iOS swift5 oc 高斯模糊毛玻璃效果

本文介绍: Di s patchQueue.global().async {[weak self] in let size = CGSize.init(width: MKSc re enU.width, height: (self?.headerIm a g eViewDe fa ul tHe i g ht)!) guard let image = img else { return } let sc.

extension UIView {
    //高斯模糊
    func blurEffect(){
        let blur = UIBlurEffect(style: .light)
        let effectView = UIVisualEffectView(effect: blur)
        effectView.frame = CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)
        addSubview(effectView)
    }
}

imageView.blurEffect()

请添加图片描述

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIImageView *imageview = [[UIImageView alloc] init];
   imageview.frame = CGRectMake(10, 100, 300, 300);
   imageview.image = [UIImage imageNamed:@"img"];
   imageview.contentMode = UIViewContentModeScaleAspectFit;
   imageview.userInteractionEnabled = YES;
   [self.view addSubview:imageview];

   UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
   UIVisualEffectView *effectview = [[UIVisualEffectView alloc] initWithEffect:blur];
   effectview.frame = CGRectMake(0, 0, imageview.frame.size.width/2, 300);

   [imageview addSubview:effectview];

   UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
   btn.frame = CGRectMake(10, 50, 100, 40);
   [btn setTitle:@"btn" forState:UIControlStateNormal];
   [effectview.contentView addSubview:btn];
    
}

iOS高斯模糊实现

DispatchQueue.global().async {[weak self] in
                        let size = CGSize.init(width: MKScreenU.width, height: (self?.headerImageViewDefaultHeight)!)
                        guard let image = img else { return }
                        let scaleDownSize = CGSize.init(width: image.size.width / 10.0, height: image.size.height / 10.0)
                        guard let originalImage = image.sd_resizedImage(with: scaleDownSize, scaleMode: .aspectFill) else { return }
                        UIGraphicsBeginImageContextWithOptions(size, true, UIScreen.main.scale)
                        // 高斯模糊
                        let gimage2 = originalImage.qh_applyGaussianBlurFilter(val: 5)
                        let scaleValue = image.size.width / size.width
                        gimage2?.draw(in: CGRect.init(x: 0, y: (size.height - (image.size.height / scaleValue)) / 2.0, width: size.width, height: image.size.height / scaleValue))
                        // 黑色遮罩
                        let path = UIBezierPath.init(rect: CGRect.init(origin: .zero, size: size))
                        UIColor.black.withAlphaComponent(0.4).setFill()
                        path.fill()
                        let resultImage = UIGraphicsGetImageFromCurrentImageContext()!
                        UIGraphicsEndImageContext()
                        SDImageCache.shared.store(resultImage, forKey: cacheKey) {

                        }
                        DispatchQueue.main.async {
                            self?.headerImageView.image = resultImage
                        }
                    }

func qh_applyGaussianBlurFilter(val: CGFloat) -> UIImage? {
        guard let aCIImage = CIImage.init(image: self) else { return nil }
        let clampFilter = CIFilter(name: "CIAffineClamp")
        clampFilter?.setDefaults()
        clampFilter?.setValue(aCIImage, forKey: kCIInputImageKey)

        let blurFilter = CIFilter(name: "CIGaussianBlur")
        blurFilter?.setValue(clampFilter?.outputImage, forKey: kCIInputImageKey)
        blurFilter?.setValue(val, forKey: kCIInputRadiusKey)

        let rect = aCIImage.extent
        if let output = blurFilter?.outputImage {
            let context = CIContext(options: nil)
            if let cgimg = context.createCGImage(output, from: rect) {
                let processedImage = UIImage(cgImage: cgimg)
                return processedImage
            }
        }
        fatalError()
    }