NSGradient.alloc.initWithColorsAndLocations -- RubyMotion (OS X)

nsgradient_example.rb

  def make_stepped_gradient
   @grad = NSGradient.alloc.initWithColorsAndLocations(start_color, 0.0, middle_color, 0.015, end_color, 1.0, nil)
   # Explodes with:
   # 2014-02-23 10:52:01.323 my_app[86365:303] -[__NSCFNumber colorUsingColorSpace:]: unrecognized selector sent to instance 0x7f8764169b20
   # 2014-02-23 10:52:01.416 my_app[86365:303] -[__NSCFNumber colorUsingColorSpace:]: unrecognized selector sent to instance 0x7f8764169b20
  end
  def start_color
    @start_color ||= BW.rgba_color(100,100,100,1.0)
  end
  def middle_color
    @middle_color ||= BW.rgba_color(92,92,92,1.0)
  end
  def end_color
    @end_color ||= BW.rgba_color(85,85,85,1.0)
  end