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SwiftData Dependency Injection in SwiftUI Application

Most of the examples Apple provides to demonstrate Dependency Injection in SwiftUI use @Environment. When creating a new project with SwiftData in XCode, you’ll notice that the template uses Environment for injecting the modelContext.

Swift

  

struct ContentView: View {
    @Environment(\.modelContext) private var modelContext // <-- 1
    @Query private var items: [Item]

    var body: some View {
        NavigationSplitView {
            List {
                ...
            }
            .toolbar {
                ToolbarItem {
                    Button(action: addItem) {
                        ...
                    }
                }
            }
        }
        ...
    }

    private func addItem() {
        withAnimation {
            let newItem = Item(timestamp: Date())
            modelContext.insert(newItem) // <-- 2
        }
    }

    ...
}

#Preview {
    ContentView()
        .modelContainer(for: Item.self, inMemory: true) // <-- 3
}

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