学步园

本文来自【小编我】

有遇到这种问题吗？需要显示头像，但是需要让人脸居中。

当然会有第三方，不过比较简便的是使用CoreImage，apple自带的API。

下面直接分享Demo  Demo下载地址点击即可获得

核心代码：

   CIDetector* detector = [CIDetector detectorOfType:CIDetectorTypeFace
                                                   context:nil
                                                   options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyLow
                                                                                       forKey:CIDetectorAccuracy]];
         
         NSArray* features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
         for(CIFaceFeature* faceFeature in features)
         {
             CGRect origRect = faceFeature.bounds;
             CGRect biggerRect = CGRectInset(origRect
                                             ,origRect.size.width*-0.5
                                             ,origRect.size.height*-0.5);
             
             CGRect flipRect = biggerRect;
             flipRect.origin.y = image.size.height - (biggerRect.origin.y + biggerRect.size.height);
             flipRect.origin.y = flipRect.origin.y - 4;
             
             CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], flipRect);
             UIImage* faceImage = [UIImage imageWithCGImage:imageRef];
             CGImageRelease(imageRef);
             
             photoImageView.image = faceImage;
             
             break;
         }

运行结果如下：