- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];

    imageView.image = [UIImage imageNamed:@"timg.jpeg"];

    [self.view addSubview:imageView];

    CGFloat width = imageView.image.size.width;

    CGFloat height = imageView.image.size.height;

    CGFloat sWidth = imageView.bounds.size.width;

    CGFloat sHeight = imageView.bounds.size.height;

    CGFloat x = width/sWidth;

    CGFloat y = height/sHeight;

    // 根据image修改imageview的frame

    if (x > y)

    {

        imageView.frame = CGRectMake(, (sHeight-height/x)/, sWidth, height/x);

    }else{

        imageView.frame = CGRectMake((sWidth-width/y)/, , width/y, sHeight);

    }

    // 压缩image

    UIGraphicsBeginImageContext(CGSizeMake(imageView.bounds.size.width , imageView.bounds.size.height));

    [imageView.image drawInRect:CGRectMake(, , imageView.bounds.size.width, imageView.bounds.size.height)];

    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    imageView.image = scaledImage;

    //识别

    dispatch_async(dispatch_get_global_queue(, ), ^{

        CIImage *cImage = [CIImage imageWithCGImage:imageView.image.CGImage];

        // 设置识别模式

        NSDictionary  *opts = [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh

                                                          forKey:CIDetectorAccuracy];

        /* Lower accuracy, higher performance */

        //CORE_IMAGE_EXPORT NSString* const CIDetectorAccuracyLow NS_AVAILABLE(10_7, 5_0);

        /* Lower performance, higher accuracy */

        //CORE_IMAGE_EXPORT NSString* const CIDetectorAccuracyHigh NS_AVAILABLE(10_7, 5_0);

        CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace

                                                  context:nil

                                                  options:opts];

        NSArray *features = [detector featuresInImage:cImage];

        if ([features count] == )

        {

            dispatch_async(dispatch_get_main_queue(), ^{

                NSLog(@"检测失败");

            });

            return ;

        }

        for (CIFaceFeature *feature in features)

        {

            // 是否微笑

            BOOL smile = feature.hasSmile;

            NSLog(smile ? @"微笑" : @"没微笑");

            // 眼睛是否睁开

            BOOL leftEyeClosed = feature.leftEyeClosed;

            BOOL rightEyeClosed = feature.rightEyeClosed;

            NSLog(leftEyeClosed ? @"左眼没睁开" : @"左眼睁开");

            NSLog(rightEyeClosed ? @"右眼没睁开" : @"右眼睁开");

            // 获取脸部frame

            CGRect rect = feature.bounds;

            rect.origin.y = imageView.bounds.size.height - rect.size.height - rect.origin.y;// Y轴旋转180度

            faceRect = rect;

            NSLog(@"脸 %@",NSStringFromCGRect(rect));

            // 左眼

            if (feature.hasLeftEyePosition)

            {

                CGPoint eye = feature.leftEyePosition;

                eye.y = imageView.bounds.size.height - eye.y;// Y轴旋转180度

                NSLog(@"左眼 %@",NSStringFromCGPoint(eye));

            }

            // 右眼

            if (feature.hasRightEyePosition)

            {

                CGPoint eye = feature.rightEyePosition;

                eye.y = imageView.bounds.size.height - eye.y;// Y轴旋转180度

                NSLog(@"右眼 %@",NSStringFromCGPoint(eye));

            }

            // 嘴

            if (feature.hasMouthPosition)

            {

                CGPoint mouth = feature.mouthPosition;

                mouth.y = imageView.bounds.size.height - mouth.y;// Y轴旋转180度

                NSLog(@"嘴 %@",NSStringFromCGPoint(mouth));

            }

        }

        dispatch_async(dispatch_get_main_queue(), ^{

            NSLog(@"检测完成");

            UIView *view = [[UIView alloc] initWithFrame:faceRect];

            view.backgroundColor = [UIColor blueColor];

            view.alpha = 0.3;

            [imageView addSubview:view];

        });

    });

}