March 2012
Intermediate to advanced
590 pages
22h 48m
English
Content preview from iOS Programming: The Big Nerd Ranch GuideBecome 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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Detecting Taps with UITapGestureRecognizer
The first UIGestureRecognizer subclass you will use is UITapGestureRecognizer. When the user taps a line in TouchTracker, you will present a menu that allows them to delete it. Open TouchTracker.xcodeproj from Chapter 19.
In the first part of this section, we are going to recognize a tap, determine which line is close to where the tap occurred, store a reference to that line, and change that line’s color to green so that the user knows it has been selected.
In TouchDrawView.m, edit the initWithFrame: method to create an instance of UITapGestureRecognizer and attach it to the TouchDrawView being initialized.
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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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