IOS 根据指定图片，画一个带圆角背景的图片

根据指定图片，画一个带圆角背景的图片

/// 这里因为SGQRCodeGenerateManager的方法只需要一张图片，因此这里根据图片创建View，然后把把View投影成图片
/// @param image 被包裹的图片

• (UIImage *)makeScaledRoundCornerLogo:(UIImage *)image {
  // 1. 设置上下文大小为64 * 屏幕的scale，防止模糊
  CGSize size = CGSizeMake(64 * UIScreen.mainScreen.scale, 64 * UIScreen.mainScreen.scale);
  // - - - - - - - - - - - - - - - - 添加中间小图标 - - - - - - - - - - - - - - - -
  // 2、开启绘图, 获取图形上下文
  UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));
  // 3、画圆，作出圆角
  UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, size.width, size.height) cornerRadius:10 * UIScreen.mainScreen.scale];
  [path addClip];
  // 3、用白色进行填充
  CGContextSetFillColorWithColor(UIGraphicsGetCurrentContext(), [UIColor.whiteColor CGColor]);
  CGContextFillRect(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, size.width, size.height));

  // 4、再把小图片画上去
  UIImage *icon_image = image;
  CGFloat icon_imageW = 45 * UIScreen.mainScreen.scale;
  CGFloat icon_imageH = 45 * UIScreen.mainScreen.scale;
  CGFloat icon_imageX = (size.width - icon_imageW) * 0.5;
  CGFloat icon_imageY = (size.height - icon_imageH) * 0.5;

  [icon_image drawInRect:CGRectMake(icon_imageX, icon_imageY, icon_imageW, icon_imageH)];

  // 5、获取当前画得的这张图片
  UIImage *final_image = UIGraphicsGetImageFromCurrentImageContext();

  // 6、关闭图形上下文
  UIGraphicsEndImageContext();

  return final_image;
  }