CoreImage的一处简单使用

图片的模糊效果

- (UIImage *)blurryImage:(UIImage *)image            withBlurLevel:(CGFloat)blur {    CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];    CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"                         keysAndValues:kCIInputImageKey, inputImage,                                       @"inputRadius", @(blur),                                        nil];    CIImage *outputImage = filter.outputImage;    CGImageRef outImage = [self.context createCGImage:outputImage                                    fromRect:[outputImage extent]];    return [UIImage imageWithCGImage:outImage];}