[英]Adding blur effect to background in swift
我正在设置背景图片以查看 controller。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?
我正在使用以下代码设置背景:
self.view.backgroundColor = UIColor(patternImage: UIImage(named: "testBg")!)
我在 inte.net 上找到了 blur imageview 我怎样才能将它应用到我的背景中?
var darkBlur = UIBlurEffect(style: UIBlurEffectStyle.Dark)
// 2
var blurView = UIVisualEffectView(effect: darkBlur)
blurView.frame = imageView.bounds
// 3
imageView.addSubview(blurView)
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)
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:
或者你可以使用这个库:
您可以对 UIImageView 进行扩展。
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)
}
}
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 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)
}
}
用法:
yourImageView.addBlurEffect()
附录:
extension UIView {
/// Remove UIBlurEffect from UIView
func removeBlurEffect() {
let blurredEffectViews = self.subviews.filter{$0 is UIVisualEffectView}
blurredEffectViews.forEach{ blurView in
blurView.removeFromSuperview()
}
}
斯威夫特 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)
}
}
@AlvinGeorge应该只使用:
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)
}
}
用法:
blurredBackground.frame = self.view.bounds
blurredBackground.blurImage()
self.view.addSubview(self.blurredBackground)
对于 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)
你也可以使用 CoreImage 来创建具有深色效果的模糊图像
为图像制作快照
func snapShotImage() -> UIImage { UIGraphicsBeginImageContext(self.frame.size) if let context = UIGraphicsGetCurrentContext() { self.layer.renderInContext(context) let image = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() return image } return UIImage() }
随心所欲地应用 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() }
这在Swift 5上对我有用
let blurredView = UIVisualEffectView(effect: UIBlurEffect(style: .light))
blurredView.frame = self.view.bounds
backgroundimage.addSubview(blurredView)
这个总是保持正确的框架:
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
}
}
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
blurEffectView.backgroundColor = .black
blurEffectView.alpha = 0.4
这段代码对我来说很好用! 它适用于 Swift 4.x
let blurEffect = UIBlurEffect(style: .ExtraLight)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = self.view.frame
self.view.insertSubview(blurEffectView, atIndex: 0)
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)
}
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
}
找到了另一种方式..我使用苹果的 UIImage+ImageEffects。
UIImage *effectImage = [image applyExtraLightEffect];
self.imageView.image = effectImage;
感谢@Maruta https://stackoverflow.com/a/56334283/16457129的回答如果有人问,你可以用视图的背景颜色减少模糊效果。
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) }
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