iOS: didSelectPost() processing for share extension

didSelectPost.swift

override func didSelectPost() {

    // content of the post
    print(#function, #line, self.contentText ?? "NO CONTENT")

    // extract URL from attachments
    if let item = extensionContext?.inputItems.first as? NSExtensionItem,
       let itemProvider = item.attachments?.first as? NSItemProvider,
       itemProvider.hasItemConformingToTypeIdentifier("public.url") {
    
       itemProvider.loadItem(forTypeIdentifier: "public.url", options: nil) {
            url, error in
        
            if let error = error {
                print(#function, #line, error)
                return
            }

            if let shareURL = url as? NSURL {
                print(shareURL)
            }
            
            self.extensionContext?.completeRequest(returningItems: [], completionHandler:nil)
        }
    }
}