What is the correct way to save NSUserDefaults when my app is terminated on iOS

Question

I need to save my NSUserDefault when my app is completely quit in iOS. not didenterbackground and foreground. Only when user kill my app w

Answer 1

The problem is that applicationWillTerminate is not getting called at all.

Change your applicationDidEnterBackground as below and kill your application within 20 seconds. You can see applicationWillTerminate getting called & setting your iCloud value properly in NSUserDefaults

- (void)applicationDidEnterBackground:(UIApplication *)application
{

    __block UIBackgroundTaskIdentifier identifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
        if (identifier != UIBackgroundTaskInvalid) {
            [[UIApplication sharedApplication] endBackgroundTask:identifier];
            identifier = UIBackgroundTaskInvalid;
        }
    }];

    dispatch_async(dispatch_get_main_queue(), ^{
        for (int i=0; i < 20; i++) {
            NSLog(@"%d", i);
            sleep(1);
        }
        if (identifier != UIBackgroundTaskInvalid) {
            [[UIApplication sharedApplication] endBackgroundTask:identifier];
            identifier = UIBackgroundTaskInvalid;
        }
    });
}