March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Scrolling
For the most part, the purpose of a scroll view will be to let the user scroll. A number of properties affect the user experience with regard to scrolling:
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scrollEnabled - If NO, the user can’t scroll, but you can still scroll in code (as explained later in this section). You could put a UIScrollView to various creative purposes other than letting the user scroll; for example, scrolling in code to a different region of the content might be a way of replacing one piece of interface by another, possibly with animation.
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scrollsToTop - If YES (the default), and assuming scrolling is enabled, the user can tap on the status bar as a way of making the scroll view scroll its content to the top. You can also override this setting dynamically through the scroll view’s delegate (discussed later in this chapter).
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bounces -
If YES (the default), then when the user scrolls to a limit of the content, it is possible to scroll somewhat further (possibly revealing the scroll view’s
backgroundColorbehind the content, if a subview was covering it); the content then snaps back into place when the user releases it. Otherwise, the user experiences the limit as a sudden inability to scroll further in that direction. -
alwaysBounceVertical,alwaysBounceHorizontal -
If YES, and assuming that
bouncesis YES, then even if thecontentSizein the given dimension isn’t larger than the scroll view (so that no scrolling is actually possible in that dimension), the user can nevertheless scroll somewhat and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.