# Share Extension

> Share extension: share sheet integration, content validation, App Group data sharing between app and extension. Use when enabling share-from-other-apps functionality, receiving shared content, or sharing data via App Groups. Triggers: share extension, share sheet, NSExtensionContext, App Group, SLComposeServiceViewController.

- Skill: `abdullah4ai/share-extension-2` (Agent Skill)
- Install (CLI): `npx skillmds@latest add abdullah4ai/share-extension-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/abdullah4ai/share-extension-2/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: abdullah4ai (https://skillmd.com/u/abdullah4ai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/abdullah4ai/share-extension-2

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# Share Extension

SHARE EXTENSION:
SETUP: Requires separate extension target (kind: "share" in plan extensions array).
The extension receives shared content (URLs, text, images) from other apps via the share sheet.

PRINCIPAL CLASS (in extension target):
class ShareViewController: SLComposeServiceViewController {
    override func isContentValid() -> Bool {
        return contentText.count > 0    // Validate before enabling Post button
    }

    override func didSelectPost() {
        // Access shared items
        guard let item = extensionContext?.inputItems.first as? NSExtensionItem,
              let provider = item.attachments?.first else {
            extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
            return
        }

        if provider.hasItemConformingToTypeIdentifier("public.url") {
            provider.loadItem(forTypeIdentifier: "public.url") { [weak self] url, _ in
                // Handle URL
                self?.extensionContext?.completeRequest(returningItems: [], completionHandler: nil)
            }
        }
    }

    override func configurationItems() -> [Any]! {
        return []    // Return SLComposeSheetConfigurationItem array for optional UI
    }
}

INFO.PLIST KEYS (in extension's Info.plist via XcodeGen):
NSExtensionPrincipalClass: $(PRODUCT_MODULE_NAME).ShareViewController
NSExtensionActivationRule:
  NSExtensionActivationSupportsWebURLWithMaxCount: 1
  NSExtensionActivationSupportsText: true

APP GROUP: Use AppGroup entitlement to share data between main app and extension.