From Apple docs: For applications that do not support background execution or are linked against iOS 3.x or earlier, this method is always called when the user quits the application. For applications that support background execution, this method is generally not called when the user quits the application because the application simply moves to the … Read more
This code was executed before [window makeKeyAndVisible]; which is inside the app delegate. So, no wonder why keyWindow was nil yet.
It’s not a good strategy to turn your AppDelegate into a “big ball of mud” that contains a million methods and properties (although it might be tempting). A better and more object oriented approach to section off bits of functionality into well-designed objects — for example you might have a class DatabaseManager which handles all … Read more
Ok I figured it out. The method is actually called twice (once when it receives the push, and once when the user interacts with the icon or the notification). – (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler { if(application.applicationState == UIApplicationStateInactive) { NSLog(@”Inactive”); //Show the view with the content of the push completionHandler(UIBackgroundFetchResultNewData); } else if … Read more
In Cocoa, a delegate is an object that another object defers to on questions of behavior and informs about changes in its state. For instance, a UITableViewDelegate is responsible for answering questions about how the UITableView should behave when selections are made or rows are reordered. It is the object that the UITableView asks when … Read more
Since I asked this question, I have done a fair bit of testing (mostly on the train between home and work) and have confirmed that the behaviour for suspended apps is as I suspected at the end of the question. That is, your suspended app is woken up, you don’t receive any callbacks on your … Read more
From the iPhone Application Programming Guide: Even if you develop your application using iPhone SDK 4 and later, you must still be prepared for your application to be terminated. If memory becomes constrained, the system might remove applications from memory in order to make more room. If your application is currently suspended, the system removes … Read more
A delegate is a pointer to an object with a set of methods the delegate-holder knows how to call. In other words, it’s a mechanism to enable specific callbacks from a later-created object. A good example is UIAlertView. You create a UIAlertView object to show a short message box to users, possibly giving them a … Read more
Applications can create a local notification at a “future” date and time which could be used to notify the user that the application was terminated. If they then tap the application they can then restart your app. This is working in my app that uses/requires Bluetooth Central in the info.plist (so it will run in … Read more
If you search for pausesLocationUpdatesAutomatically on the Apple forums you’ll find a recent question along similar lines which has had a response from an Apple developer. I won’t repost it directly here since it is a private forum, but the gist is that the location pausing is for instances when the user forgets that they … Read more