Question

I’m having trouble with this code:

NSRect itemFrame; id item; // code to assign item goes here. itemFrame.origin.y -= [item respondsToSelector:@selector(selectedHeight)] ? [item selectedHeight]   : [self defaultSelectedHeight]; 

This is the problematic bit:

[item selectedHeight] 

The compiler is assuming that the return type is id. I though that adding a cast would fix this:

(float)[item selectedHeight] 

but it doesn’t work.

What am I doing wrong? (I suspect the problem is to do with resolving pointers related to id but I can’t find any relevant documentation).

Answer 1

you want [[item selectedHeight] floatValue], assuming that the selectedHeight returns an NSNumber.