iOS开发教程之识别图片中二维码功能的实现

open class CIDetector : NSObject { // 初始化方法 public init?(ofType type: String, context: CIContext?, options: [String : Any]? = nil) // 获取识别特征 open func features(in image: CIImage) -> [CIFeature] open func features(in image: CIImage, options: [String : Any]? = nil) -> [CIFeature]}// 识别类型public let CIDetectorTypeFace: String // 面部识别public let CIDetectorTypeRectangle: String // 矩形识别public let CIDetectorTypeQRCode: String // 条码识别public let CIDetectorTypeText: String // 文本识别// 下面定义的就是options中可以传的参数public let CIDetectorAccuracy: String // 识别精度public let CIDetectorAccuracyLow: String // 低精度，识别速度快public let CIDetectorAccuracyHigh: String // 高精度，识别速度慢public let CIDetectorTracking: String // 是否开启面部追踪public let CIDetectorMinFeatureSize: String // 指定最小尺寸的检测器，小于这个尺寸的特征将不识别，CIDetectorTypeFace(0.01 ~ 0.50)，CIDetectorTypeText(0.00 ~ 1.00)，CIDetectorTypeRectangle(0.00 ~ 1.00)public let CIDetectorMaxFeatureCount: String // 设置返回矩形特征的最多个数 1 ~ 256 默认值为1public let CIDetectorNumberOfAngles: String // 设置角度的个数 1, 3, 5, 7, 9, 11public let CIDetectorImageOrientation: String // 识别方向public let CIDetectorEyeBlink: String // 眨眼特征public let CIDetectorSmile: String // 笑脸特征public let CIDetectorFocalLength: String // 每帧焦距public let CIDetectorAspectRatio: String // 矩形宽高比public let CIDetectorReturnSubFeatures: String // 文本检测器是否应该检测子特征，默认值是否

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) { // 1.取到图片 let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage // 2.生成CIImage let ciimage = CIImage(cgImage: image!.cgImage!) // 3.识别精度 let options = [CIDetectorAccuracy: CIDetectorAccuracyHigh] /** 4.创建识别器，3个参数 ofType：识别类型 CIDetectorTypeFace 面部识别 CIDetectorTypeText 文本识别 CIDetectorTypeQRCode 条码识别 CIDetectorTypeRectangle 矩形识别 context：上下文，默认传nil options：识别精度 CIDetectorAccuracyLow 低精度，识别速度快 CIDetectorAccuracyHigh 高精度，识别速度慢 */ let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: options) /** 5.获取识别结果，2个参数 in：需要识别的图片 options：需要识别的特征 CIDetectorMinFeatureSize: 指定最小尺寸的检测器，小于这个尺寸的特征将不识别，CIDetectorTypeFace(0.01 ~ 0.50)，CIDetectorTypeText(0.00 ~ 1.00)，CIDetectorTypeRectangle(0.00 ~ 1.00) CIDetectorTracking: 是否开启面部追踪 TRUE 或 FALSE CIDetectorMaxFeatureCount: 设置返回矩形特征的最多个数 1 ~ 256 默认值为1 CIDetectorNumberOfAngles: 设置角度的个数 1, 3, 5, 7, 9, 11 CIDetectorImageOrientation: 识别方向 CIDetectorEyeBlink: 眨眼特征 CIDetectorSmile: 笑脸特征 CIDetectorFocalLength: 每帧焦距 CIDetectorAspectRatio: 矩形宽高比 CIDetectorReturnSubFeatures: 文本检测器是否应该检测子特征，默认值是否 */ let features = detector?.features(in: ciimage, options: nil) // 遍历出二维码 for item in features! where item.isKind(of: CIQRCodeFeature.self) { print((item as! CIQRCodeFeature).messageString ?? "") } }