PS: 一直忙着解决提审上线问题,终于下下来精心整理下以前写的东西了,最近苹果审核槽点太多. 感觉不爱了.
import AVFoundation
//MARK: -二维码图片生成以及识别
extension QRCodeTool{
//MARK: -生成二维码图片
@objc class func encodeQrString(_ infoDic:[String:Any])->CIImage{
//infoDicNew 为二维码内需要包含的信息
// 1.创建过滤器，这里的@"CIQRCodeGenerator"是固定的
let filter = CIFilter.init(name: "CIQRCodeGenerator")
// 2.恢复默认设置
filter?.setDefaults()
// 3. 给过滤器添加数据
var infoJsonStr = infoDic转成的jsonstring
var charset = CharacterSet.urlHostAllowed
charset.remove(charactersIn: "+")
charset.remove(charactersIn: "=")
let urlPrefix = "Associated Domains" 或者 app 的 scheme://
//按需要拼接,如果项目配置了通用链接(Universal
Links)的话,可以让server配置个默认落地页,直接二维码识别出url可以跳转到落地页展示app或者直接跳转到你的app,关于通用链接的说明我就不写了,别人写的挺好的.可参照http://www.cocoachina.com/ios/20150902/13321.html
let urlSuffix = infoJsonStr(infoJsonStr 可做加密)
let urlStr = urlPrefix + urlSuffix
let qrcodeData = urlStr.data(using: String.Encoding.utf8)
filter?.setValue(qrcodeData, forKey: "inputMessage")
// 4. 生成二维码图片
return filter!.outputImage!
}
//MARK: -识别图片 成功结果为空时表明识别失败
class func scan(img:UIImage?)->String?{
if img == nil{
//二维码图片为空
return nil;
}
let detector = CIDetector.init(ofType: CIDetectorTypeQRCode,
context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])
// 识别二维码取得识别结果
//先识别原图片
var features = detector?.features(in: CIImage.init(cgImage: img!.cgImage!))
//messageString
var resultStr:String?
if (features?.count ?? 0) == 0{
//识别失败,放大的二维码图片并识别
let image = screenSizeImage(with: img!)
features = detector?.features(in: CIImage.init(cgImage:image!.cgImage!))
if (features?.count ?? 0) > 0{
if let feature = features![0] as? CIQRCodeFeature{
resultStr = feature.messageString
}
}
} else {
for feature in features!{
if feature.type == CIFeatureTypeQRCode {
resultStr = (feature as? CIQRCodeFeature)?.messageString
break;
}
}
}
return resultStr
}
// 放大二维码图片
class func screenSizeImage(with image:UIImage)->UIImage{
let imageWidth = image.size.width
let imageHeight = image.size.height
if (imageWidth <= kScreenWidth && imageHeight <= kScreenHeight) {
return image;
}
let maxWH = max(imageWidth, imageHeight)
let scale = maxWH / (kScreenHeight * 2.0)
let size = CGSize(width:imageWidth / scale, height: imageHeight / scale)
UIGraphicsBeginImageContext(size);
image.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))
let newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage ?? UIImage()
}
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