Add NSIntegers ONLY when 2nd NSInteger Changes Value

Question

I realize that a for-loop would likely be the best way to do this, I just don't know the proper way to say for every 5 obstacles passed, add 1 to the totalScriptures integer

I have an app similar to flappy bird. An object passes between two vertical objects with the user tapping to keep it a float.

The scoring method is slightly different, so I will do my best to explain it. In the app, the user collects 'scriptures' by passing through the obstacles. For every 5 obstacles passed, the user earns 1. So in my scoring method I first divide by 2 (to account for passing between two obstacles), and then divide by 5 to figure out how many scriptures have been earned.

I am also trying to keep track of the total number of scriptures earned. I do this by creating an NSUserDefault Integer that starts at 0. What I am attempting to do is to divide by 2 to get the number of obstacles passed, then divide by 5 to get how many scriptures have been earned, and add that number to the NSUserDefault I mentioned earlier. However, with the code you are about to see, once a scripture is earned, it maintains that value, and so for the first 5 obstacles, all is well, but once one scripture is earned, it adds a scripture to the default every single time. Can someone advise me on how to only perform the addition if the finalChange number is different than the last report?

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
                 NSInteger startIt = [defaults integerForKey:@"totalScripturesCollected"];
                 NSInteger goBetween = _score/2;
                 NSInteger finalChange = goBetween/5;
                 NSInteger toReport = startIt + finalChange;

                 [defaults setInteger:_score/2 forKey:@"theScore"];
                 [defaults setInteger:toReport forKey:@"totalScripturesCollected"];
                 [defaults synchronize];
                 NSLog(@"startit %ld", (long)startIt);
                 NSLog(@"gobetween %ld", (long)goBetween);
                 NSLog(@"finalchange %ld", (long)finalChange);
                 NSLog(@"toreport %ld", (long)toReport);

Answer 1

I would say that you should do this calculation only once at the end of a game.

If you need to show the calculation result all the time, you can add a class variable to keep count. And in each run of that code do:

count++;
if (count == 10) {
    NSInteger toReport = startIt++;
    [defaults setInteger:toReport forKey:@"totalScripturesCollected"];
    [defaults synchronize];
    count = 0;
} 

So each 10 obstacles passed, you add one scripture, and then you start counting again.