Question

I want to check something every time there is a new session in an iOS application.

Neither -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ nor -(void)applicationDidBecomeActive:(UIApplication *)application{ are achieving what I want here.

What do you recommend to achieve what I want? I want to keep multitasking…

Answer 1

You can add your object as an observer for the UIApplicationWillEnterForegroundNotification notfication (or related notifications) in order for it to perform some check whenever the app enters the foreground. Using this code, you can associate the notification with a block:

[[NSNotificationCenter defaultCenter] 
                       addObserverForName:UIApplicationWillEnterForegroundNotification 
                                   object:nil 
                                    queue:nil 
                               usingBlock:^(NSNotification *notification) {
                                  // Whatever check is needed
                               }];

You are not restricted to doing all that work in your app delegate.