我正在尝试在CGContext中使用CALayerGradient渲染圆锥渐变letcolors=[UIColor(hue:0,saturation:1.0,brightness:1.0,alpha:1.0).cgColor,UIColor(hue:1/6,saturation:1.0,brightness:1.0,alpha:1.0).cgColor,UIColor(hue:2/6,saturation:1.0,brightness:1.0,alpha:1.0).cgColor,UIColor(hue:0.5,saturation:1.0,brightness:1.0,alpha:1