Question

我正在设置背景图片来查看控制器。但我也想在这个背景下添加模糊效果。我怎么能这样做？

我使用以下代码设置背景：

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

我在互联网上发现了模糊图像视图如何将其实现到我的背景中？

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

Answer 1

我已经测试了这段代码并且工作正常：

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

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)

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)

在这里你可以看到结果：

blurred view

或者您可以使用此lib：

https://github.com/FlexMonkey/Blurable

Answer 2

您可以扩展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)
    }
}

<强>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

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)
    }
}

<强>用法：

yourImageView.addBlurEffect()

<强>附录：

extension UIView {

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

Answer 3

@AlvinGeorge 应该使用：

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)
    }
}

<强>使用：

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

Answer 4

适用于Swift 3（iOS 10.0和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)

Answer 5

你也可以使用CoreImage创建带暗效果的模糊图像

为图片制作快照

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

    return UIImage()
}

按照您的意愿应用CoreImage过滤器

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()
}

Answer 6

这总是保持正确的框架：

public extension UIView {

    @discardableResult
    public func addBlur(style: UIBlurEffectStyle = .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
    }
}

Answer 7

在UIView扩展中：

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)
}

Answer 8

此代码对我来说很好！对于Swift 4.x

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

Answer 9

您应始终使用.dark样式，并添加以下代码以使其看起来很酷

    blurEffectView.backgroundColor = .black
    blurEffectView.alpha = 0.4

Answer 10

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

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

Answer 11

这对我来说适用于 Swift 5

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

Answer 12

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
                        
                    }

在swift中为背景添加模糊效果

12 个答案: