ios:如何使用CGPath模糊图像?
我创建了一个CGPath区域,如绿色圆圈所示。CGPath区域需要清晰,图像的其余部分将应用模糊或半透明效果,我可以使用以下代码在CGPath内剪裁图像:ios:如何使用CGPath模糊图像?,ios,cocoa-touch,uiimage,core-graphics,Ios,Cocoa Touch,Uiimage,Core Graphics,我创建了一个CGPath区域,如绿色圆圈所示。CGPath区域需要清晰,图像的其余部分将应用模糊或半透明效果,我可以使用以下代码在CGPath内剪裁图像: UIGraphicsBeginImageContext(view.frame.size); CGContextAddPath(ctx, path); CGContextClip(ctx); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *clipIma
UIGraphicsBeginImageContext(view.frame.size);
CGContextAddPath(ctx, path);
CGContextClip(ctx);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *clipImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(clipImage, nil, nil, nil);
CGPathRelease(path);
但我不知道如何应用模糊或半透明效果与CGPath同时进行。我想我可以模糊原始图像并将其与剪辑图像合并,但我不知道如何实现它。您需要2个概念才能实现最终结果:- (一) (ii) CGBlendMode用于从图像中删除所需的部分。在当前上下文中彼此驻留的路径上的合成操作。 清除模式,其原始值为16有助于清除所需部分
CIFilter有助于模糊最终图像 任务完成了
嗨,我该怎么做呢?我希望圆圈变得模糊,其余部分变得清晰。谢谢
class ConvertToBlurryImage:UIView {
var originalImage:UIImage!
var finalImage:UIImage!
override func draw(_ rect: CGRect) {
super.draw(rect)
//Original Image
originalImage = UIImage(named: "originalImage.png")
//Intermediate Image
let intermediateImage = UIImage().returnBlurImage(image: originalImage)
//Final Result Image
finalImage = blendImage(image: intermediateImage)
let attachedImage = UIImageView(image: finalImage)
addSubview(attachedImage)
}
func blurryImage(image:UIImage) -> UIImage {
UIGraphicsBeginImageContext(frame.size)
image.draw(in: CGRect(origin: frame.origin, size: frame.size) )
// 16 === clear
let mode = CGBlendMode(rawValue: 16)
UIGraphicsGetCurrentContext()!.setBlendMode(mode!)
//Path that need to crop
pathToCrop()
let mode2 = CGBlendMode(rawValue: 16)
UIGraphicsGetCurrentContext()!.setBlendMode(mode2!)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
return finalImage!
}
func pathToCrop() {
let path = UIBezierPath(ovalIn: CGRect(x: frame.width/2 - 50, y: frame.height/2 - 100 , width: 150, height: 150) )
path.fill()
path.stroke()
}
}
extension UIImage {
func returnBlurImage(image:UIImage) -> UIImage {
let beginImage = CIImage(cgImage: image.cgImage!)
let blurfilter = CIFilter(name: "CIGaussianBlur")
blurfilter?.setValue(beginImage, forKey: "inputImage")
let resultImage = blurfilter?.value(forKey: "outputImage") as! CIImage
let blurredImage = UIImage(ciImage: resultImage)
return blurredImage
}
}