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[操作系统]CAGradientLayer渐变效果


属性

  1. startPointendPoint
    决定渐变方向,以单位坐标系定义。左上角{0,0},右下角{1,1}
  2. colors
    渐变的颜色,是一个CGColorRef的数组。
  3. locations
    定义了渲染的每个颜色的位置。取值在0到1之间。长度一定和colors相同。

例子

  1. 多重渐变

      var gradientLayer = CAGradientLayer.init()  gradientLayer.colors = [UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.6).CGColor,UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.9).CGColor,UIColor.init(white: 0.4, alpha: 0.5).CGColor]  gradientLayer.colors = [UIColor.blackColor().CGColor,UIColor.yellowColor().CGColor,UIColor.blueColor().CGColor]  gradientLayer.locations = [0.1,0.3,0.5]  gradientLayer.frame = textLayer.bounds  gradientLayer.startPoint = CGPointMake(1, 0)  gradientLayer.endPoint = CGPointMake(1, 1)//    textLayer.mask = gradientLayer  self.contentView.layer.addSublayer(gradientLayer)   

  2. 作为蒙版,实现文字渐变

      var gradientLayer = CAGradientLayer.init()  gradientLayer.colors = [UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.6).CGColor,UIColor.init(red: 0, green: 0, blue: 0, alpha: 0.9).CGColor,UIColor.init(white: 0.4, alpha: 0.5).CGColor]//    gradientLayer.colors = [UIColor.blackColor().CGColor,UIColor.yellowColor().CGColor,UIColor.blueColor().CGColor]  gradientLayer.locations = [0.1,0.3,0.5]  gradientLayer.frame = textLayer.bounds  gradientLayer.startPoint = CGPointMake(1, 0)  gradientLayer.endPoint = CGPointMake(1, 1)  textLayer.mask = gradientLayer