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    <p>You need to read the guide on how to run tasks in the background:</p> <p><a href="http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW20">Background Execution and Multitasking</a></p> <p>Here is my applicationDidEnterBackground for one of my apps. When I put it to the background, it does some disk cache maintenance:</p> <pre><code>- (void)applicationDidEnterBackground:(UIApplication *)application { //As we are going into the background, I want to start a background task to clean up the disk caches if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) { //Check if our iOS version supports multitasking I.E iOS 4 if ([[UIDevice currentDevice] isMultitaskingSupported]) { //Check if device supports mulitasking UIApplication *application = [UIApplication sharedApplication]; //Get the shared application instance __block UIBackgroundTaskIdentifier background_task; //Create a task object background_task = [application beginBackgroundTaskWithExpirationHandler: ^{ [application endBackgroundTask:background_task]; //Tell the system that we are done with the tasks background_task = UIBackgroundTaskInvalid; //Set the task to be invalid //System will be shutting down the app at any point in time now }]; //Background tasks require you to use asyncrous tasks dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ //Perform your tasks that your application requires //I do what i need to do here.... synchronously... [application endBackgroundTask: background_task]; //End the task so the system knows that you are done with what you need to perform background_task = UIBackgroundTaskInvalid; //Invalidate the background_task }); } } </code></pre> <p>}</p>
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    1. COWith this part of code, methods are called. It work fine, but could I distribute it ?
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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