Diploma in Apple Development 🍎👩🏻‍💻: Coding 2: Lecture 4: The Observable macro and SwiftData.
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👋🏻 Hi!

First, don't forget to confirm your attendance using the Seats Mobile app!

Second, I'm going to start every lecture with a meditation from the fantastic Sitting Still Like a Frog book, all read by Myla Kabat-Zinn. If you don't want to participate that's completely fine.

Let's start by watching this video from WWDC23: Discover Observation in SwiftUI.

Please open up Xcode as we are going to do a new activity, a "Code-along" from Apple: Start building with Swift and SwiftUI.

Let's continue by watching this video from WWDC23: Meet SwiftData.

Let's finish by reviewing the following articles from developer.apple.com:

• The basic concepts of data within SwiftUI - having a single source of truth in your app - aka a data Model. Why might it be important to have a single source of truth?
• Migrating from the Observable Object protocol to the Observable macro - this is useful to read because you might find some old example code from Apple that uses the old way of doing things.
• Managing model data in your app - create connections between your app’s data model and views, using the @Observable macro. Is everyone clear on what a macro is?
• Preserving your app’s model data across launches - let's review your knowledge of SwiftData.
• Finally, realise that if you use the Xcode template for a visionOS app, with RealityKit as the Immersive Space Renderer and a Mixed Immersive space, you get an @Observable AppModel class automatically, and both the ContentView and ImmersiveView are passed the AppModel via the .environment modifier, in the App structure.

Thanks! As always, please review all today's content as homework.
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