December 2014
Intermediate to advanced
480 pages
11h 31m
English
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Chapter 12. Table Views and Collection Views
One of the most common tasks for any app, regardless of platform, is displaying lists or collections of data. iOS and OS X provide a number of tools for viewing data, and in this chapter you’ll learn how to use them.
Both iOS and OS X feature table views and collection views. A table view is designed to provide a list of data, while a collection view is designed to show a grid of data. Both table views and collection views can be customized to provide different layouts.
Table views are used all over OS X—Finder and iTunes both use it to show lists of files and songs. Table views are used even more heavily in iOS—any time you see a vertically scrolling list, such as the list of messages in Messages or the options in Settings, you’re seeing a table view.
Collection views are used a little less frequently, as they’re a newer addition to both platforms. Collection views can be seen (again) in Finder and iTunes, as well as in Launchpad. On the iPad, a collection view appears in the Clock application, which was added in iOS 6.
Data Sources and Delegates
Despite their differences in layout, table and collection views have very similar APIs. When a data display view prepares to show content, it has to know the answers to at least two questions:
- How many items am I showing?
- For each item, what do I need to do to display it?
These questions are asked of the view’s data source, which is an object that conforms to the table view’s data source protocol ...
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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.