请问一下有人遇到过 CAGradientLayer 无法截图的问题

• 主 資深大佬 : pptk

  已解决
  //绘制渐变
  UIColor *firstColor = [[UIColor alloc]initWithCGColor:(CGColorRef)self.bgLayer.colors.firstObject];
  UIColor *lastColor = [[UIColor alloc]initWithCGColor:(CGColorRef)self.bgLayer.colors.lastObject];
  //创建一个 RGB 的颜色空间
  CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
  //定义渐变颜色数组
  CGFloat colors[] = {
  firstColor.qmui_red, firstColor.qmui_green, firstColor.qmui_blue, 1.00,
  lastColor.qmui_red, lastColor.qmui_green, lastColor.qmui_blue, 1.00
  };
  CGGradientRef _gradient = CGGradientCreateWithColorComponents(rgb, colors, NULL, sizeof(colors)/(sizeof(colors[0])*4));
  UIGraphicsBeginImageContextWithOptions(self.preImage.size, NO, self.preImage.scale);
  CGContextRef context = UIGraphicsGetCurrentContext();
  CGContextInspectContext(context);
  CGPoint start = CGPointMake(self.preImage.size.width/2, 0);
  CGPoint end = CGPointMake(self.preImage.size.width/2, self.preImage.size.height);
  CGContextDrawLinearGradient(context, _gradient, start, end, kCGGradientDrawsBeforeStartLocation);

  CGImageRef imageRef = self.preImage.CGImage;
  CGImageRef subImageRef = CGImageCreateWithImageInRect(imageRef,CGRectMakeWithSize(self.preImage.size));
  CGContextDrawImage(context, CGRectMakeWithSize(self.preImage.size), subImageRef);

  UIImage *imageOut = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();