Improve Errata process + fixes for Handling Location Changes in the Background

.gitignore

@@ -0,0 +1,3 @@
+
+# Xcode user settings
+**/xcuserdata/

README.md

@@ -13,6 +13,9 @@ http://shop.oreilly.com/product/0636920034254.do
 
 If you have any questions, you can contact me directly
 at vandad.np@gmail.com
-Similarly, if you find an error in these sample codes, simply
-report them to O'Reilly at the following URL:
+
+If you find an error in these code samples, please fork the Github
+repository and submit a pull request with the improvements.
+
+You can also report errors on the O’Reilly website:
 http://www.oreilly.com/catalog/errata.csp?isbn=0636920034254

chapter-concurrency/Handling Location Changes in the Background/Handling Location Changes in the Background/AppDelegate.swift

@@ -26,33 +26,47 @@ import CoreLocation
 
 @UIApplicationMain
 class AppDelegate: UIResponder, UIApplicationDelegate,
+// The following is the protocol for location updates
 CLLocationManagerDelegate {
 
   var window: UIWindow?
   var locationManager: CLLocationManager! = nil
   var isExecutingInBackground = false
 
-func locationManager(manager: CLLocationManager!,
-  didUpdateToLocation newLocation: CLLocation!,
-  fromLocation oldLocation: CLLocation!){
-    if isExecutingInBackground{
+  // LocationManager will call this handler for all location updates
+  func locationManager(manager: CLLocationManager!,
+    didUpdateToLocation newLocation: CLLocation!,
+    fromLocation oldLocation: CLLocation!) {
+
+    if (newLocation != nil) {
+      println("New Location: \(newLocation.coordinate.latitude), \(newLocation.coordinate.longitude)")
+    }
+    if isExecutingInBackground {
       /* We are in the background. Do not do any heavy processing */
     } else {
       /* We are in the foreground. Do any processing that you wish */
     }
-}
+  }
 
   func application(application: UIApplication,
-    didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
+    didFinishLaunchingWithOptions
+    launchOptions: NSDictionary?) -> Bool {
+
     locationManager = CLLocationManager()
     locationManager.desiredAccuracy = kCLLocationAccuracyBest
+
+    // Uses CLLocationManagerDelegate protocol
     locationManager.delegate = self
+
+    // Asks user for app permission to receive background location changes
+    locationManager.requestAlwaysAuthorization()
+
+    // This can be called immediately but not updates will not
+    // be received until the user has approved access
     locationManager.startUpdatingLocation()
     return true
   }
 
-
-
   func applicationDidEnterBackground(application: UIApplication) {
     isExecutingInBackground = true
 
@@ -68,11 +82,5 @@ func locationManager(manager: CLLocationManager!,
     detection accuracy */
     locationManager.desiredAccuracy = kCLLocationAccuracyBest
   }
-
-
-
-
-
-
 }
 

chapter-concurrency/Handling Location Changes in the Background/Handling Location Changes in the Background/Info.plist

@@ -4,6 +4,8 @@
 <dict>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
+	<key>NSLocationAlwaysUsageDescription</key>
+	<string>&lt;Message to explain why app needs always on location&gt;</string>
 	<key>CFBundleExecutable</key>
 	<string>${EXECUTABLE_NAME}</string>
 	<key>CFBundleIdentifier</key>