Objective C Boolean Array
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];
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)];
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;