How to Apply Blur to a Uiview

swift - Add blur to UIView in order to blur the Controller below? Read before

this is what I've done

class ViewController: UIViewController,UIPickerViewDataSource, UIPickerViewDelegate {

var pickerDataSource = ["White", "Red", "Green", "Blue"];
@IBOutlet var pickerView: UIPickerView!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.regular)
    let blurEffectView = UIVisualEffectView(effect: blurEffect)
    blurEffectView.frame = view.bounds
    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    self.pickerView.delegate = self
    self.pickerView.dataSource = self
    self.view.addSubview(blurEffectView)
    self.view.bringSubview(toFront: self.pickerView)

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return pickerDataSource.count;
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    return pickerDataSource[row]
}

}

How to apply blur to a UIView?

Ever since the release of iOS 7, This question has been getting a lot of hits and I thought I should follow up on what I ended up doing.

I personally blurred the picture at the time with photoshop, but there are many great third party libraries available that do dynamic and static blurring, here are a couple:

• This ingenious library takes a layer from UITabBar and applies to
  any view to get iOS 7's native blur:
  https://github.com/JagCesar/iOS-blur/
• This library is a real time blurring library that live blurs any view
  below it: https://github.com/alexdrone/ios-realtimeblur (as pointed out by qegal)
• Another one that does the same realtime blur:
  https://github.com/nicklockwood/FXBlurView
• This Library is the one I personally use and is Great, allowing
  you to set the tint color among other settings:
  https://github.com/ivoleko/ILTranslucentView

I wanted to post this because you no longer need to take screenshots of individual frames or screen.

iOS 8: With the coming release of iOS 8, Apple has included a built in blurred UIView, UIVisualEffectView (https://developer.apple.com/documentation/uikit/uivisualeffectview)

Adding blur effect to background in swift

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:

Or you can use this lib for that:

https://github.com/FlexMonkey/Blurable

How create transparent view with with blur effect?

I found an excellent tutorial that might help you to create a smooth transparent view with blur effect: https://www.raywenderlich.com/167-uivisualeffectview-tutorial-getting-started

How do I correctly blur a UIView using a UIVisualEffectView?

Try changing this line: backgroundView.addSubview(blurEffectView)
to this: backgroundView.insertSubview(blurEffectView, at: 0)

Creating a blurring overlay view

You can use UIVisualEffectView to achieve this effect. This is a native API that has been fine-tuned for performance and great battery life, plus it's easy to implement.

Swift:

//only apply the blur if the user hasn't disabled transparency effects
if !UIAccessibility.isReduceTransparencyEnabled {
    view.backgroundColor = .clear

    let blurEffect = UIBlurEffect(style: .dark)
    let blurEffectView = UIVisualEffectView(effect: blurEffect)
    //always fill the view
    blurEffectView.frame = self.view.bounds
    blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    view.addSubview(blurEffectView) //if you have more UIViews, use an insertSubview API to place it where needed
} else {
    view.backgroundColor = .black
}

Objective-C:

//only apply the blur if the user hasn't disabled transparency effects
if (!UIAccessibilityIsReduceTransparencyEnabled()) {
    self.view.backgroundColor = [UIColor clearColor];

    UIBlurEffect *blurEffect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
    UIVisualEffectView *blurEffectView = [[UIVisualEffectView alloc] initWithEffect:blurEffect];
    //always fill the view
    blurEffectView.frame = self.view.bounds;
    blurEffectView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    [self.view addSubview:blurEffectView]; //if you have more UIViews, use an insertSubview API to place it where needed
} else {
    self.view.backgroundColor = [UIColor blackColor];
}

If you are presenting this view controller modally to blur the underlying content, you'll need to set the modal presentation style to Over Current Context and set the background color to clear to ensure the underlying view controller will remain visible once this is presented overtop.

Is there a method to blur a background in SwiftUI?

1. The Native SwiftUI way:

Just add .blur() modifier on anything you need to be blurry like:

Image("BG")
   .blur(radius: 20)

_{Note the top and bottom of the view}

Note that you can Group multiple views and blur them together.

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2. The Visual Effect View:

You can bring the prefect UIVisualEffectView from the UIKit:

VisualEffectView(effect: UIBlurEffect(style: .dark))

With this tiny struct:

struct VisualEffectView: UIViewRepresentable {
    var effect: UIVisualEffect?
    func makeUIView(context: UIViewRepresentableContext) -> UIVisualEffectView { UIVisualEffectView() }
    func updateUIView(_ uiView: UIVisualEffectView, context: UIViewRepresentableContext) { uiView.effect = effect }
}

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3. iOS 15: Materials

You can use iOS predefined materials with one line code:

.background(.ultraThinMaterial)

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