June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second 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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Deleting Rows
In editing mode, the red circles with the dash (shown in Figure 11.7) are deletion controls, and touching one should delete that row. However, at this point, touching a deletion control doesn’t delete anything. (Try it and see.) Before the table view will delete a row, it sends its data source a message about the deletion and waits for confirmation before pulling the trigger.
A UITableView asks its data source for the cells it should display when it is first loaded and at least three other times:
- when the user scrolls the table view
- when the table view is removed from the view hierarchy and then added back to the view hierarchy
when an object sends it the message reloadData
Now consider what would happen if deleting a row ...
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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.