WWDC23 SALE: Save 50% on all my Swift books and bundles! >>

Setting up

In this technique project we're going to return to project 7 to solve a critical problem using one of the most important Apple frameworks available: Grand Central Dispatch, or GCD. I already mentioned the problem to you, but here's a recap from project 7:

By downloading data from the internet in viewDidLoad() our app will lock up until all the data has been transferred. There are solutions to this, but to avoid complexity they won't be covered until project 9.

We're going to solve this problem by using GCD, which will allow us to fetch the data without locking up the user interface. But be warned: even though GCD might seem easy at first, it opens up a new raft of problems, so be careful!

If you want to keep your previous work for reference, take a copy of project 7 now and call it project 9. Otherwise, just modify it in place.

Save 50% in my WWDC23 sale.

SAVE 50% To celebrate WWDC23, all our books and bundles are half price, so you can take your Swift knowledge further without spending big! Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testing skills, and more.

Save 50% on all our books and bundles!

BUY OUR BOOKS
Buy Pro Swift Buy Pro SwiftUI Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let us know!

Average rating: 5.0/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.