Question

I’m getting a compiler warning when using the following code:

for(int i=0; i<[mutableTempArray count]; i++){
  //...
  [tempInfoDictionary setValue:i forKey:@"tag"];
  //...
}

The warning is:

passing argument 1 of ‘setValue:forKey:’ makes pointer from integer without a cast

What am I doing wrong here?

Answer 1

Collections in Objective-C can only hold objects, so you’ll need to wrap i in an NSNumber object.

i itself is a primitive type, not an object, so it can’t be put inside a collection object.

The first argument to setValue:forKey: is expected to be of pointer type, which i itself clearly isn’t.

I suggest using the setObject:forKey: method on an NSDictionary instead of setValue:forKey:, because it states your intentions better. You’re not only storing a value, you’re storing an object

[tempInfoDictionary setObject:[NSNumber numberWithInt:i] forKey:@"tag"];