parent scrollview and underlaying another scrollview behind.

Underlaying scrollview is responsible for the adjusting content offsets of header and bottom. Its contentsize is also adjusted by the inner item heights.

It looks complicated when I tell, better see the code https://github.com/OfTheWolf/Twitterprofile

user_59236060

What Dylan says. And, perhaps of interest on this topic - you do not need to enable scrolling in the master "paging" UIScrollView, just enable paging and direction lock. This seems to assure that all vertical scrolling cues go to the nested, fixed-size, vertical-scrolling NSScrollViews. It works back to at least iOS 9.

user_52863050
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