NSNotificationCenter ApplicationDidBecomeActive

applicationActivationCount

NSNotificationCenter* notificationCenter = [NSNotificationCenter defaultCenter];
    
    [notificationCenter addObserverForName:UIApplicationDidBecomeActiveNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
        NSInteger count = [APPLICATION_COUNT_VALUE integerValue];
        count++;
        [self.textLabel setText:[NSString stringWithFormat:@"%i", count]];
    }];