----- Original Message ----
> From: DKJ <[EMAIL PROTECTED]>
>
> When I did this:
>
> myLayer.frame.size.width = rootLayer.frame.size.width;
>
> I got an "illegal lvalue" error. But when I do this:
>
> CGRect r = help.frame;
> r.size.width = rootLayer.frame.size.width;
>
> the compiler says nothing. Why can I use layer.frame.size on the right
> of =, but not the left?
You can't assign to the return value of a function or method. I think the dot
syntax is confusing you because it looks the same between structs and object
properties even though it does completely different things. The (myLayer.frame)
part calls [myLayer frame], which returns an NSRect value. At that point, you
have an NSRect value sitting outside of any variable, so you can't assign to
it. What you're doing is similar to writing this:
[[NSObject alloc] init] = [NSString stringWithString:@"Hello world"];
Does that make more sense?
Cheers,
Chuck
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