Hello I am working on a project and I am trying to add an NSUInteger to an NSMutableArray. I am new to Objective-C and C in general. When I run the app NSLog displays null.
I'd appreciate any help anyone is able to provide.
Here is my code
-(NSMutableArray *)flipCardAtIndex:(NSUInteger)index
{
Card *card = [self cardAtIndex:index];
[self.flipCardIndexes addObject:index];
if(!card.isUnplayable)
{
if(!card.isFaceUp)
{
for(Card *otherCard in self.cards)
{
if(otherCard.isFaceUp && !otherCard.isUnplayable)
{
int matchScore = [card match:@[otherCard]];
if(matchScore)
{
otherCard.unplayable = YES;
card.unplayable = YES;
self.score += matchScore * MATCH_BONUS;
}
else
{
otherCard.faceUp = NO;
self.score -=MISMATCH_PENALTY;
}
break;
}
}
self.score -=FLIP_COST;
}
card.faceUp = !card.isFaceUp;
}
NSLog(@"%@",self.flipCardIndexes[self.flipCardIndexes.count-1]);
return self.flipCardIndexes;
}
NSArray
(along with its subclassNSMutableArray
) only supports objects, you cannot add native values to it.Check out the signature of
-addObject:
As you can see it expects
id
as argument, which roughly means any object.So you have to wrap your integer in a
NSNumber
instance as followswhere
@(index)
is syntactic sugar for[NSNumber numberWithInt:index]
.Then, in order to convert it back to
NSUInteger
when extracting it from the array, you have to "unwrap" it as follows