Super Simple In-App Purchase Demo

Overview

This app aims to demonstrate a minimal setup for an in-app purchase, using the most up-to-date available tools at time of writing. Namely:

• StoreKit 2
• SwiftUI
• Observability framework
• iOS 17+ StoreKit views (ProductView, StoreView or SubscriptionStoreView)

I've assumed the following requirements:

• A single, non-consumable in-app purchase. Typically this would be used for unlocking a premium feature.
• Must cater for Strong Customer Authentication (SCA) or Ask to Buy.
• Must work online and offline.
• Must handle purchases that took place on another device.

Why did I make this?

As I've been learning StoreKit 2, I've tried to create a sample app that demonstrates the best practices as I understand them.

While Apple's Backyard Birds sample code is comprehensive, it contains a lot more than I need and is rather overwhelming.

Other examples that I've read are typically out-of-date or incomplete in some aspect. For example, they may be using StoreKit views but not the new observability framework. Or they may demonstrate handling a purchase, but not how to check for existing purchases on app start-up.

This demo app is intended to fill these gaps, document my learnings and serve as a quick reference. I want it to be a minimal, end-to-end, working example.

As this topic and my understanding of it continue to evolve, I have no doubt that this repository will soon also be out-of-date and/or incomplete. 🙂

Running the app

The app uses a StoreKit configuration file for local testing.

• Click the scheme and choose Edit Scheme.
• Go to the Options tab.
• For StoreKit Configuration, select SuperSimpleInAppPurchaseConfig.storekit.

Now the app is ready to run on simulator or device.

References

https://developer.apple.com/documentation/swiftui/backyard-birds-sample https://developer.apple.com/documentation/storekit/in-app_purchase/implementing_a_store_in_your_app_using_the_storekit_api https://github.com/RevenueCat/storekit2-demo-app https://swiftwithmajid.com/2023/08/01/mastering-storekit2/ https://www.hackingwithswift.com/quick-start/swiftui/how-to-add-in-app-purchases-in-swiftui