颜色生成图片

• (UIImage *)buttonImageFromColor:(UIColor *)color{

  CGRect rect = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);

  UIGraphicsBeginImageContext(rect.size);

  CGContextRef context = UIGraphicsGetCurrentContext();

  CGContextSetFillColorWithColor(context, [color CGColor]);

  CGContextFillRect(context, rect);

  UIImage *img = UIGraphicsGetImageFromCurrentImageContext();

  UIGraphicsEndImageContext();

  return img;

}