antigravity-skills-reference/skills/swiftui-ui-patterns/references/media.md

Media (images, video, viewer)

Intent

Use consistent patterns for loading images, previewing media, and presenting a full-screen viewer.

Core patterns

• Use LazyImage (or AsyncImage) for remote images with loading states.
• Prefer a lightweight preview component for inline media.
• Use a shared viewer state (e.g., QuickLook) to present a full-screen media viewer.
• Use openWindow for desktop/visionOS and a sheet for iOS.

Example: inline media preview

struct MediaPreviewRow: View {
  @Environment(QuickLook.self) private var quickLook

  let attachments: [MediaAttachment]

  var body: some View {
    ScrollView(.horizontal, showsIndicators: false) {
      HStack {
        ForEach(attachments) { attachment in
          LazyImage(url: attachment.previewURL) { state in
            if let image = state.image {
              image.resizable().aspectRatio(contentMode: .fill)
            } else {
              ProgressView()
            }
          }
          .frame(width: 120, height: 120)
          .clipped()
          .onTapGesture {
            quickLook.prepareFor(
              selectedMediaAttachment: attachment,
              mediaAttachments: attachments
            )
          }
        }
      }
    }
  }
}

Example: global media viewer sheet

struct AppRoot: View {
  @State private var quickLook = QuickLook.shared

  var body: some View {
    content
      .environment(quickLook)
      .sheet(item: $quickLook.selectedMediaAttachment) { selected in
        MediaUIView(selectedAttachment: selected, attachments: quickLook.mediaAttachments)
      }
  }
}

Design choices to keep

• Keep previews lightweight; load full media in the viewer.
• Use shared viewer state so any view can open media without prop-drilling.
• Use a single entry point for the viewer (sheet/window) to avoid duplicates.

Pitfalls

• Avoid loading full-size images in list rows; use resized previews.
• Don’t present multiple viewer sheets at once; keep a single source of truth.