像素模糊.m

- (UIImage *)antiAlias
{
   CGFloat border = 1.0f;
   CGRect rect = CGRectMake(border, border, self.size.width-2*border, self.size.height-2*border);

   UIImage *img = nil;
   
   UIGraphicsBeginImageContext(CGSizeMake(rect.size.width,rect.size.height));
   [self drawInRect:CGRectMake(-1, -1, self.size.width, self.size.height)];
   img = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
   
   UIGraphicsBeginImageContext(self.size);
   [img drawInRect:rect];
   UIImage* antiImage = UIGraphicsGetImageFromCurrentImageContext();
   UIGraphicsEndImageContext();
   
   return antiImage;
}