title: Alpha component on UIBezierPath Fill
body: <p>I have a view defined like this : </p>
  
  <pre><code>class TriangleView: UIView {
  
  
  override func drawRect(rect: CGRect) {
  
      // Get Height and Width
      let layerHeight = self.layer.frame.height
      let layerWidth = self.layer.frame.width
  
      // Create Path
      let bezierPath = UIBezierPath()
  
      bezierPath.moveToPoint(CGPointMake(0, 0))
      bezierPath.addLineToPoint(CGPointMake(0, layerHeight))
      bezierPath.addLineToPoint(CGPointMake(layerWidth, layerHeight + 4))
      bezierPath.addLineToPoint(CGPointMake(0, 0))
      bezierPath.closePath()
  
      // Apply Color
      UIColor(red: (69/255.0), green: (209/255.0), blue: (153/255.0), alpha: 1.0).setFill()
      bezierPath.fill()
  
      // Mask to Path
      let shapeLayer = CAShapeLayer()
      shapeLayer.borderColor = UIColor.clearColor().CGColor
      shapeLayer.path = bezierPath.CGPath
      self.layer.mask = shapeLayer
  
  }
  
  }
  </code></pre>
  
  <p>I'm trying to make it semi-transparent, however using <code>UIColor(red: (69/255.0), green: (209/255.0), blue: (153/255.0), alpha: 0.5).setFill()</code> as well as using <code>bezierPath.fillWithBlendMode( .Normal, alpha: 0.5)</code> produces the same result of a darker than normal color with no transparency, the more I decrease the <code>alpha</code> in both cases, the darker the color becomes. I'm not sure what I'm doing wrong. </p>