Question

I have a NSTimer that I am stopping when my application resigns active, which I later restart when the application again becomes active. What I did not realise was that applicationWillResignActive would fire when my application first started (pretty obvious really). So what is happening is my NSTimer is incorrectly starting (when the application first starts). My question is, is there a way to check for the application resuming from inactive as apposed to it first starting?

- (void)applicationWillResignActive:(UIApplication *)application {
    // STOP CORE TIMER
    [[[self mapController] coreTimer] invalidate];
    [[self mapController] setCoreTimer:nil];
}

.

- (void)applicationDidBecomeActive:(UIApplication *)application {
    // START CORE TIMER
    [[self mapController] setCoreTimer:[NSTimer 
        scheduledTimerWithTimeInterval:ONE_SECOND 
                                target:[self mapController]   
                              selector:@selector(timerDisplay:) 
                              userInfo:nil 
                               repeats:YES]];
}

Answer 1

There is the applicationWillEnterForeground which seems to only fire when the app comes back from the background. Just tested it, won’t be called on launch.

Discussion

In iOS 4.0 and later, this method is
called as part of the transition from
the background to the active state.
You can use this method to undo many
of the changes you made to your
application upon entering the
background. The call to this method is
invariably followed by a call to the
applicationDidBecomeActive: method,
which then moves the application from
the inactive to the active state.