100 Days of SwiftUI

Day 51

2026-06-24

Project 10, part 3

Finishing up the basic app. Networking!!!

Checking for a valid address

• this validation is simply checking that the fields have data in them, not going to the USPS API to check for validity.

Not that I have any idea of how to actually use it

Preparing for checkout

• basically 2 parts: the UI and packaging the Order for sending to someplace.
• uses Decimal instead of Double (I think this is new?) which behind the scenes converts it to integers and does the math without rounding risk

Sending and receiving orders over the internet

• Using the async / await language we learned a couple days ago
• Buttons don’t like waiting, so the action needs to be placed inside a task
• a site for testing URL requests https://reqres.in – free for low use
  
  • however, you need an API key HWS forum post
  • still free, but you need to have a login
  • add to the URL Request request.setValue("your-personal-api-key-from-reqres", forHTTPHeaderField: "x-api-key")
• we set up the CodingKeys: CodingKey enumeration again, but it cannot be used for calculated properties, such as cost.
  • That implies that the server needs to be able to do the calculation from the submitted order details, doesn’t it?

Tip

XCode regex uses $1 syntax for captured blocks