Question

Why am I still allowed to use functions and create objects from the NSObject class when I didn’t import it?

int main (int argc, char *argv[])  
{  
    @autoreleasepool {  
        NSLog(@"hi");
        NSArray *array = [NSArray arrayWithObject: @"hello"];
        NSLog(@"%@", array);
    }
    return 0;  
} 

Output

2012-08-11 22:15:33.854 prog[1282:403] hi
2012-08-11 22:15:33.857 prog[1282:403] (
    hello
)

Answer 1

Most likely you have a Precompiled/Prefix header that imports Foundation, So Foundation gets implicitly added to each header. Look for a file called *-Prefix.pch. Xcode normally puts it in a group called Supporting Files.