March 2014
Intermediate to advanced
672 pages
40h 11m
English
Content preview from The Core iOS Developer’s Cookbook, Fifth 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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Intercepting and Forwarding Touch Events
The key to this overlay lies in intercepting touch events, creating a floating presentation above your normal interface, and then forwarding those events on to your application. A TOUCHkit view lies on top of your interface. The custom window class grabs user touch events and presents them as circles in the TOUCHkit view. It then forwards them as if the user were interacting with a normal UIWindow. To accomplish this, this recipe uses event forwarding.
Event forwarding is achieved by calling a secondary event handler. The TOUCHOverlayWindow class overrides UIWindow’s sendEvent: method to force touch drawing and then invokes its superclass implementation to return control to the normal responder chain. ...
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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.
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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.