In iOS, we all know that there is AppDelegate method applicationWillTerminate, and it is called when my app is closed by user when it is currently running(i.e. not in background). But I want to do something(save data, for example) when my app is terminated(closed by user or killed by OS) when it runs in background.
PS: my app can run in background.
Do you have any solutions? thanks.
Sorry but you should use applicationWillTerminate:
This method lets your app know that it is about to be terminated and purged from memory entirely. You should use this method to perform any final clean-up tasks for your app, such as freeing shared resources, saving user data, and invalidating timers. Your implementation of this method has approximately five seconds to perform any tasks and return. If the method does not return before time expires, the system may kill the process altogether.
For apps 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 app. For apps that support background execution, this method is generally not called when the user quits the app because the app simply moves to the background in that case. However, this method may be called in situations where the app is running in the background (not suspended) and the system needs to terminate it for some reason.
So if you need to save data ALSO when user manually kill the app use applicationDidEnterBackground that it's called if your app support background mode.