Revisiting the S'banken API with SwiftUI

Back in September 2018 I wrote about using the new S'banken API to create a pocket money app for iOS - since they didn't have one at the time.

The still don't - but - iOS development has moved on a bit since then - notably with the release last year of SwiftUI.

In this series - we will take a look at creating the app from scratch - but using SwiftUI and some helper libraries.


Recap

The S'banken API provides several functions. In the previous application - we used:

  • Authorization
  • Get list of accounts
  • Get account details

To do this - we needed 3 values:

  • The client ID (applikasjonsnøkkel)
  • The client secret (generated on the developer portal - usually valid for 3 months)
  • The ID number of the account owner (fødselsnummer - 11 digits)

The authorization uses client credentials grant flow.


The plan

Entering the new client secret every 90 days got old quite fast. The new app will be provided with 4 values:

  • The client ID (applikasjonsnøkkel)
  • The client secret (generated on the developer portal - usually valid for 3 months)
  • The ID number of the account owner (fødselsnummer - 11 digits)
  • The bank account ID

These will be provided via QR code (remember not to share the code) to simplify data entry

SwiftUI will be used instead of Swift+Storyboards. SwiftUI is not quite as feature complete as Swift+Storyboards yet - but it is fully usable.

We will make use of the new Swift Package Manager for dependencies. Initial libraries I expect to use are:

  • Alamofire - network calls (if S'banken adds their API library to Swift Package Manager instead of Carthage we'll revisit this)
  • Code Scanner - wraps up the QR scanner in a nice swift UI component
  • SwiftUI Refresh - implements pull to refresh for Swift UI

GitHub Repository