Add a dummy extension

passextension/ActionViewController.swift

@@ -0,0 +1,47 @@
+//
+//  ActionViewController.swift
+//  passforiosextension
+//
+//  Created by Yishi Lin on 9/6/17.
+//  Copyright © 2017 Yishi Lin. All rights reserved.
+//
+
+import UIKit
+import MobileCoreServices
+
+class ActionViewController: UIViewController {
+
+    @IBOutlet weak var textView: UITextView!
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        
+        let item = extensionContext?.inputItems.first as! NSExtensionItem
+        let provider = item.attachments?.first as! NSItemProvider
+        let propertyList = String(kUTTypePropertyList)
+        if provider.hasItemConformingToTypeIdentifier(propertyList) {
+            provider.loadItem(forTypeIdentifier: propertyList, options: nil, completionHandler: { (item, error) -> Void in
+                let dictionary = item as! NSDictionary
+                let results = dictionary[NSExtensionJavaScriptPreprocessingResultsKey] as! NSDictionary
+                let url = results["url"] as? String
+                DispatchQueue.main.async { [weak self] in
+                    self?.textView.text = url
+                }
+            })
+        } else {
+            print("error")
+        }
+    }
+
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+
+    @IBAction func done() {
+        // Return any edited content to the host app.
+        // This template doesn't do anything, so we just echo the passed in items.
+        self.extensionContext!.completeRequest(returningItems: self.extensionContext!.inputItems, completionHandler: nil)
+    }
+
+}