高斯模糊滤镜逆转：iOS

//Get a UIImage from the UIView
    UIGraphicsBeginImageContext(self.view.bounds.sizE);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //Blur the UIImage
    CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage];
    CIFilter *gaussianBlurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [gaussianBlurFilter SETVALue:imageToBlur forKey:@"inputImage"];
    [gaussianBlurFilter SETVALue:[NSnumber numberWithFloat:2] forKey:@"inpuTradius"];
    CIImage *resultImage = [gaussianBlurFilter valueForKey:@"outputImage"];
    UIImage *endImage = [[UIImage alloc] initWithCIImage:resultImage];

    //Place the UIImage in a UIImageView
    newView = [[UIImageView alloc] initWithFrame:self.view.bounds];
    newView.image = endImage;
    [self.view addSubview:newView];

它工作得很好,但我希望能够将其反转并使视图恢复正常.

我怎么能这样做,因为试图简单地从它的超视图中移除模糊的视图不起作用.我也尝试过将各种属性设置为零而没有运气.