Objective C Boolean Array

user_57414 0
Viewed 41935

I need to utilize an array of booleans in objective-c. I've got it mostly set up, but the compiler throws a warning at the following statement:

[updated_users replaceObjectAtIndex:index withObject:YES];

This is, I'm sure, because YES is simply not an object; it's a primitive. Regardless, I need to do this, and would greatly appreciate advice on how to accomplish it.

Thanks.

primitive objective-c boolean c arrays
6 Answers

Yep, that's exactly what it is: the NS* containers can only store objective-C objects, not primitive types.

You should be able to accomplish what you want by wrapping it up in an NSNumber:

[updated_users replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:YES]]

or by using @(YES) which wraps a BOOL in an NSNumber

[updated_users replaceObjectAtIndex:index withObject:@(YES)]]

You can then pull out the boolValue:

BOOL mine = [[updated_users objectAtIndex:index] boolValue];

user_24046640

Assuming your array contains valid objects (and is not a c-style array):

#define kNSTrue         ((id) kCFBooleanTrue)
#define kNSFalse        ((id) kCFBooleanFalse)
#define NSBool(x)       ((x) ? kNSTrue : kNSFalse)

[updated_users replaceObjectAtIndex:index withObject:NSBool(YES)];
user_10430

You can either store NSNumbers:

[updated_users replaceObjectAtIndex:index
                         withObject:[NSNumber numberWithBool:YES]];

or use a C-array, depending on your needs:

BOOL array[100];
array[31] = YES;
user_245870

If your collection is large or you want it to be faster than objc objects, try the CFBitVector/CFMutableBitVector types found in CoreFoundation. It's one of the CF-Collections types which does not ship with a NS counterpart, but it can be wrapped in an objc class quickly, if desired.

user_1915960
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