NEW: Learn to build the incredible iOS 15 Weather app today! >>

Cupcake Corner: Wrap up

Paul Hudson    @twostraws   

Hopefully this project has shown you how to take the skills you know – SwiftUI’s forms, pickers, steppers, and navigation – and build them into an app that sends all the user’s data off to a server and processes the response.

You might not realize this yet, but the skills you learned in this project are the most important skills for the vast majority of iOS developers: take user data, send it to a server, and process the response probably accounts for half the non-trivial apps in existence. Yes, what data gets sent and how it’s used to update the UI varies massively, but the concepts are identical.

Review what you learned

Anyone can sit through a tutorial, but it takes actual work to remember what was taught. It’s my job to make sure you take as much from these tutorials as possible, so I’ve prepared a short review to help you check your learning.

Click here to review what you learned in this project.

Challenge

One of the best ways to learn is to write your own code as often as possible, so here are three ways you should try extending this app to make sure you fully understand what’s going on.

  1. Our address fields are currently considered valid if they contain anything, even if it’s just only whitespace. Improve the validation to make sure a string of pure whitespace is invalid.
  2. If our call to placeOrder() fails – for example if there is no internet connection – show an informative alert for the user. To test this, try commenting out the request.httpMethod = "POST" line in your code, which should force the request to fail.
  3. For a more challenging task, see if you can convert our data model from a class to a struct, then create an ObservableObject class wrapper around it that gets passed around. This will result in your class having one @Published property, which is the data struct inside it, and should make supporting Codable on the struct much easier.

Hacking with Swift+ subscribers can get a complete video solution for this checkpoint here: Solution to Cupcake Corner. If you don’t already subscribe, you can start a free trial today.

Hacking with Swift is sponsored by Sentry

SPONSORED With Sentry’s error and performance monitoring for iOS, you see mobile vitals that actually matter, can solve any latency issues quickly, and learn how each release is performing over time.

Learn More

Sponsor Hacking with Swift and reach the world's largest Swift community!

BUY OUR BOOKS
Buy Pro Swift 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 (Vapor Edition) 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 Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 4.8/5

 
Unknown user

You are not logged in

Log in or create account
 

Link copied to your pasteboard.