objective-c xcode iOS swift5 oc 高斯模糊 毛玻璃效果

文章目录

1.swift1.2 代码效果图1.2 代码

2.oc2.1 代码运行后的效果图2.2 代码

参考博客其他：我朋友的代码

1.swift

1.2 代码效果图

模糊前 模糊后

1.2 代码

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)

}

}

使用

imageView.blurEffect()

2.oc

2.1 代码运行后的效果图

2.2 代码

- (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];

}

参考博客

iOS高斯模糊实现

其他：我朋友的代码

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()

}

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