DAY 37
Project 7, part 2
Today you’re going to build a complete app using @ObservedObject, @Published, sheet(), Codable, UserDefaults, and more. I realize that seems like a lot, but I want you to try to think about all the things that are happening in the background:
@Publishedpublishes change announcements automatically.@StateObjectwatches for those announcements and refreshes any views using the object.sheet()watches a condition we specify and shows or hides a view automatically.Codablecan convert Swift objects into JSON and back with almost no code from us.UserDefaultscan read and write data so that we can save settings and more instantly.
Yes, we need to write the code to put those things in place, but so much boilerplate code has been removed that what remains is quite remarkable. As French writer and poet Antoine de Saint-Exupery once said, “perfection is achieved not when there is nothing more to add, but rather when there is nothing more to take away.”
Today you have five topics to work through, in which you’ll put into practice everything you learned about @StateObject, sheet(), onDelete(), and more.
- Building a list we can delete from
- Working with Identifiable items in SwiftUI
- Sharing an observed object with a new view
- Making changes permanent with UserDefaults
- Final polish
That’s another app built, and lots more techniques used in context too – great job!
Share your progress!
If you use Twitter, the button below will prepare a tweet saying you completed today, along with a celebratory graphic, the URL to this page, and the challenge hashtag. Don't worry – it won't be sent until you confirm on Twitter!
Need help? Tweet me @twostraws!
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.
100 Days of SwiftUI
The 100 Days of SwiftUI is a free collection of videos, tutorials, tests, and more to help you learn SwiftUI faster. Click here to learn more, or watch the video below.
