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,
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.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.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.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.
UIControl
UIControl is a subclass of UIView whose chief purpose is to be the superclass of several further built-in classes and to endow them with common behavior. These are classes representing views with which the user can interact (controls).
The most important thing that controls have in common is that they automatically track and analyze touch events (Chapter 18) and report them to your code as significant control events by way of action messages. Each control implements some subset of the possible control events. The full set of control events is listed under UIControlEvents in the Constants section of the UIControl class documentation:
-
UIControlEventTouchDown -
UIControlEventTouchDownRepeat -
UIControlEventTouchDragInside -
UIControlEventTouchDragOutside -
UIControlEventTouchDragEnter -
UIControlEventTouchDragExit -
UIControlEventTouchUpInside -
UIControlEventTouchUpOutside -
UIControlEventTouchCancel -
UIControlEventValueChanged -
UIControlEventEditingDidBegin -
UIControlEventEditingChanged -
UIControlEventEditingDidEnd -
UIControlEventEditingDidEndOnExit -
UIControlEventAllTouchEvents -
UIControlEventAllEditingEvents -
UIControlEventAllEvents
The control events also have informal names that are visible in the Connections inspector when you’re editing a nib. I’ll mostly use the informal names in the next couple of paragraphs.
Control events fall roughly into three groups: the user has touched the screen (Touch Down, Touch Drag Inside, Touch Up Inside, etc.), edited text (Editing Did Begin, ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.