gistfile1.rb

class NSResponder

  def acceptsFirstResponder= val
    (@acceptsFirstResponder = val).tap do
      instance_eval do
        def acceptsFirstResponder
          @acceptsFirstResponder
        end
        self
      end
    end
  end

end

NSTextField.alloc.initWithFrame(...).tap {|tf|
    tf.acceptsFirstResponder = false
  }

This seems really hacky but I couldn't find a method like:

NSTextField.alloc.initWithFrame(...).tap {|tf|
  tf.acceptsFirstResponder = false
}