Swift 生成高清二维码 这个没有前景图片只是简单的生成普通的高清二维码

Swift 生成高清二维码 这个没有前景图片只是简单的生成普通的高清二维码

/// 二维码容器
@IBOutlet weak var customImageVivew: UIImageView!

override func viewDidLoad() {
super.viewDidLoad()
// 1.创建滤镜
let filter = CIFilter(name: "CIQRCodeGenerator")
// 2.还原滤镜默认属性
filter?.setDefaults()
// 3.设置需要生成二维码的数据到滤镜中
// OC中要求设置的是一个二进制数据
filter?.setValue("WD".dataUsingEncoding(NSUTF8StringEncoding), forKeyPath: "InputMessage")
// 4.从滤镜从取出生成好的二维码图片
guard let ciImage = filter?.outputImage else
{
return
}

//   customImageVivew.image = UIImage(CIImage: ciImage)
customImageVivew.image = createNonInterpolatedUIImageFormCIImage(ciImage, size: 500)

}

/**
生成高清二维码

- parameter image: 需要生成原始图片
- parameter size:  生成的二维码的宽高
*/
private func createNonInterpolatedUIImageFormCIImage(image: CIImage, size: CGFloat) -> UIImage {

let extent: CGRect = CGRectIntegral(image.extent)
let scale: CGFloat = min(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent))

// 1.创建bitmap;
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);

// 2.保存bitmap到图片
let scaledImage: CGImageRef = CGBitmapContextCreateImage(bitmapRef)!

return UIImage(CGImage: scaledImage)
}