添加高斯滤镜效果 （图片模糊化）

//添加滤镜

- (UIImage *)addFilter:(NSString *)sender

{

CIContext *context = [CIContext contextWithOptions:nil];

CIImage *image = [CIImage imageWithContentsOfURL:[NSURL URLWithString:sender]];

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

[filter setValue:image forKey:kCIInputImageKey];

[filter setValue:@50.0f forKey: @"inputRadius"];

CIImage *result = [filter valueForKey:kCIOutputImageKey];

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

UIImage * blurImage = [UIImage imageWithCGImage:outImage];

return blurImage;

}