Swift_二维码、条形码的生成

class func generateQRCode(messgae:NSString,width:CGFloat,height:CGFloat) -> UIImage {
var returnImage:UIImage?
if (messgae.length > 0 && width > 0 && height > 0){
let inputData = messgae.data(using: String.Encoding.utf8.rawValue)! as NSData
// CIQRCodeGenerator
let filter = CIFilter.init(name: "CIQRCodeGenerator")!
filter.setValue(inputData, forKey: "inputMessage")
var ciImage = filter.outputImage!
let min = width > height ? height :width;
let scaleX = min/ciImage.extent.size.width
let scaleY = min/ciImage.extent.size.height
ciImage = ciImage.applying(CGAffineTransform.init(scaleX: scaleX, y: scaleY))
returnImage = UIImage.init(ciImage: ciImage)
}else {
returnImage = nil;
}
return returnImage!
}

class func generateQRCodeWithCenterImage(messgae:NSString,width:CGFloat,height:CGFloat,centerImage:UIImage) -> UIImage {
let backImage = generateQRCode(messgae: messgae, width: width, height: height)
UIGraphicsBeginImageContext(backImage.size);
backImage.draw(in: CGRect.init(x: 0, y: 0, width: backImage.size.width, height: backImage.size.height))
let centerImageWH:CGFloat = backImage.size.width > backImage.size.height ? backImage.size.height * 0.2 : backImage.size.width*0.2
centerImage.draw(in: CGRect.init(x: (backImage.size.width - centerImageWH)*0.5, y: (backImage.size.height - centerImageWH)*0.5, width: centerImageWH, height: centerImageWH))
let returnImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return returnImage!
}

class func generateBarCode(messgae:NSString,width:CGFloat,height:CGFloat) -> UIImage {
var returnImage:UIImage?
if (messgae.length > 0 && width > 0 && height > 0){
let inputData:NSData? = messgae.data(using: String.Encoding.utf8.rawValue)! as NSData
// CICode128BarcodeGenerator
let filter = CIFilter.init(name: "CICode128BarcodeGenerator")!
filter.setValue(inputData, forKey: "inputMessage")
var ciImage = filter.outputImage!
let scaleX = width/ciImage.extent.size.width
let scaleY = height/ciImage.extent.size.height
ciImage = ciImage.applying(CGAffineTransform.init(scaleX: scaleX, y: scaleY))
returnImage = UIImage.init(ciImage: ciImage)
}else {
returnImage = nil;
}
return returnImage!
}

class func decodeQRCode(QRCodeImage:UIImage) -> NSString {
var outputString:NSString?
let detector:CIDetector = CIDetector.init(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])!
let image = CIImage.init(image: QRCodeImage)!
let features = detector.features(in: image) as NSArray
for feature in features {
outputString = (feature as! CIQRCodeFeature).messageString! as NSString;
}
return outputString!
}