Handle backgrounding properly with expiration handler

BackgroundExecution/AppDelegate.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -57,11 +57,15 @@ namespace BackgroundExecution
 		{
 			Console.WriteLine ("App entering background state.");
 
+			nint taskID = 0;
 			// if you're creating a VOIP application, this is how you set the keep alive
 			//UIApplication.SharedApplication.SetKeepAliveTimout(600, () => { /* keep alive handler code*/ });
 
 			// register a long running task, and then start it on a new thread so that this method can return
-			var taskID = UIApplication.SharedApplication.BeginBackgroundTask (null);
+			taskID = UIApplication.SharedApplication.BeginBackgroundTask (()=>{
+				Console.WriteLine("Running out of time to complete you background task!");
+				UIApplication.SharedApplication.EndBackgroundTask(taskID);
+			});
 			Task.Factory.StartNew (() => FinishLongRunningTask (taskID));
 		}
 

BackgroundExecution/Screens/HomeScreen.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
@@ -11,6 +11,7 @@ namespace BackgroundExecution
 {
 	public partial class HomeScreen : UIViewController
 	{
+
 		#region Constructors
 
 		// The IntPtr and initWithCoder constructors are required for items that need
@@ -44,8 +45,13 @@ namespace BackgroundExecution
 
 		void DoSomething ()
 		{
+			nint taskID = 0;
 			// register our background task
-			var taskID = UIApplication.SharedApplication.BeginBackgroundTask (BackgroundTaskExpiring);
+			taskID = UIApplication.SharedApplication.BeginBackgroundTask(() =>
+			{
+				Console.WriteLine("Running out of time to complete you background task!");
+				UIApplication.SharedApplication.EndBackgroundTask(taskID);
+			});
 
 			Console.WriteLine ("Starting background task {0}", taskID);
 
@@ -58,10 +64,6 @@ namespace BackgroundExecution
 			UIApplication.SharedApplication.EndBackgroundTask (taskID);
 		}
 
-		public void BackgroundTaskExpiring ()
-		{
-			Console.WriteLine ("Running out of time to complete you background task!");
-		}
 	}
 }
 

QRchestra/QRchestra/SessionManager.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using AVFoundation;
 using Foundation;
 using System.Collections.Generic;
@@ -173,6 +173,7 @@ namespace QRchestra
 		{
 			pipelineRunningTask = UIApplication.SharedApplication.BeginBackgroundTask (delegate {
 				Console.WriteLine ("Video capture pipeline background task expired");
+				UIApplication.SharedApplication.EndBackgroundTask(pipelineRunningTask);
 			});
 		}
 

RosyWriter/RosyWriterViewControllerUniversal.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using CoreGraphics;
 
 using Foundation;
@@ -167,7 +167,9 @@ namespace RosyWriter
 				// Make sure we have time to finish saving the movie if the app is backgrounded during recording
 				if (UIDevice.CurrentDevice.IsMultitaskingSupported)
 					// HACK: Cast nint to int
-					backgroundRecordingID = (int)UIApplication.SharedApplication.BeginBackgroundTask (() => {});
+					backgroundRecordingID = (int)UIApplication.SharedApplication.BeginBackgroundTask (() => {
+					UIApplication.SharedApplication.EndBackgroundTask(backgroundRecordingID);
+				});
 			});
 		}