Swift 3.0

Take a screenshot of current screen and make it blur.

//

// Helper.swift

// Blur

//

// Created by Narender Kumar on 09/10/18.

// Copyright © 2018 Appster. All rights reserved.

//

import Foundation

import UIKit

extension UIApplication {

var screenShot: UIImage? {

if let layer = keyWindow?.layer {

let scale = UIScreen.main.scale

UIGraphicsBeginImageContextWithOptions(layer.frame.size, false, scale);

if let context = UIGraphicsGetCurrentContext() {

layer.render(in: context)

let screenshot = UIGraphicsGetImageFromCurrentImageContext()

UIGraphicsEndImageContext()

return screenshot

}

}

return nil

}

}

func blurEffect(_ img: UIImage)-> UIImage {

let context = CIContext(options: nil)

let currentFilter = CIFilter(name: "CIGaussianBlur")

let beginImage = CIImage(image: img)

currentFilter!.setValue(beginImage, forKey: kCIInputImageKey)

currentFilter!.setValue(10, forKey: kCIInputRadiusKey)

let cropFilter = CIFilter(name: "CICrop")

cropFilter!.setValue(currentFilter!.outputImage, forKey: kCIInputImageKey)

cropFilter!.setValue(CIVector(cgRect: beginImage!.extent), forKey: "inputRectangle")

let output = cropFilter!.outputImage

let cgimg = context.createCGImage(output!, from: output!.extent)

let processedImage = UIImage(cgImage: cgimg!)

return processedImage

}

Full project code link