November 2013
Intermediate to advanced
576 pages
19h 3m
English
book
iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK
by Kyle Richter, Joe Keeley
Content preview from iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK
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Detecting Hits
Hit detection has always been complex to implement and often required for elaborate text-driven apps. iOS 7 added support for per-character hit detection. In order to support this functionality a subclassed UITextView is created, called ICFCustomTextView in the sample project. The UITextView implements a touchesBegan event method.
When a touch begins, the location in the view is captured and it is adjusted down the y axis by ten to line up with the text elements. A method is invoked on the layoutManager that is a property of the text view, characterIndexForPoint: inTextContainer: fractionOfDistanceBetweenInsertionPoints:. This returns the index of the character that was selected.
After the character index has been determined, ...
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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.