adopt GaussianBlur Fiilter to UIImage

BlurFilter

UIImage *myImage = [UIImage imageNamed:@"some_image"];

CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [CIImage imageWithCGImage:myImage.CGImage];

CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
[filter setValue:inputImage forKey:kCIInputImageKey];
[filter setValue:@8.f forKey:@"inputRadius"]; // Default Value is 10.f
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];

self.imageView.image = [UIImage imageWithCGImage:cgImage];