You are on the right track. This is Apple’s recommended way to do this as noted in the iOS Application Programming Guide: Remove sensitive information from views before moving to the background. When an application transitions to the background, the system takes a snapshot of the application’s main window, which it then presents briefly when … Read more
Tasks can be used to represent operations taking place on multiple threads, but they don’t have to. One can write complex TPL applications that only ever execute in a single thread. When you have a task that, for example, represents a network request for some data, that task is not going to create additional threads … Read more
Playing Background Audio An app that plays or records audio continuously (even while the app is running in the background) can register to perform those tasks in the background. You enable audio support from the Background modes section of the Capabilities tab in your Xcode project. (You can also enable this support by including the … Read more
If you want your network transaction to continue in the background, then you’ll need to wrap it in a background task. It’s also very important that you call endBackgroundTask when you’re finished – otherwise the app will be killed after its allotted time has expired. Mine tend look something like this: – (void) doUpdate { … Read more
You are doing it correctly. 🙂 Try running this silly piece of code: from multiprocessing import Process import sys rocket = 0 def func1(): global rocket print ‘start func1’ while rocket < sys.maxint: rocket += 1 print ‘end func1’ def func2(): global rocket print ‘start func2’ while rocket < sys.maxint: rocket += 1 print ‘end … Read more
From the Application Fundamentals page of the Android dev guide: By default, all the activities in an application have an affinity for each other — that is, there’s a preference for them all to belong to the same task. A “singleInstance” activity stands alone as the only activity in its task. If it starts another … Read more
Any class in your application can become an “observer” for different notifications in the application. When you create (or load) your view controller, you’ll want to register it as an observer for the UIApplicationDidBecomeActiveNotification and specify which method that you want to call when that notification gets sent to your application. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(someMethod:) … Read more
I have seen this behavior, too. After trying a lot I discovered two things, which could help. But I am still uncertain how this may influence the reviewing process. If you use one of the backgrounding features, the app will be launched by iOS in background again once it was quit (by the system). This … Read more