GradientView with RubyMotion

gradient_view.rb

class GradientView  < UIView
  def initWithFrame(frame) 
    if super 
      rgb = CGColorSpaceCreateDeviceRGB()
      ptr = Pointer.new(:float, 8)
      ptr[0] = 1.0
      ptr[1] = 0.0
      ptr[2] = 0.0
      ptr[3] = 1.0
      ptr[4] = 0.0
      ptr[5] = 0.0
      ptr[6] = 0.0
      ptr[7] = 1.0
      @gradient = CGGradientCreateWithColorComponents(rgb, ptr, nil, 2)
      CGColorSpaceRelease(rgb) 
    end
    self 
  end

  def drawRect(rect) 
    context = UIGraphicsGetCurrentContext()
    start = rect.origin
    start.y = 0; 
    end_point = CGPointMake(rect.origin.x, 480.0)
    CGContextDrawLinearGradient(context, @gradient, start, end_point, KCGGradientDrawsBeforeStartLocation | KCGGradientDrawsAfterEndLocation)
    super
  end
end