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.
TAKE YOUR SKILLS TO THE NEXT LEVEL If you like Hacking with Swift, you'll love Hacking with Swift+ – it's my premium service where you can learn advanced Swift and SwiftUI, functional programming, algorithms, and more. Plus it comes with stacks of benefits, including monthly live streams, downloadable projects, a 20% discount on all books, and free gifts!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Link copied to your pasteboard.