Swift中自动生成中间带小头像的二维码
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//MARK: -传进去字符串,生成二维码图片
private func creatQRCodeImage(text: String, sizeH:CGFloat) -> UIImage{
//text是二维码要带入的信息,sizeH是二维码的高度
//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: sizeH)
//创建一个头像
let icon = UIImage(named: "icon")
//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, 即是中间带头像的二维码
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, 0, 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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