Question

I am working through the Stanford iPhone class and I can’t figure out why I am getting a compiler warning. I assume I need to cast my object to NSString, but I get an error when I try to do so. The code runs and gives me the expected output, but the warning bothers me.

NSLog(@'lowerCaseString is: %@', [object lowercaseString]); 

This runs with the warning: ‘NSObject’ may not respond to ‘-lowerCaseString’

NSLog(@'lowerCaseString is: %@', [(NSString)object lowercaseString]); 

This throws an error: conversion to non-scalar type requested

Answer 1

I believe this will do what you need:

NSLog(@'lowerCaseString is: %@', [(NSString *)object lowercaseString]); 

Note I just added a * to your second line of code to make a pointer to NSString.