April 2020
Intermediate to advanced
528 pages
15h 40m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, 7th Edition
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Appearing and Disappearing Views
Whenever a UINavigationController is about to swap views, it calls two methods: viewWillDisappear(_:) and viewWillAppear(_:). The UIViewController that is about to be popped off the stack has viewWillDisappear(_:) called on it. The UIViewController that will then be on top of the stack has viewWillAppear(_:) called on it.
To hold on to changes in the data, when a DetailViewController is popped off the stack you will set the properties of its item to the contents of the text fields. When implementing these methods for views appearing and disappearing, it is important to call the superclass’s implementation – it might have some work to do and needs to be given the chance to do it.
In DetailViewController.swift ...
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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.