【SwiftUI + SwiftData】List のアイテムの Preview 👉 https://android.benigumo.com/20240725/preview-one-item/

PreviewOneModelView.swift

import SwiftUI
import SwiftData

struct PreviewOneModelView<Model: PersistentModel, Content: View>: View {
  var content: (Model) -> Content
  @Query private var models: [Model]

  var body: some View {
    content(models.first!)
  }
}

/* ex.

#Preview {
  PreviewOneModelView { item in
    ItemView(item: item)
  }
  .modelContainer(for: Item.self, inMemory: false)
}

*/