Saving some data from applicationDidEnterBackground method

Saving some data from applicationDidEnterBackground method.txt

Put the code in the class that actually has the data. Have the class register for the UIApplicationDidEnterBackgroundNotification notification.

// Put this in the `init` method
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(backgrounding) name:UIApplicationDidEnterBackgroundNotification object:nil];

// The method that gets called
- (void)backgrounding {
    // save the data
}

// Put this in the `dealloc` method
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidEnterBackgroundNotification object:nil];
With this setup you don't have to get anything into the UIApplicationDelegate and the responsibility is kept where it belongs.