- (BOOL)checkImageHasFace  
    {  
        BOOL hasFace = NO;  
        CIImage *begingImage = [[CIImage alloc] initWithImage:_postImage];  
        //創(chuàng)建CIDetector對(duì)象，options使用NSDictionary設(shè)置采用高品質(zhì)還是低品質(zhì)，這里使用低品質(zhì)。  
        CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyLow forKey:CIDetectorAccuracy]];  
        //返回?cái)?shù)組中包含圖片臉部特征信息  
        NSArray *faceFeatures = [detector featuresInImage:begingImage];  
        for (CIFaceFeature *faceFeature in faceFeatures) {  
            //左眼位置、右眼位置和嘴的位置  
            if (faceFeature.hasLeftEyePosition&&faceFeature.hasRightEyePosition&&faceFeature.hasMouthPosition) {  
                hasFace = YES;  
            }  
        }  
        return hasFace;  
    }  

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