CODEWITHSUNDEEP
iosswift
Tolgay Toklar
Tolgay Toklar

Reputation: 4343

Adding blur effect to background in swift

I am setting a background image to view controller. But also i want to add blur effect to this background. How can I do this?

I am setting background with following code:

self.view.backgroundColor = UIColor(patternImage: UIImage(named: "testBg")!)

I found on internet for blur imageview how can i implement this to my background?

var darkBlur = UIBlurEffect(style: UIBlurEffectStyle.Dark)
// 2
var blurView = UIVisualEffectView(effect: darkBlur)
blurView.frame = imageView.bounds
// 3
imageView.addSubview(blurView)

Upvotes: 158

Views: 233521

Answers (14)

Vladimir Kuzomenskyi
Vladimir Kuzomenskyi

Reputation: 521

Swift 5.7 - blur with custom radius

Usage example:

let view = UIImageView(image: bluredImage(view: superview!, radius: 1.5))

Extension:

extension UIView { 
    func bluredImage(view: UIView, radius: CGFloat = 1) -> UIImage {
        let image = view.snapShotImage()
        
        if let source = image.cgImage {
            let context = CIContext(options: nil)
            let inputImage = CIImage(cgImage: source)
            
            let clampFilter = CIFilter(name: "CIAffineClamp")
            clampFilter?.setDefaults()
            clampFilter?.setValue(inputImage, forKey: kCIInputImageKey)
            
            if let clampedImage = clampFilter?.value(forKey: kCIOutputImageKey) as? CIImage {
                let explosureFilter = CIFilter(name: "CIExposureAdjust")
                explosureFilter?.setValue(clampedImage, forKey: kCIInputImageKey)
                explosureFilter?.setValue(-1.0, forKey: kCIInputEVKey)
                
                if let explosureImage = explosureFilter?.value(forKey: kCIOutputImageKey) as? CIImage {
                    let filter = CIFilter(name: "CIGaussianBlur")
                    filter?.setValue(explosureImage, forKey: kCIInputImageKey)
                    filter?.setValue("\(radius)", forKey:kCIInputRadiusKey)
                    
                    if let result = filter?.value(forKey: kCIOutputImageKey) as? CIImage {
                        let bounds = UIScreen.main.bounds
                        let cgImage = context.createCGImage(result, from: bounds)
                        let returnImage = UIImage(cgImage: cgImage!)
                        return returnImage
                    }
                }
            }
        }
        return UIImage()
    }
    
    private func snapShotImage() -> UIImage {
        UIGraphicsBeginImageContext(self.frame.size)
        if let context = UIGraphicsGetCurrentContext() {
            self.layer.render(in: context)
            let image = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            return image!
        }
        
        return UIImage()
    }
}

Upvotes: 0

starmarmor
starmarmor

Reputation: 86

Thanks to @Maruta https://stackoverflow.com/a/56334283/16457129 for the answer If anyone else asks, you can reduce the blur effect with the background color of the view.

    func drawBackgroundBlur() {
        backgroundView.layer.cornerRadius = 27
        // Here, you can increase the alpha value to increase the blur effect
        backgroundView.backgroundColor = UIColor.white.withAlphaComponent(0.05)
        
        let blurredView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
        blurredView.frame = backgroundRewardsView.bounds
        blurredView.layer.cornerRadius = 27
        backgroundView.addSubview(blurredView)
    }

Upvotes: 1

Alvin George
Alvin George

Reputation: 14296

You can make an extension of UIImageView.

Swift 2.0

import Foundation
import UIKit

extension UIImageView
{
    func makeBlurImage(targetImageView:UIImageView?)
    {
        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = targetImageView!.bounds

        blurEffectView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight] // for supporting device rotation
        targetImageView?.addSubview(blurEffectView)
    }
}

Usage:

override func viewDidLoad()
{
    super.viewDidLoad()

    let sampleImageView = UIImageView(frame: CGRectMake(0, 200, 300, 325))
    let sampleImage:UIImage = UIImage(named: "ic_120x120")!
    sampleImageView.image =  sampleImage

    //Convert To Blur Image Here
    sampleImageView.makeBlurImage(sampleImageView)

    self.view.addSubview(sampleImageView)
}

Swift 3 Extension

import Foundation
import UIKit

extension UIImageView
{
    func addBlurEffect()
    {
        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = self.bounds

        blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight] // for supporting device rotation
        self.addSubview(blurEffectView)
    }
}

Usage:

yourImageView.addBlurEffect()

Addendum:

extension UIView {
  
  /// Remove UIBlurEffect from UIView
  func removeBlurEffect() {
    let blurredEffectViews = self.subviews.filter{$0 is UIVisualEffectView}
    blurredEffectViews.forEach{ blurView in
      blurView.removeFromSuperview()
    }
  }

Swift 5.0:

import UIKit


extension UIImageView {
    func applyBlurEffect() {
        let blurEffect = UIBlurEffect(style: .light)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = bounds
        blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        addSubview(blurEffectView)
    }
}

Upvotes: 59

pramod Tomar
pramod Tomar

Reputation: 1

let blurEffect = UIBlurEffect(style: UIBlurEffect.Style.dark)
                    let blurEffectView = UIVisualEffectView(effect: blurEffect)
                    blurEffectView.backgroundColor = .black
                    blurEffectView.alpha = 0.5
                    blurEffectView.frame = topView.bounds
                    if !self.presenting {
                        blurEffectView.frame.origin.x = 0
                    } else {
                        blurEffectView.frame.origin.x = -topView.frame.width
                    }
                    blurEffectView.frame.origin.x = -topView.frame.width
                    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
                    UIView.animate(withDuration: 0.2, delay: 0.0, options: [.curveEaseIn]) {
                        if !self.presenting {
                            blurEffectView.frame.origin.x = -topView.frame.width
                        } else {
                            blurEffectView.frame.origin.x = 0
                        }
                        view.addSubview(blurEffectView)
                    } completion: { (status) in
                        
                    }

Upvotes: 0

Sunkas
Sunkas

Reputation: 9590

In a UIView extension:

func addBlurredBackground(style: UIBlurEffect.Style) {
    let blurEffect = UIBlurEffect(style: style)
    let blurView = UIVisualEffectView(effect: blurEffect)
    blurView.frame = self.frame
    blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    self.addSubview(blurView)
    self.sendSubviewToBack(blurView)
}

Upvotes: 2

Donovan Marsh
Donovan Marsh

Reputation: 299

You should always use .dark for style and add the following code to make it look cool

    blurEffectView.backgroundColor = .black
    blurEffectView.alpha = 0.4

Upvotes: 3

J. Doe
J. Doe

Reputation: 13033

This one always keeps the right frame:

public extension UIView {

    @discardableResult
    public func addBlur(style: UIBlurEffect.Style = .extraLight) -> UIVisualEffectView {
        let blurEffect = UIBlurEffect(style: style)
        let blurBackground = UIVisualEffectView(effect: blurEffect)
        addSubview(blurBackground)
        blurBackground.translatesAutoresizingMaskIntoConstraints = false
        blurBackground.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
        blurBackground.topAnchor.constraint(equalTo: topAnchor).isActive = true
        blurBackground.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
        blurBackground.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
        return blurBackground
    }
}

Upvotes: 7

Maruta
Maruta

Reputation: 1091

This worked for me on Swift 5 

let blurredView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
blurredView.frame = self.view.bounds
backgroundimage.addSubview(blurredView)

Upvotes: 12

Dharmesh Kheni
Dharmesh Kheni

Reputation: 71854

I have tested this code and it's working fine:

let blurEffect = UIBlurEffect(style: UIBlurEffect.Style.dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(blurEffectView)

For Swift 3.0:

let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(blurEffectView)

For Swift 4.0:

let blurEffect = UIBlurEffect(style: UIBlurEffect.Style.dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(blurEffectView)

Here you can see result:

blurred view

Or you can use this lib for that:

https://github.com/FlexMonkey/Blurable

Upvotes: 409

apollovishwas
apollovishwas

Reputation: 137

This Code is Working Fine For me! its for Swift 4.x

let blurEffect = UIBlurEffect(style: .ExtraLight)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = self.view.frame
self.view.insertSubview(blurEffectView, atIndex: 0)

Upvotes: 2

Rajamohan S
Rajamohan S

Reputation: 7269

For Swift 3 (iOS 10.0 and 8.0)

var darkBlur:UIBlurEffect = UIBlurEffect()

if #available(iOS 10.0, *) { //iOS 10.0 and above
    darkBlur = UIBlurEffect(style: UIBlurEffectStyle.prominent)//prominent,regular,extraLight, light, dark
} else { //iOS 8.0 and above
  darkBlur = UIBlurEffect(style: UIBlurEffectStyle.dark) //extraLight, light, dark
}
let blurView = UIVisualEffectView(effect: darkBlur)
blurView.frame = self.view.frame //your view that have any objects
blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
view.addSubview(blurView)

Upvotes: 12

Jenel Ejercito Myers
Jenel Ejercito Myers

Reputation: 2703

Found another way.. I use apple's UIImage+ImageEffects.

 UIImage *effectImage = [image applyExtraLightEffect];                        
 self.imageView.image = effectImage;

Upvotes: 0

hbk
hbk

Reputation: 11184

U can also use CoreImage to create blurred image with dark effect

  1. Make snapshot for image

    func snapShotImage() -> UIImage {
    UIGraphicsBeginImageContext(self.frame.size)
    if let context = UIGraphicsGetCurrentContext() {
        self.layer.renderInContext(context)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }

    return UIImage()
}

  2. Apply CoreImage Filters as u wish with 

    private func bluredImage(view:UIView, radius:CGFloat = 1) -> UIImage {
let image = view.snapShotImage()

if let source = image.CGImage {
    let context = CIContext(options: nil)
    let inputImage = CIImage(CGImage: source)

    let clampFilter = CIFilter(name: "CIAffineClamp")
    clampFilter?.setDefaults()
    clampFilter?.setValue(inputImage, forKey: kCIInputImageKey)

    if let clampedImage = clampFilter?.valueForKey(kCIOutputImageKey) as? CIImage {
        let explosureFilter = CIFilter(name: "CIExposureAdjust")
        explosureFilter?.setValue(clampedImage, forKey: kCIInputImageKey)
        explosureFilter?.setValue(-1.0, forKey: kCIInputEVKey)

        if let explosureImage = explosureFilter?.valueForKey(kCIOutputImageKey) as? CIImage {
            let filter = CIFilter(name: "CIGaussianBlur")
            filter?.setValue(explosureImage, forKey: kCIInputImageKey)
            filter?.setValue("\(radius)", forKey:kCIInputRadiusKey)

            if let result = filter?.valueForKey(kCIOutputImageKey) as? CIImage {
                let bounds = UIScreen.mainScreen().bounds
                let cgImage = context.createCGImage(result, fromRect: bounds)
                let returnImage = UIImage(CGImage: cgImage)
                return returnImage
            }
        }
    }
}
return UIImage()
}

Upvotes: 14

Blain Ellis
Blain Ellis

Reputation: 299

@AlvinGeorge should just use:

extension UIImageView{        
    func blurImage()
    {
        let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
        let blurEffectView = UIVisualEffectView(effect: blurEffect)
        blurEffectView.frame = self.bounds

        blurEffectView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight] // for supporting device rotation
        self.addSubview(blurEffectView)
    }
}

usage:

 blurredBackground.frame = self.view.bounds
 blurredBackground.blurImage()
 self.view.addSubview(self.blurredBackground)

Upvotes: 15

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