ios 快速为背景添加模糊效果

Adding blur effect to background in swift

提问by Tolgay Toklar

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?

我正在设置背景图像以查看控制器。但我也想为这个背景添加模糊效果。我怎样才能做到这一点？

I am setting background with following code:

我正在使用以下代码设置背景：

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

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

我在互联网上发现模糊图像视图如何在我的背景中实现它？

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

回答by Dharmesh Kheni

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

我已经测试了这段代码，它工作正常：

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:

对于 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:

对于 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:

在这里你可以看到结果：

Or you can use this lib for that:

或者你可以使用这个库：

https://github.com/FlexMonkey/Blurable

https://github.com/FlexMonkey/Blurable

回答by A.G

You can make an extension of UIImageView.

您可以对 UIImageView 进行扩展。

Swift 2.0

斯威夫特 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:

用法：

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

Swift 3 扩展

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:

用法：

yourImageView.addBlurEffect()

Addendum:

附录：

extension UIView {

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

回答by Blain Ellis

@AlvinGeorgeshould just use:

@AlvinGeorge应该只使用：

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

usage:

用法：

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)

回答by Rajamohan S

For Swift 3 (iOS 10.0 and 8.0)

对于 Swift 3（iOS 10.0 和 8.0）

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

    return UIImage()
}

回答by gbk

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

你也可以使用 CoreImage 来创建具有深色效果的模糊图像

1. Make snapshot for image

   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()
   }
   

2. Apply CoreImage Filters as u wish with

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

1. 为图像制作快照

   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()
   }
   

2. 随心所欲地应用 CoreImage 过滤器

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

回答by Marta

This worked for me on Swift 5

这在Swift 5上对我有用

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
    }
}

回答by J. Doe

This one always keeps the right frame:

这个总是保持正确的框架：

    blurEffectView.backgroundColor = .black
    blurEffectView.alpha = 0.4

回答by Donovan Marsh

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

您应该始终使用 .dark 作为样式并添加以下代码以使其看起来很酷

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

回答by apollovishwas

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

这段代码对我来说很好用！它适用于 Swift 4.x

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

回答by Jenel Ejercito Myers

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

找到了另一种方式..我使用苹果的 UIImage+ImageEffects。

##代码##