Starting with iOS 13, you will get a different set of points (VNDetectFaceLandmarksRequestRevision3) 

AVCaptureVideoDataOutput *output = [[[self.videoCamera captureSession] outputs] lastObject]; NSDictionary* outputSettings = [output videoSettings]; long width = [[outputSettings objectForKey:@"Width"] longValue]; long height = [[outputSettings objectForKey:@"Height"] longValue];

size_t width = CVPixelBufferGetWidth(CVPixelBufferRef); size_t height = CVPixelBufferGetHeight(CVPixelBufferRef); CGSize size = CGSizeMake(width, height); CGFloat scaleX = self.filterView.layer.frame.size.width / size.width; CGFloat scaleY = self.filterView.layer.frame.size.height / size.height; CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -1); CGRect faceBoundingBoxOnScreen = VNImageRectForNormalizedRect(CGRectApplyAffineTransform(observedFace.boundingBox, transform), size.width, size.height);

CGRect faceBoundingBoxOnScreen = CGRectZero; faceBoundingBoxOnScreen.size.height = self.filterView.layer.frame.size.height * observedFace.boundingBox.size.height; faceBoundingBoxOnScreen.size.width = self.filterView.layer.frame.size.width * observedFace.boundingBox.size.width; faceBoundingBoxOnScreen.origin.x = observedFace.boundingBox.origin.x * self.filterView.layer.frame.size.width; faceBoundingBoxOnScreen.origin.y = observedFace.boundingBox.origin.y * self.filterView.layer.frame.size.height;

for (int i = 0; i < eye.pointCount; i++) { CGPoint eyePoint = eye.normalizedPoints[i]; CGRect faceBounds = VNImageRectForNormalizedRect(screenBoundingBox, size.width, size.height); CGAffineTransform transform = CGAffineTransformScale(CGAffineTransformMakeTranslation(faceBounds.origin.x, faceBounds.origin.y), faceBounds.size.width, faceBounds.size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); CGFloat scaleX = self.filterView.layer.frame.size.width / size.width; CGFloat scaleY = self.filterView.layer.frame.size.height / size.height; transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); }

const CGPoint *pointsInImage = [eye pointsInImageOfSize:CGSizeMake(size.width, size.height)]; for (int i = 0; i < eye.pointCount; i++) { CGPoint eyePoint = pointsInImage[i]; CGFloat scaleX = self.filterView.layer.frame.size.width / size.width; CGFloat scaleY = self.filterView.layer.frame.size.height / size.height; CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); newEyePoints[i] = eyePoint; [newEyePointsArray addObject:[NSValue valueWithCGPoint:eyePoint]]; }

NSMutableArray *newAllPointsArray = [NSMutableArray array]; const CGPoint *pointsInImage = [landmarks.allPoints pointsInImageOfSize:CGSizeMake(size.width, size.height)]; for (int i = 0; i < landmarks.allPoints.pointCount; i++) { CGPoint eyePoint = pointsInImage[i]; CGFloat scaleX = (self.filterView.layer.frame.size.width / size.width) * (size.height / self.filterView.layer.frame.size.width); CGFloat scaleY = (self.filterView.layer.frame.size.height / size.height) * (size.width / self.filterView.layer.frame.size.height); CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); [newAllPointsArray addObject:[NSValue valueWithCGPoint:eyePoint]]; }

#import <GPUImage/GPUImage.h> #import "IRCameraSticker.h" #import "IRCameraStickerFilter.h" #import "IRCameraStickersManager.h" self.videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPresetHigh cameraPosition:AVCaptureDevicePositionFront]; self.videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait; self.videoCamera.horizontallyMirrorFrontFacingCamera = YES; self.videoCamera.delegate = self;

self.stickerFilter = [IRCameraStickerFilter new]; [self.videoCamera addTarget:self.stickerFilter]; self.filterView = [[GPUImageView alloc] initWithFrame:self.view.bounds]; self.filterView.fillMode = kGPUImageFillModePreserveAspectRatioAndFill; self.filterView.center = self.view.center; [self.view addSubview:self.filterView]; self.filterView.layer.frame = self.view.frame; [self.stickerFilter addTarget:self.filterView];

[self.videoCamera startCameraCapture];

[IRCameraStickersManager loadStickersWithCompletion:^(NSArray<IRCameraSticker *> *stickers) { self.stickers = stickers; self.stickerFilter.sticker = [stickers firstObject]; }];

#pragma mark - GPUImageVideoCameraDelegate - (void)willOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer { CVImageBufferRef frame = CMSampleBufferGetImageBuffer(sampleBuffer); [self detectFace:frame]; } - (void)detectFace:(CVPixelBufferRef)image { size_t width = CVPixelBufferGetWidth(image); size_t height = CVPixelBufferGetHeight(image); VNDetectFaceLandmarksRequest *faceDetectionRequest = [[VNDetectFaceLandmarksRequest alloc] initWithCompletionHandler:^(VNRequest * _Nonnull request, NSError * _Nullable error) { dispatch_async(dispatch_get_main_queue(), ^{ if ([request.results isKindOfClass:[NSArray<VNFaceObservation *> class]]) { [self handleFaceDetectionResults:request.results size:CGSizeMake(width, height)]; } else { [self clearDrawings]; } }); }]; VNImageRequestHandler *imageRequestHandler = [[VNImageRequestHandler alloc] initWithCVPixelBuffer:image orientation:kCGImagePropertyOrientationLeftMirrored options:0]; [imageRequestHandler performRequests:@[faceDetectionRequest] error:nil]; } - (void)handleFaceDetectionResults:(NSArray<VNFaceObservation *> *)observedFaces size:(CGSize)size { [self clearDrawings]; NSMutableArray<CAShapeLayer *> *facesBoundingBoxes = [NSMutableArray array]; for (VNFaceObservation *observedFace in observedFaces) { if (observedFace.landmarks) { [newDrawings addObjectsFromArray:[self drawFaceFeatures:observedFace.landmarks WithBoundingBox:observedFace.boundingBox size:size]]; } [facesBoundingBoxes addObjectsFromArray:newDrawings]; for (CAShapeLayer *faceBoundingBox in facesBoundingBoxes) { [self.filterView.layer addSublayer:faceBoundingBox]; } self.drawings = facesBoundingBoxes; } } - (void)clearDrawings { for (CAShapeLayer *drawing in self.drawings) { [drawing removeFromSuperlayer]; } } - (NSMutableArray<CAShapeLayer *> *)drawFaceFeatures:(VNFaceLandmarks2D *)landmarks WithBoundingBox:(CGRect)screenBoundingBox size:(CGSize)size { NSMutableArray<CAShapeLayer *> *faceFeaturesDrawings = [NSMutableArray array]; if (landmarks.allPoints) { NSMutableArray *newAllPointsArray = [NSMutableArray array]; const CGPoint *pointsInImage = [landmarks.allPoints pointsInImageOfSize:CGSizeMake(size.width, size.height)]; for (int i = 0; i < landmarks.allPoints.pointCount; i++) { CGPoint eyePoint = pointsInImage[i]; CGFloat scaleX = (self.filterView.layer.frame.size.width / size.width) * (size.height / self.filterView.layer.frame.size.width); CGFloat scaleY = (self.filterView.layer.frame.size.height / size.height) * (size.width / self.filterView.layer.frame.size.height); CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); [newAllPointsArray addObject:[NSValue valueWithCGPoint:eyePoint]]; } self.stickerFilter.faces = @[newAllPointsArray]; } return faceFeaturesDrawings; } 

CGFloat scaleX = self.filterView.layer.frame.size.width / size.width; CGFloat scaleY = self.filterView.layer.frame.size.height / size.height; CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -1); CGRect faceBoundingBoxOnScreen = VNImageRectForNormalizedRect(CGRectApplyAffineTransform(observedFace.boundingBox, transform), size.width, size.height); CGPathRef faceBoundingBoxPath = CGPathCreateWithRect(faceBoundingBoxOnScreen, nil); CAShapeLayer *faceBoundingBoxShape = [CAShapeLayer layer]; faceBoundingBoxShape.path = faceBoundingBoxPath; faceBoundingBoxShape.fillColor = [UIColor clearColor].CGColor; faceBoundingBoxShape.strokeColor = [UIColor greenColor].CGColor; NSMutableArray<CAShapeLayer *> *newDrawings = [NSMutableArray array]; [newDrawings addObject:faceBoundingBoxShape];

... if (landmarks.leftEye) { CAShapeLayer *eyeDrawing = [self drawEye:landmarks.leftEye WithBoundingBox:screenBoundingBox size:size]; [faceFeaturesDrawings addObject:eyeDrawing]; } if (landmarks.rightEye) { CAShapeLayer *eyeDrawing = [self drawEye:landmarks.rightEye WithBoundingBox:screenBoundingBox size:size]; [faceFeaturesDrawings addObject:eyeDrawing]; } ... - (CAShapeLayer *)drawEye:(VNFaceLandmarkRegion2D *)eye WithBoundingBox:(CGRect)screenBoundingBox size:(CGSize)size { CGMutablePathRef eyePath = CGPathCreateMutable(); CGPoint *newEyePoints = malloc(sizeof(CGPoint) * eye.pointCount); NSMutableArray *newEyePointsArray = [NSMutableArray array]; const CGPoint *pointsInImage = [eye pointsInImageOfSize:CGSizeMake(size.width, size.height)]; for (int i = 0; i < eye.pointCount; i++) { CGPoint eyePoint = pointsInImage[i]; CGFloat scaleX = self.filterView.layer.frame.size.width / size.width; CGFloat scaleY = self.filterView.layer.frame.size.height / size.height; CGAffineTransform transform = CGAffineTransformTranslate(CGAffineTransformMakeScale(scaleX, -scaleY), 0, -size.height); eyePoint = CGPointApplyAffineTransform(eyePoint, transform); newEyePoints[i] = eyePoint; [newEyePointsArray addObject:[NSValue valueWithCGPoint:eyePoint]]; } CGPathAddLines(eyePath, nil, newEyePoints, eye.pointCount); CGPathCloseSubpath(eyePath); CAShapeLayer *eyeDrawing = [CAShapeLayer layer]; eyeDrawing.anchorPoint = CGPointMake(0.5, 0.5); eyeDrawing.position = CGPointMake(size.width / 2, size.height / 2); eyeDrawing.bounds = CGRectMake(0, 0, size.width, size.height); eyeDrawing.path = eyePath; eyeDrawing.fillColor = [UIColor clearColor].CGColor; eyeDrawing.strokeColor = [UIColor greenColor].CGColor; return eyeDrawing; }