Creating a blurring overlay view

Question

In the Music app of the new iOS  we can see an album cover behind a view that blurs it    How can something like that be accomplished  I ve read the documentation  but did not find anything there

User · Answer

Found this by accident  gives me really great  near duplicate with Apple s  results and uses the Acceleration framework  -- http   pastebin com 6cs6hsyQ  Not written by me

User · Answer

OBJECTIVE-C      UIVisualEffect  blurEffect  blurEffect    UIBlurEffect effectWithStyle UIBlurEffectStyleDark   UIVisualEffectView  visualEffectView  visualEffectView     UIVisualEffectView alloc  initWithEffect blurEffect   visualEffectView frame   self accessImageView bounds   self accessImageView addSubview visualEffectView     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    from   https   stackoverflow com a 24083728 4020910

User · Answer

func blurBackgroundUsingImage image  UIImage        var frame                     CGRectMake 0  0  self view frame width  self view frame height      var imageView                 UIImageView frame  frame      imageView image               image     imageView contentMode          ScaleAspectFill     var blurEffect                UIBlurEffect style   Light      var blurEffectView            UIVisualEffectView effect  blurEffect      blurEffectView frame          frame     var transparentWhiteView      UIView frame  frame      transparentWhiteView backgroundColor   UIColor white  1 0  alpha  0 30      var viewsArray                 imageView  blurEffectView  transparentWhiteView       for index in 0   lt viewsArray count           if let oldView   self view viewWithTag index   1                var oldView           self view viewWithTag index   1                 Must explicitly unwrap oldView to access its removeFromSuperview   method as of Xcode 6 Beta 5             oldView  removeFromSuperview                     var viewToInsert          viewsArray index          self view insertSubview viewToInsert  atIndex  index   1          viewToInsert tag          index   1

User · Answer

Apple has provided an extension for the UIImage class called UIImage ImageEffects h  In  this class you have the desired methods for blurring your view

User · Answer

Here s an easy way to add custom blur without haggling with private APIs using UIViewPropertyAnimator   First  declare class property   var blurAnimator  UIViewPropertyAnimator    Then set your blur view in viewDidLoad     let blurEffectView   UIVisualEffectView   blurEffectView backgroundColor    clear blurEffectView frame   view bounds blurEffectView autoresizingMask     flexibleWidth   flexibleHeight  view addSubview blurEffectView   blurAnimator   UIViewPropertyAnimator duration  1  curve   linear     blurEffectView  in     blurEffectView effect   UIBlurEffect style   light     blurAnimator fractionComplete   0 15    set the blur intensity        Note  This solution is not suitable for UICollectionView UITableView cells

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Swift 4   To add an overlay  or the popup view You can also use the Container View with which you get a free View Controller   you get the Container View from the usual object palette library   Steps   Have a View  ViewForContainer in the pic  that holds this Container View  to dim it when the contents of Container View are displayed  Connect the outlet inside the first View Controller  Hide this View when 1st VC loads  Unhide when Button is clicked enter image description here  To dim this View when the Container View content is displayed  set the Views Background to Black and opacity to 30   I have added an answer to the popview view creation in other Stackoverflow question https   stackoverflow com a 49729431 5438240

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In case this helps anyone  here is a swift extension I created based on the answer by Jordan H  It is written in Swift 5 and can be used from Objective C   extension UIView         objc func blurBackground style  UIBlurEffect Style  fallbackColor  UIColor            if  UIAccessibility isReduceTransparencyEnabled               self backgroundColor    clear              let blurEffect   UIBlurEffect style  style              let blurEffectView   UIVisualEffectView effect  blurEffect                always fill the view             blurEffectView frame   self self bounds             blurEffectView autoresizingMask     flexibleWidth   flexibleHeight               self insertSubview blurEffectView  at  0            else               self backgroundColor   fallbackColor                      NOTE  If you want to blur the background of an UILabel without affecting the text  you should create a container UIView  add the UILabel to the container UIView as a subview  set the UILabel s backgroundColor to UIColor clear  and then call blurBackground style  UIBlurEffect Style  fallbackColor  UIColor  on the container UIView  Here s a quick example of this written in Swift 5   let frame   CGRect x  50  y  200  width  200  height  50  let containerView   UIView frame  frame  let label   UILabel frame  frame  label text    Some Text  label backgroundColor   UIColor clear containerView addSubview label  containerView blurBackground style   dark  fallbackColor  UIColor black

User · Answer

Accepted answer is correct but there s an important step missing here  in case this view - for which you want blurred background - is presented using   self presentViewController vc animated YES completion nil   By default  this will negate the blur as UIKit removes the presenter s view  which you are actually blurring  To avoid that removal  add this line before the previous one  vc modalPresentationStyle   UIModalPresentationOverFullScreen   Or use other Over styles

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An important supplement to  Joey s answer  This applies to a situation where you want to present a blurred-background UIViewController with UINavigationController      suppose you ve done blur effect with your presented view controller UINavigationController  nav     UINavigationController alloc  initWithRootViewController       this is very important  if you don t do this  the blur effect will darken after view did appeared    the reason is that you actually present navigation controller  not presented controller    please note it s  OverFullScreen   not  OverCurrentContext  nav modalPresentationStyle   UIModalPresentationOverFullScreen   UIViewController  presentedViewController     UIViewController alloc  init       the presented view controller s modalPresentationStyle is  OverCurrentContext  presentedViewController modalPresentationStyle   UIModalPresentationOverCurrentContext    presentingViewController presentViewController nav animated YES completion nil     Enjoy

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Using UIImageEffects For people who wants more control  you could make use of Apple s UIImageEffects sample code  You can copy the code for UIImageEffects  from Apple s Developer Library   Blurring and Tinting an Image And here s how to apply it    import  quot UIImageEffects h quot       self originalImageView image    UIImageEffects imageByApplyingLightEffectToImage  UIImage imageNamed   quot yourImage png quot

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2019 code Here s a fuller example using the amazing  AdamBardon technique   IBDesignable class ButtonOrSomethingWithBlur  UIButton        var ba  UIViewPropertyAnimator      private lazy var blurry  BlurryBall     return BlurryBall            override func didMoveToSuperview             super didMoveToSuperview                       Setup the blurry ball   BE SURE TO TEARDOWN             Use superb trick to access the internal guassian level of Apple s            standard gpu blurrer per stackoverflow com a 55378168 294884                  superview  insertSubview blurry  belowSubview  self          ba   UIViewPropertyAnimator duration 1  curve  linear    weak self  in                note  those duration curve values are simply unusued             self  blurry effect   UIBlurEffect style   extraLight                    ba  fractionComplete   live largeplaybutton blurfactor                override func willMove toSuperview newSuperview  UIView                         Teardown for the blurry ball - critical                  if newSuperview    nil   print  quot safe teardown quot               ba  stopAnimation true              ba  finishAnimation at   current                       override func layoutSubviews     super layoutSubviews           blurry frame   bounds  your drawing frame or whatever         Aside  as a general iOS engineering matter  didMoveToWindow may be more suitable to you than didMoveToSuperview   Secondly  you may use some other way to do the teardown  but the teardown is the two lines of code shown there   BlurryBall is just a UIVisualEffectView  Notice the inits for a visual effects view   If you happen to need rounded corners or whatever  do it in this class  class BlurryBall  UIVisualEffectView            override init effect  UIVisualEffect     super init effect  effect          commonInit              required init  coder aDecoder  NSCoder    super init coder  aDecoder          commonInit              private func commonInit             clipsToBounds   true         backgroundColor    clear                override func layoutSubviews             super layoutSubviews           layer cornerRadius   bounds width   2

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Core Image  Since that image in the screenshot is static  you could use CIGaussianBlur from Core Image  requires iOS 6   Here is sample  https   github com evanwdavis Fun-with-Masks blob master Fun 20with 20Masks EWDBlurExampleVC m   Mind you  this is slower than the other options on this page    import  lt QuartzCore QuartzCore h gt   -  UIImage   blur  UIImage  theImage                        If you need re-orienting  e g  trying to blur a photo taken from the device camera front facing camera in portrait mode         theImage    self reOrientIfNeeded theImage           create our blurred image     CIContext  context    CIContext contextWithOptions nil       CIImage  inputImage    CIImage imageWithCGImage theImage CGImage           setting up Gaussian Blur  we could use one of many filters offered by Core Image      CIFilter  filter    CIFilter filterWithName   CIGaussianBlur         filter setValue inputImage forKey kCIInputImageKey        filter setValue  NSNumber numberWithFloat 15 0f  forKey   inputRadius        CIImage  result    filter valueForKey kCIOutputImageKey           CIGaussianBlur has a tendency to shrink the image a little          this ensures it matches up exactly to the bounds of our original image     CGImageRef cgImage    context createCGImage result fromRect  inputImage extent         UIImage  returnImage    UIImage imageWithCGImage cgImage    create a UIImage for this function to  return  so that ARC can manage the memory of the blur    ARC can t manage CGImageRefs so we need to release it before this function  returns  and ends      CGImageRelease cgImage    release CGImageRef because ARC doesn t manage this on its own       return returnImage                          if you need scaling        return   self class  scaleIfNeeded cgImage        UIImage   scaleIfNeeded  CGImageRef cgimg       bool isRetina      UIDevice currentDevice  systemVersion  intValue   gt   4  amp  amp    UIScreen mainScreen  scale     2 0      if  isRetina            return  UIImage imageWithCGImage cgimg scale 2 0 orientation UIImageOrientationUp         else           return  UIImage imageWithCGImage cgimg            -  UIImage   reOrientIfNeeded  UIImage  theImage       if  theImage imageOrientation    UIImageOrientationUp             CGAffineTransform reOrient   CGAffineTransformIdentity          switch  theImage imageOrientation                case UIImageOrientationDown              case UIImageOrientationDownMirrored                  reOrient   CGAffineTransformTranslate reOrient  theImage size width  theImage size height                   reOrient   CGAffineTransformRotate reOrient  M PI                   break              case UIImageOrientationLeft              case UIImageOrientationLeftMirrored                  reOrient   CGAffineTransformTranslate reOrient  theImage size width  0                   reOrient   CGAffineTransformRotate reOrient  M PI 2                   break              case UIImageOrientationRight              case UIImageOrientationRightMirrored                  reOrient   CGAffineTransformTranslate reOrient  0  theImage size height                   reOrient   CGAffineTransformRotate reOrient  -M PI 2                   break              case UIImageOrientationUp              case UIImageOrientationUpMirrored                  break                     switch  theImage imageOrientation                case UIImageOrientationUpMirrored              case UIImageOrientationDownMirrored                  reOrient   CGAffineTransformTranslate reOrient  theImage size width  0                   reOrient   CGAffineTransformScale reOrient  -1  1                   break              case UIImageOrientationLeftMirrored              case UIImageOrientationRightMirrored                  reOrient   CGAffineTransformTranslate reOrient  theImage size height  0                   reOrient   CGAffineTransformScale reOrient  -1  1                   break              case UIImageOrientationUp              case UIImageOrientationDown              case UIImageOrientationLeft              case UIImageOrientationRight                  break                     CGContextRef myContext   CGBitmapContextCreate NULL  theImage size width  theImage size height  CGImageGetBitsPerComponent theImage CGImage   0  CGImageGetColorSpace theImage CGImage   CGImageGetBitmapInfo theImage CGImage             CGContextConcatCTM myContext  reOrient            switch  theImage imageOrientation                case UIImageOrientationLeft              case UIImageOrientationLeftMirrored              case UIImageOrientationRight              case UIImageOrientationRightMirrored                  CGContextDrawImage myContext  CGRectMake 0 0 theImage size height theImage size width   theImage CGImage                   break               default                  CGContextDrawImage myContext  CGRectMake 0 0 theImage size width theImage size height   theImage CGImage                   break                     CGImageRef CGImg   CGBitmapContextCreateImage myContext           theImage    UIImage imageWithCGImage CGImg            CGImageRelease CGImg           CGContextRelease myContext              return theImage      Stack blur  Box   Gaussian    StackBlur This implements a mix of Box and Gaussian blur  7x faster than non accelerated gaussian  but not so ugly as box blur  See a demo in here  Java plugin version  or here  JavaScript version   This algorithm is used in KDE and Camera  and others  It doesn t use the Accelerate Framework but it s fast    Accelerate Framework   In the session    Implementing Engaging UI on iOS    from WWDC 2013 Apple explains how to create a blurred background  at 14 30   and mentions a method applyLightEffect implemented in the sample code using Accelerate framework   GPUImage uses OpenGL shaders to create dynamic blurs  It has several types of blur  GPUImageBoxBlurFilter  GPUImageFastBlurFilter  GaussianSelectiveBlur  GPUImageGaussianBlurFilter  There is even a GPUImageiOSBlurFilter that    should fully replicate the blur effect provided by iOS 7 s control panel     tweet  article   The article is detailed and informative         - UIImage   blurryGPUImage  UIImage   image withBlurLevel  NSInteger blur           GPUImageFastBlurFilter  blurFilter    GPUImageFastBlurFilter new           blurFilter blurSize   blur          UIImage  result    blurFilter imageByFilteringImage image           return result           From indieambitions com  Perform a blur using vImage  The algorithm is also used in iOS-RealTimeBlur  From Nick Lockwood  https   github com nicklockwood FXBlurView The example shows the blur over a scroll view  It blurs with dispatch async  then syncs to call updates with UITrackingRunLoopMode so the blur is not lagged when UIKit gives more priority to the scroll of the UIScrollView  This is explained in Nick s book iOS Core Animation  which btw it s great  iOS-blur This takes the blurring layer of the UIToolbar and puts it elsewhere  Apple will reject your app if you use this method  See https   github com mochidev MDBlurView issues 4 From Evadne blog  LiveFrost  Fast  Synchronous UIView Snapshot Convolving  Great code and a great read  Some ideas from this post     Use a serial queue to throttle updates from CADisplayLink  Reuse bitmap contexts unless bounds change  Draw smaller images using - CALayer renderInContext   with a 0 5f scale factor     Other stuff  Andy Matuschak said on Twitter     you know  a lot of the places where it looks like we re doing it in real time  it s static with clever tricks       At doubleencore com they say    we   ve found that a 10 pt blur radius plus a 10 pt increase in saturation best mimics iOS 7   s blur effect under most circumstances       A peek at the private headers of Apple s SBFProceduralWallpaperView   Finally  this isn t a real blur  but remember you can set rasterizationScale to get a pixelated image  http   www dimzzy com blog 2010 11 blur-effect-for-uiview

User · Answer

I think the easiest solution to this is to override UIToolbar  which blurs everything behind it in iOS 7  It s quite sneaky  but it s very simple for you to implement  and fast   You can do it with any view  just make it a subclass of UIToolbar instead of UIView  You can even do it with a UIViewController s view property  for example     1  create a new class that is a  Subclass of  UIViewController and check the box for  With XIB for user interface    2  Select the View and go to the identity inspector in the right-hand panel  alt-command-3   Change the  Class  to UIToolbar  Now go to the attributes inspector  alt-command-4  and change the  Background  color to  Clear Color    3  Add a subview to the main view and hook it up to an IBOutlet in your interface  Call it backgroundColorView  It will look something like this  as a private category in the implementation   m  file    interface BlurExampleViewController     property  weak  nonatomic  IBOutlet UIView  backgroundColorView   end   4  Go to the view controller implementation   m  file and change the -viewDidLoad method  to look as follows   -  void viewDidLoad        super viewDidLoad       self view barStyle   UIBarStyleBlack     this will give a black blur as in the original post     self backgroundColorView opaque   NO      self backgroundColorView alpha   0 5      self backgroundColorView backgroundColor    UIColor colorWithWhite 0 3 alpha 1       This will give you a dark gray view  which blurs everything behind it  No funny business  no slow core image blurring  using everything that is at your fingertips provided by the OS SDK   You can add this view controller s view to another view  as follows    self addChildViewController self blurViewController    self view addSubview self blurViewController view    self blurViewController didMoveToParentViewController self       animate the self blurViewController into view   Let me know if anything is unclear  I ll be happy to help     Edit  UIToolbar has been changed in 7 0 3 to give possibly-undesirable effect when using a coloured blur   We used to be able to set the colour using barTintColor  but if you were doing this before  you will need to set the alpha component to less than 1  Otherwise your UIToolbar will be completely opaque colour - with no blur   This can be achieved as follows   bearing in mind self is a subclass of UIToolbar   UIColor  color    UIColor blueColor      for example self barTintColor    color colorWithAlphaComponent 0 5     This will give a blue-ish tint to the blurred view

User · Answer

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

User · Answer

Simple answer is Add a subview and change it s alpha   UIView  mainView     UIView alloc  initWithFrame CGRectMake 0  0  200  200    UIView  subView     UIView alloc  initWithFrame popupView frame   UIColor   backImgColor    UIColor colorWithPatternImage  UIImage imageNamed   blue Img png     subView backgroundColor   backImgColor  subView alpha   0 5   mainView addSubview subView

User · Answer

From Xcode you can do it  easily  Follow the steps from xcode  Drage visual effect view on your uiview or imageview    Happy Coding

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Swift 3 Version of Kev s answer to return blurred image -  func blurBgImage image  UIImage  - gt  UIImage            let radius  CGFloat   20          let context   CIContext options  nil           let inputImage   CIImage cgImage  image cgImage            let filter   CIFilter name   CIGaussianBlur            filter  setValue inputImage  forKey  kCIInputImageKey           filter  setValue    radius    forKey kCIInputRadiusKey            if let result   filter  value forKey  kCIOutputImageKey  as  CIImage               let rect   CGRect origin  CGPoint x  radius   2 y  radius   2   size  CGSize width  image size width - radius   4  height  image size height - radius   4                if let cgImage   context createCGImage result  from  rect                   return UIImage cgImage  cgImage                                       return nil

User · Answer

This answer is based on Mitja Semolic s excellent earlier answer   I ve converted it to swift 3  added an explanation to what s happening in coments  made it an extension of a UIViewController so any VC can call it at will  added an unblurred view to show selective application  and added a completion block so that the calling view controller can do whatever it wants at the completion of the blur       import UIKit   This extension implements a blur to the entire screen  puts up a HUD and then waits and dismisses the view      extension UIViewController           func blurAndShowHUD duration  Double  message  String  completion   escaping    - gt  Void      with completion block               1  Create the blur effect  amp  the view it will occupy             let blurEffect   UIBlurEffect style  UIBlurEffectStyle light              let blurEffectView   UIVisualEffectView     effect  blurEffect              blurEffectView frame   self view bounds             blurEffectView autoresizingMask     flexibleWidth   flexibleHeight             2  Add the effect view to the main view             self view addSubview blurEffectView            3  Create the hud and add it to the main view         let hud   HudView getHUD view  self view  withMessage  message          self view addSubview hud            4  Begin applying the blur effect to the effect view         UIView animate withDuration  0 01  animations                blurEffectView effect   blurEffect                      5  Halt the blur effects application to achieve the desired blur radius         self view pauseAnimationsInThisView delay  0 004            6  Remove the view   amp  the HUD  after the completion of the duration         DispatchQueue main asyncAfter deadline   now     duration                blurEffectView removeFromSuperview               hud removeFromSuperview               self view resumeAnimationsInThisView               completion                      extension UIView       public func pauseAnimationsInThisView delay  Double            let time   delay   CFAbsoluteTimeGetCurrent           let timer   CFRunLoopTimerCreateWithHandler kCFAllocatorDefault  time  0  0  0    timer in             let layer   self layer             let pausedTime   layer convertTime CACurrentMediaTime    from  nil              layer speed   0 0             layer timeOffset   pausedTime                    CFRunLoopAddTimer CFRunLoopGetCurrent    timer  CFRunLoopMode commonModes            public func resumeAnimationsInThisView             let pausedTime    layer timeOffset          layer speed   1 0         layer timeOffset   0 0         layer beginTime   layer convertTime CACurrentMediaTime    from  nil  - pausedTime           I ve confirmed that it works with both iOS 10 3 1 and iOS 11

User · Answer

I decided to post a written Objective-C version from the accepted answer just to provide more options in this question     -  UIView   applyBlurToView  UIView   view withEffectStyle  UIBlurEffectStyle style andConstraints  BOOL addConstraints       only apply the blur if the user hasn t disabled transparency effects   if  UIAccessibilityIsReduceTransparencyEnabled            UIBlurEffect  blurEffect    UIBlurEffect effectWithStyle style       UIVisualEffectView  blurEffectView     UIVisualEffectView alloc  initWithEffect blurEffect       blurEffectView frame   view bounds        view addSubview blurEffectView        if addConstraints                add auto layout constraints so that the blur fills the screen upon rotating device        blurEffectView setTranslatesAutoresizingMaskIntoConstraints NO           view addConstraint  NSLayoutConstraint constraintWithItem blurEffectView                                                        attribute NSLayoutAttributeTop                                                        relatedBy NSLayoutRelationEqual                                                           toItem view                                                        attribute NSLayoutAttributeTop                                                       multiplier 1                                                         constant 0            view addConstraint  NSLayoutConstraint constraintWithItem blurEffectView                                                        attribute NSLayoutAttributeBottom                                                        relatedBy NSLayoutRelationEqual                                                           toItem view                                                        attribute NSLayoutAttributeBottom                                                       multiplier 1                                                         constant 0            view addConstraint  NSLayoutConstraint constraintWithItem blurEffectView                                                        attribute NSLayoutAttributeLeading                                                        relatedBy NSLayoutRelationEqual                                                           toItem view                                                        attribute NSLayoutAttributeLeading                                                       multiplier 1                                                         constant 0            view addConstraint  NSLayoutConstraint constraintWithItem blurEffectView                                                        attribute NSLayoutAttributeTrailing                                                        relatedBy NSLayoutRelationEqual                                                           toItem view                                                        attribute NSLayoutAttributeTrailing                                                       multiplier 1                                                         constant 0                else         view backgroundColor     UIColor blackColor  colorWithAlphaComponent 0 7          return view      The constraints could be removed if you want incase if you only support portrait mode or I just add a flag to this function to use them or not

User · Answer

I don t think I m allowed to post the code  but the above post mentioning the WWDC sample code is correct   Here is the link  https   developer apple com downloads index action name WWDC 202013  The file you re looking for is the category on UIImage  and the method is applyLightEffect   As I noted above in a comment  the Apple Blur has saturation and other things going on besides blur   A simple blur will not do    if you are looking to emulate their style

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Custom blur scale  You can try UIVisualEffectView with custom setting as -  class BlurViewController  UIViewController       private let blurEffect    NSClassFromString   UICustomBlurEffect   as  UIBlurEffect Type  init        override func viewDidLoad             super viewDidLoad           let blurView   UIVisualEffectView frame  UIScreen main bounds          blurEffect setValue 1  forKeyPath   blurRadius           blurView effect   blurEffect         view addSubview blurView               Output - for  blurEffect setValue 1     amp   blurEffect setValue 2

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If adds a dark blur view for tableView  this will beautifully make it   tableView backgroundColor    clear let blurEffect   UIBlurEffect style   dark  let blurEffectView   UIVisualEffectView effect  blurEffect  blurEffectView frame   tableView bounds blurEffectView autoresizingMask     flexibleHeight   flexibleWidth       Assigning blurEffectView to backgroundView instead of addSubview to tableView makes tableView cell not blocked by blurEffectView  tableView backgroundView   blurEffectView

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You can directly make your Background Blur using  Visual Effect View with Blur  and  Visual Effect View with Blur and Vibrancy    All you have to do for making Blur Background in iOS Application is      Go and search for  Visual Effect View with Blur  in Object Library   Step 1 Image   Drag the  Visual Effect View with Blur  in your Storyboard and setup it      Step 2 Image   Finally    You make your App Background Blur    Application Layout before clicking on any Button   Application View After Clicking on Button which makes the whole application background Blur

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Here s a fast implementation in Swift using CIGaussianBlur   func blur image image  UIImage  - gt  UIImage       let radius  CGFloat   20      let context   CIContext options  nil       let inputImage   CIImage CGImage  image CGImage        let filter   CIFilter name   CIGaussianBlur        filter  setValue inputImage  forKey  kCIInputImageKey       filter  setValue    radius    forKey kCIInputRadiusKey       let result   filter  valueForKey kCIOutputImageKey  as  CIImage      let rect   CGRectMake radius   2  radius   2  image size width - radius   4  image size height - radius   4      let cgImage   context createCGImage result  fromRect  rect       let returnImage   UIImage CGImage  cgImage        return returnImage

User · Answer

Here is the Swift 2 0 code for the solution that has been provided in accepted answer         only apply the blur if the user hasn t disabled transparency effects     if  UIAccessibilityIsReduceTransparencyEnabled             self view backgroundColor   UIColor clearColor            let blurEffect   UIBlurEffect style  UIBlurEffectStyle Dark          let blurEffectView   UIVisualEffectView effect  blurEffect            always fill the view         blurEffectView frame   self view bounds         blurEffectView autoresizingMask     FlexibleWidth   FlexibleHeight           self view addSubview blurEffectView    if you have more UIViews  use an insertSubview API to place it where needed       else           self view backgroundColor   UIColor blackColor

[ios] Creating a blurring overlay view

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