Add blur effect to image in Swift

Blur effect using CoreImage

First import CoreImage framework

import CoreImage

then add and call this function after replacing “bg” with your UIImageView

func blurEffect() {
        
        let context = CIContext(options: nil)
        
        let currentFilter = CIFilter(name: "CIGaussianBlur")
        let beginImage = CIImage(image: bg.image!)
        currentFilter!.setValue(beginImage, forKey: kCIInputImageKey)
        currentFilter!.setValue(5, 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!)
        bg.image = processedImage
    }