给UIImage添加生成圆角图片的扩展API：

1. 给UIImage添加生成圆角图片的扩展API：

- (UIImage *)hyb_imageWithCornerRadius:(CGFloat)radius {

  CGRect rect = (CGRect){0.f, 0.f, self.size};

  UIGraphicsBeginImageContextWithOptions(self.size, NO, UIScreen.mainScreen.scale);

  CGContextAddPath(UIGraphicsGetCurrentContext(),

                   [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius].CGPath);

  CGContextClip(UIGraphicsGetCurrentContext());

  [self drawInRect:rect];

  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  return image;

}