objective-c - How to add a number to an integer

Question

I am trying to make a NSInteger being abel to contain a number while the app is runing and that I can add numbers to that NSInteger hers my code

// in the .h
NSInteger *count;
// in the .m
count = 0;

Then I save count in NSUserDefaults like so

[[NSUserDefaults standardUserDefaults] setInteger:count forKey:@"key"];
[[NSUserDefaults standardUserDefaults] synchronize]; 

In the next view after calling NSUserDefaults I do this

count + 4;

The problem is that in the end I always get zero.

Answer 1

NSInteger is a primitive type, not an object type. So you don't want to use a pointer to NSInteger, but directly NSInteger:

// in the .h
NSInteger count;
// in the .m
count = 0;

And to increase it:

count += 4;