From c7b055ee718d66f7c39f4f03d5f440c5bdcb428f Mon Sep 17 00:00:00 2001
From: Sam Davies <sdavies@shinobicontrols.com>
Date: Mon, 24 Nov 2014 14:41:31 +0000
Subject: [PATCH] Wired the activity continuation code in, it all works
 spiffingly well

The region is extracted from the activity and the map updated to display
it as appropriate.

Ready for writeup
---
 38-handoff/MapOff/MapOff/AppDelegate.swift    |  4 +++-
 38-handoff/MapOff/MapOff/ViewController.swift | 16 +++++++++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/38-handoff/MapOff/MapOff/AppDelegate.swift b/38-handoff/MapOff/MapOff/AppDelegate.swift
index 5672724..009f131 100644
--- a/38-handoff/MapOff/MapOff/AppDelegate.swift
+++ b/38-handoff/MapOff/MapOff/AppDelegate.swift
@@ -32,7 +32,9 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
   }
   
   func application(application: UIApplication, continueUserActivity userActivity: NSUserActivity, restorationHandler: ([AnyObject]!) -> Void) -> Bool {
-    println("Continuing...")
+    if let rootVC = window?.rootViewController {
+      restorationHandler([rootVC])
+    }
     return true
   }
 
diff --git a/38-handoff/MapOff/MapOff/ViewController.swift b/38-handoff/MapOff/MapOff/ViewController.swift
index 303e282..f71968a 100644
--- a/38-handoff/MapOff/MapOff/ViewController.swift
+++ b/38-handoff/MapOff/MapOff/ViewController.swift
@@ -20,11 +20,12 @@ import MapKit
 class ViewController: UIViewController, MKMapViewDelegate {
 
   @IBOutlet weak var mapView: MKMapView!
+  let activityType = "com.shinobicontrols.MapOff.viewport"
   
   override func viewDidLoad() {
     super.viewDidLoad()
     // Do any additional setup after loading the view, typically from a nib.
-    let activityType = "com.shinobicontrols.MapOff.viewport"
+    
     if userActivity?.activityType != activityType {
       userActivity?.invalidate()
       userActivity = NSUserActivity(activityType: activityType)
@@ -34,11 +35,24 @@ class ViewController: UIViewController, MKMapViewDelegate {
     mapView.delegate = self
   }
   
+  // MARK:- UIResponder Activity Handling
   override func updateUserActivityState(activity: NSUserActivity) {
     let regionData = NSData(bytes: &mapView.region, length: sizeof(MKCoordinateRegion))
     activity.userInfo = ["region" : regionData]
   }
   
+  override func restoreUserActivityState(activity: NSUserActivity) {
+    if activity.activityType == activityType {
+      // Extract the data
+      let regionData = activity.userInfo!["region"] as NSData
+      // Need an empty coordinate region to populate
+      var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0),
+                                        span: MKCoordinateSpan(latitudeDelta: 0.0, longitudeDelta: 0.0))
+      regionData.getBytes(&region, length: sizeof(MKCoordinateRegion))
+      mapView.setRegion(region, animated: true)
+    }
+  }
+  
   // MARK:- MKMapViewDelegate
   func mapView(mapView: MKMapView!, regionDidChangeAnimated animated: Bool) {
     userActivity?.needsSave = true