我有一个视图定义如下:阿尔法分量填充
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
}
}
我试图使其半透明,但是使用UIColor(red: (69/255.0), green: (209/255.0), blue: (153/255.0), alpha: 0.5).setFill()
以及使用bezierPath.fillWithBlendMode(.Normal, alpha: 0.5)
产生的比暗相同的结果没有透明度的正常颜色,在这两种情况下我越减少alpha
,颜色越深。我不确定我做错了什么。