How to increment a NSNumber

Question

How do I increment a NSNumber?

i.e. myNSNumber++

Answer 1

Lots of good info in the answers to this question. I used the selected answer in my code and it worked. Then I started reading the rest of the posts and simplified the code a lot. It’s a bit harder to read if you aren’t familiar with the changes in notation that were introduced in Xcode 5, but it’s a lot cleaner. I probably could make it just one line, but then it’s a little too hard to figure out what I’m doing.

I’m storing an NSNumber in a dictionary and I want to increment it. I get it, convert it to an int, increment it while converting it to an NSNumber, then put it back into the dictionary.

Old Code

 NSNumber *correct = [scoringDictionary objectForKey:@"correct"];
 int correctValue = [correct intValue];
 correct = [NSNumber numberWithInt:correctValue + 1];
 [scoringDictionary removeObjectForKey:@"correct"];
 scoringDictionary[@"correct"] = correct;

New code

NSNumber *correct = [scoringDictionary objectForKey:@"correct"];
scoringDictionary[@"correct"] = @(correct.intValue + 1);