UIImage+Blur+Swift4.swift

extension UIImage {
    func blurred(radius: CGFloat) -> UIImage {
        let ciContext = CIContext(options: nil)
        guard let cgImage = cgImage else { return self }
        let inputImage = CIImage(cgImage: cgImage)
        guard let ciFilter = CIFilter(name: "CIGaussianBlur") else { return self }
        ciFilter.setValue(inputImage, forKey: kCIInputImageKey)
        ciFilter.setValue(radius, forKey: "inputRadius")
        guard let resultImage = ciFilter.value(forKey: kCIOutputImageKey) as? CIImage else { return self }
        guard let cgImage2 = ciContext.createCGImage(resultImage, from: inputImage.extent) else { return self }
        return UIImage(cgImage: cgImage2)
    }
}

Its took 200% of CPU, its very huge and UIThread is blocking, any other solution for this.
Thank you

The documentation says CIContext() is very expensive. Do that once in your app and use the variable throughout the app.

extension DispatchQueue {
    static func background(_ task: (() -> Void)? = nil, completion: (() -> Void)? = nil) {
        global(qos: .background).async {
            task?()
            if let completion = completion {
                main.async {
                    completion()
                }
            }
        }
    }
    
    static func userInitiated(_ task: (() -> Void)? = nil, completion: (() -> Void)? = nil) {
        global(qos: .userInitiated).async {
            task?()
            if let completion = completion {
                main.async {
                    completion()
                }
            }
        }
    }
}

extension UIImage {
    func blurred(radius: CGFloat, completion: ((UIImage?) -> Void)?) {
        var image: UIImage?
        DispatchQueue.background {
            let ciContext = CIContext(options: nil)
            guard let cgImage = self.cgImage else {
                completion?(nil)
                return
            }
            let inputImage = CIImage(cgImage: cgImage)
            guard let ciFilter = CIFilter(name: "CIGaussianBlur") else {
                completion?(nil)
                return
            }
            ciFilter.setValue(inputImage, forKey: kCIInputImageKey)
            ciFilter.setValue(radius, forKey: "inputRadius")
            guard let resultImage = ciFilter.value(forKey: kCIOutputImageKey) as? CIImage else {
                completion?(nil)
                return
            }
            guard let cgImage2 = ciContext.createCGImage(resultImage, from: inputImage.extent) else {
                completion?(nil)
                return
            }
            image = UIImage(cgImage: cgImage2)
        } completion: {
            completion?(image)
        }
    }
}

Usage:

backgroundImage.image?.blurred(radius: 7.0, completion: { [weak self] image in
                self?.backgroundImage.image = image
            })