- iOS 7.0+
- Xcode 7.3

self.videoCamera = [[MTFaceDetectorCamera alloc] init];
[self.videoCamera openFaceDetector];

// 在代理方法中返回人脸数据
- (void)faceDetectorCaptureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
	// 数据处理
}

// 每一个人脸框的Rect
CGRect rect = [MTCalculateFaceRect calculateFaceRectWithFaceObject:faceObj 
														parentView:self.filterImageView
														outputImageOrientation:[[UIApplication sharedApplication] statusBarOrientation]                                                           	cameraPosition:self.videoCamera.cameraPosition
														cameraMirror:self.videoCamera.horizontallyMirrorFrontFacingCamera];
										

// 显示人脸框（优化过的）										
[[MTFaceViewManager shareFaceViewManager] showFaceViewAtIndex:index faceCount:metadataObjects.count rect:rect parentView:self.filterImageView];

// 隐藏所有的人脸框
[[MTFaceViewManager shareFaceViewManager] hideAllFaceViewWithParentView:self.filterImageView];