Xcode9学习笔记83 - 图像中人物的面部检测

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.view.backgroundColor = UIColor.black
        let image = UIImage(named: "Pic6")
        let imageView = UIImageView(image: image)
        imageView.center = CGPoint(x: 185, y: 260)//设置中心点坐标
        self.view.addSubview(imageView)
        
        let ciImage = CIImage(image: image!)
        let ciContext: CIContext = { return CIContext(options: nil) }()
        let ciDetector = CIDetector(ofType: CIDetectorTypeFace, context: ciContext, options: [CIDetectorAccuracy : CIDetectorAccuracyHigh])
        
        let ciImageSize = ciImage!.extent.size
        var transform = CGAffineTransform.identity
        transform = transform.scaledBy(x: 1.0, y: -1.0)
        transform = transform.translatedBy(x: 0, y: ciImageSize.height * -1)
        
        let features: [CIFeature]! = ciDetector!.features(in: ciImage!)
        for feature in features {
            let frame = feature.bounds.applying(transform)
            let faceView = UIView(frame: frame)
            faceView.layer.borderWidth = 2
            faceView.layer.borderColor = UIColor.white.cgColor
            imageView.addSubview(faceView)
        }
    }