UIImageview 模糊、高斯模糊

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         CIContext *context = [CIContext contextWithOptions:nil];

// 加载本地图片    

              UIImage *image = [UIImage imageNamed:@""];
                CIImage *image2 = [[CIImage alloc] initWithCGImage:image.CGImage];

        CIImage *image = [CIImage imageWithContentsOfURL:[NSURL URLWithString:@"www.123.jpg";

         CIFilter *filter = [CIFilterfilterWithName:@"CIGaussianBlur"];

        [filter setValue:image forKey:kCIInputImageKey];

// 设置模糊值

        [filter setValue:@20.0f forKey: @"inputRadius"];

        CIImage *result = [filter valueForKey:kCIOutputImageKey];

        CGImageRef outImage = [context createCGImage: result fromRect:[result extent]];

        UIImage * blurImage = [UIImage imageWithCGImage:outImage];

／／headerBGimage 是uiimageview

        headerBGimage.image = blurImage;

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