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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Delegation
Control events – such as .touchUpInside and .valueChanged – provide controls with a convenient, predefined list of triggers to call their action methods on their targets. But sometimes you want a control to report something that is not one of its predefined events. To have a control send a custom message to a listening object, you can use the delegation pattern.
Delegation is an object-oriented approach to callbacks. A callback is a function that is supplied in advance of an event and is called every time the event occurs. Some objects need to make a callback for more than one event. For instance, the text field needs to “call back” when the user enters text as well as when the user hits the Return key (depending on the ...
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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.