swift系统自带二维码的生成

概述//MARK: -传进去字符串,生成二维码图片 private func creatQRCodeImage(text: String) -> UIImage{          //创建滤镜     let filter = CIFilter(name: "CIQRCodeGenerator")    //还原滤镜的默认属性     filter?.setDefaults()    //设置需要生

//MARK: -传进去字符串,生成二维码图片

private func creatQRCodeImage(text: String) -> UIImage{

//创建滤镜

let filter = CIFilter(name: "CiqrCodeGenerator")

//还原滤镜的默认属性

filter?.setDefaults()

//设置需要生成二维码的数据

filter?.setValue(text.dataUsingEnCoding(NSUTF8StringEnCoding),forKey: "inputMessage")

//从滤镜中取出生成的图片

let ciImage = filter?.outputimage

//这个清晰度不好

//let bgImage = UIImage(CIImage: ciImage!)

//这个清晰度好

let bgImage = createNonInterpolatedUIImageFormCIImage(ciImage!,size: 300)

//创建一个头像

let icon = UIImage(named: "navigationbar_pop_highlighted")

//合成图片(把二维码和头像合并)

let newImage = creatimage(bgImage,iconImage: icon!)

//返回生成好的二维码

return newImage

}

//MARK: - 根据背景图片和头像合成头像二维码

private func creatimage(bgImage: UIImage,iconImage:UIImage) -> UIImage{

//开启图片上下文

UIGraphicsBeginImageContext(bgImage.size)

//绘制背景图片

bgImage.drawInRect(CGRect(origin: CGPointZero,size: bgImage.size))

//绘制头像

let wIDth: CGfloat = 50

let height: CGfloat = wIDth

let x = (bgImage.size.wIDth - wIDth) * 0.5

let y = (bgImage.size.height - height) * 0.5

iconImage.drawInRect(CGRect(x: x,y: y,wIDth: wIDth,height: height))

//取出绘制好的图片

let newImage = UIGraphicsGetimageFromCurrentimageContext()

//关闭上下文

UIGraphicsEndImageContext()

//返回合成好的图片

return newImage

}

//MARK: -根据CIImage生成指定大小的高清UIImage

private func createNonInterpolatedUIImageFormCIImage(image: CIImage,size: CGfloat) -> UIImage {

let extent: CGRect = CGRectIntegral(image.extent)

let scale: CGfloat = min(size/CGRectGetWIDth(extent),size/CGRectGetHeight(extent))

let wIDth = CGRectGetWIDth(extent) * scale

let height = CGRectGetHeight(extent) * scale

let cs: CGcolorSpaceRef = CGcolorSpaceCreateDeviceGray()!

let bitmapRef = CGBitmapContextCreate(nil,Int(wIDth),Int(height),8,cs,0)!

let context = CIContext(options: nil)

let bitmAPImage: CGImageRef = context.createCGImage(image,fromrect: extent)

CGContextSetInterpolationQuality(bitmapRef,CGInterpolationQuality.None)

CGContextScaleCTM(bitmapRef,scale,scale);

CGContextDrawImage(bitmapRef,extent,bitmAPImage);

let scaledImage: CGImageRef = CGBitmapContextCreateImage(bitmapRef)!

return UIImage(CGImage: scaledImage)

}

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