[Swift] iOS の共有メニューに追加できるアプリを作る(その ２：HostAppからデータを受け取るまで)

    override func didSelectPost() {
        // This is called after the user selects Post. Do the upload of contentText and/or NSExtensionContext attachments.
        let checkItems = self.extensionContext?.inputItems　　// ⬅︎ 
    
        // Inform the host that we're done, so it un-blocks its UI. Note: Alternatively you could call super's -didSelectPost, which will similarly complete the extension context.
        self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
    }

    override func didSelectPost() {
        // This is called after the user selects Post. Do the upload of contentText and/or NSExtensionContext attachments.
        guard let checkItems = self.extensionContext?.inputItems else { return }
    
        guard let extensionItem = checkItems[0] as? NSExtensionItem else { return }
        guard let firstItem = extensionItem.attachments?.first! else { return }
        if firstItem.hasItemConformingToTypeIdentifier(String(kUTTypeJPEG)) {
            firstItem.loadItem(forTypeIdentifier: String(kUTTypeJPEG), options: nil) { (item, error) in
                // process item as it is a path to jpeg file
                print("\(item)")
            }
            // Inform the host that we're done, so it un-blocks its UI. Note: Alternatively you could call super's -didSelectPost, which will similarly complete the extension context.
            self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
        }
    }