Question

In my aplication, I have an nsmutablearray which stores a number of types of objects. All these objects are having two similar properties: id, type.

What I’m doing is I’m fetching the current working object in a 1-element array and accessing its properties id, type from within another class. This class is not aware which type of an object is the current object. How shall I access this object?

I tried doing:

commentId = [[appDelegate.currentDeailedObject valueForKey:@"id"] intValue];
commentType = [appDelegate.currentDeailedObject valueForKey:@"type"];

But it didn’t work.

I created an object of type id like this:

id *anObject = [appDelegate.currentDeailedObject objectAtIndex:0];
commentId = [[anObject valueForKey:@"id"] intValue];
commentType = [anObject valueForKey:@"type"];

But it shows me 2 warnings:
1.warning: initialization from incompatible pointer type

2.warning: invalid receiver type ‘id*’

How shall I make this work?

Thanx in advance.

Answer 1

Generic id variables do not generally take a pointer assignment, because it is already a pointer. So you should use something like:

id anObject = [appDelegate.currentDeailedObject objectAtIndex:0];

You may want to use casts for commentId and commentType, e.g. (NSNumber *), etc.