AttachmentThumbnail

public struct AttachmentThumbnail

extension AttachmentThumbnail: View

extension AttachmentThumbnail: _ViewEmptyChecking

AttachmentThumbnail is a specialized UI component that renders previews for attachment files asynchronously.

This component intelligently handles different file types by:

Initially displaying appropriate static file type icons while loading
Generating thumbnail previews for supported file types (images, PDFs, etc.)
Maintaining the file type icon for non-previewable file types
Adapting its appearance based on control state (normal, disabled, read-only)

The thumbnail generation process happens in the background to maintain UI responsiveness, and the component automatically updates when the preview becomes available.

Usage

Use AttachmentThumbnail within an Attachment component to display file previews:

// Basic usage with an image file
Attachment {
  AttachmentThumbnail(url: imageURL)
} attachmentTitle: {
  Text("Photo")
} attachmentSubtitle: {
  Text("2.5MB")
} attachmentFootnote: {
  Text("Oct 20, 2025")
}

// Usage with a PDF document
Attachment {
  AttachmentThumbnail(url: pdfURL, controlState: viewModel.isEditable ? .normal : .readOnly)
} attachmentTitle: {
  Text("Contract")
} attachmentSubtitle: {
  Text("PDF • 1.2MB")
} attachmentFootnote: {
  Text("Last modified today")
}

The component can also be used standalone when needed:

AttachmentThumbnail(url: fileURL)


                      
                      
                      init(url:controlState:componentIdentifier:)

Undocumented

Declaration

Swift

public init(url: URL,
            controlState: ControlState = .normal,
            componentIdentifier: String? = AttachmentThumbnail.identifier)

identifier
Undocumented
Declaration
Swift

static let identifier: String


                      
                      
                      init(_:)

Undocumented

Declaration

Swift

init(_ configuration: AttachmentThumbnailConfiguration)


                      
                      
                      body

Declaration

Swift

@MainActor
public var body: some View { get }

isEmpty
Undocumented
Declaration
Swift

public var isEmpty: Bool { get }