UIView+CIImageAdditions.m

@implementation UIView (CIImageAdditions)

- (CIImage *)CIImage {
  UIImage* image = nil;
  UIGraphicsBeginImageContext(self.frame.size); {

    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.layer renderInContext:context];
    image = UIGraphicsGetImageFromCurrentImageContext();

  }; UIGraphicsEndImageContext();
  
  return [CIImage imageWithCGImage:[image CGImage]];
}

@end

Would work if CIImage was available on iOS :D