December 2016
Intermediate to advanced
416 pages
15h 21m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, 6th Edition
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Another Label
The animation works great the first time the Next Question button is pressed, but there is no visible animation on subsequent button presses because the label already has an alpha value of 1. In this section, you are going to add another label to the interface. When the Next Question button is pressed, the existing label will fade out while the new label (with the text of the next question) will fade in.
At the top of ViewController.swift, replace your declaration of a single label with two labels.
@IBOutlet var questionLabel: UILabel!@IBOutlet var currentQuestionLabel: UILabel! @IBOutlet var nextQuestionLabel: UILabel! @IBOutlet var answerLabel: UILabel!
Xcode flags four places where you need to replace questionLabel ...
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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.