May 2011
Beginner
834 pages
25h 19m
English
Content preview from Programming iOS 4Become 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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Restricting Touches
Touch events can be turned off entirely at the application level with UIApplication’s beginIgnoringInteractionEvents. It is quite common to do this during animations and other lengthy operations during which responding to a touch could cause undesirable results. This call should be balanced by endIgnoringInteractionEvents. Pairs can be nested, in which case interactivity won’t be restored until the outermost endIgnoringInteractionEvents has been reached.
A number of high-level UIView properties also restrict the delivery of touches to particular views:
-
userInteractionEnabled - If set to NO, this view (along with its subviews) is excluded from receiving touches.
-
hidden - If set to YES, this view (along with its subviews) is excluded from receiving touches.
-
opacity -
If set to
0.0(or extremely close to it), this view (along with its subviews) is excluded from receiving touches. -
multipleTouchEnabled - If set to NO, this view never receives more than one touch simultaneously; once it receives a touch, it doesn’t receive any other touches until that first touch has ended.
-
exclusiveTouch -
This is the only one of these properties that can’t be set in the nib. An
exclusiveTouchview receives a touch only if no other views in the same window have touches associated with them; once anexclusiveTouchview has received a touch, then while that touch exists no other view in the same window receives any touches.
Note
A UIWindow ignores multipleTouchEnabled; it always receives ...
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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.