做一个渐变背景的图片

做一个颜色渐变的view

//初始化CAFradientLayer

    let gradientLayer = CAGradientLayer()
  gradientLayer.frame = bianseView.frame
   self.bianseView.layer.addSublayer(gradientLayer)
   //设置开始和结束位置
   gradientLayer.startPoint = CGPointMake(0, 0)
   gradientLayer.endPoint = CGPointMake(1, 0)
   //设置渐变的颜色数组
   gradientLayer.colors = [UIColor(red: 175/255.0, green: 235/255.0, blue: 212/255.0, alpha: 1).CGColor,UIColor(red: 255/255.0, green: 175/255.0, blue: 220/255.0, alpha: 0.7).CGColor]
   //设置渐变维度,0为开始,1为结束
   gradientLayer.locations = [0,1]
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