setIntercellSpacing: error

How do you use this method properly, I get "Conversion to non-scalar type requested" upon compile. When executing the method like so: [tableView setIntercellSpacing:(NSSize)(4.0, 5.0)];开发者_开发百科

Any Ideas? thanks.

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Oh wait, got it.

This is how you do it: [tableView setIntercellSpacing:NSMakeSize(2.0, 5.0)];