Check if int is nil in Obj-C

Question

I know in C int cannot be nil, which brings me to ask this question. I am using a rails API that uses an int for a certain property (rating). This API call could return nothing for the rating because it doesn't have a rating yet. I am using RestKit to map the results of the API call.

Maybe I should convert the int passed back from server API call to an NSNumber instead of an int? Or can I check in int is nil some how?

You tagged "Objective-C" and you say you use Rails. Am I missing something? Also, I believe Obj-C is defined as a "strict superset of C". — Arc676
– Arc676, Commented Nov 10, 2015 at 15:09
int cannot be nil in Obj-C. Only object types (pointer) can be nil (null). If you want to have a way to handle nil, you need to use objects (e.g. NSNumber). This is what most parsing frameworks do. — Sulthan
– Sulthan, Commented Nov 10, 2015 at 15:10

Leo · Accepted Answer · 2015-11-10 15:16:54Z

4

You should use NSNumber, which is an object and can therefore be nil. It can wrap integers, floating points and booleans:

NSNumber *number = nil;
if (!number) {
    NSLog(@"Number not assigned");
}

number = @1;
if (number) {
    NSLog(@"Number assigned: %d", [number intValue]);
}

edited Nov 10, 2015 at 15:16

Leo

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answered Nov 10, 2015 at 15:11

trojanfoe

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