Question

What do you all recommend as the best location in an iphone project to dump data collected from the user to a local file? Would you say that applicationWillTerminate is a good option?

Thanks!

Answer 1

A better option on iOS 4.x is applicationDidEnterBackground:

Indeed, according to Apple docs, an application in the background can be terminated at any time due to low memory conditions. Therefore, the suggestion is making persistent any state information at the moment the app enters background.

An excerpt from the UIApplicationDelegate protocol:

You should use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. You should also disable updates to your application’s user interface and avoid using some types of shared system resources (such as the user’s contacts database). It is also imperative that you avoid using OpenGL ES in the background.

Your implementation of this method has approximately five seconds to perform any tasks and return. If you need additional time…