人脸识别

/// @brief The SDK event listener
/// @param listener The listener for SDK events, including AI events, tips, and resource events.
- (void)registerSDKEventListener:(id<YTSDKEventListener> _Nullable)listener;

#pragma mark - Event callback APIs
/// @brief SDK event callback APIs
@protocol YTSDKEventListener <NSObject>
/// @brief `YTDataUpdate` event callback
/// @param event: Callback in NSString* format
- (void)onYTDataEvent:(id _Nonnull)event;
/// @brief AI event callback
/// @param event: Callback in dict format
- (void)onAIEvent:(id _Nonnull)event;
/// @brief Tip event callback
/// @param event: Callback in dict format
- (void)onTipsEvent:(id _Nonnull)event;
/// @brief Resource pack event callback
/// @param event: Callback in string format
- (void)onAssetEvent:(id _Nonnull)event;
@end

- (void)onYTDataEvent:(id _Nonnull)event;

- (void)onAIEvent:(id _Nonnull)event;
   //onAIEvent callback funtion can get the data.
   NSDictionary *eventDict = (NSDictionary *)event;
    if (eventDict[@"ai_info"] != nil) {
      NSLog(@"ai_info %@",eventDict[@"ai_info"]);
    }

/// @note The list of field descriptions
/**
| Field | Type | Value Range | Description |
| :---- | :---- |:---- | :---- |
| trace_id                     | int   | [1,INF)                      | The face ID. If the faces obtained continuously from a video stream have the same face ID, they belong to the same person. |
| face_256_point               | float | [0,screenWidth] or [0,screenHeight] | 512 values in total for 256 facial keypoints. (0,0) is the top-left corner of the screen. |
| face_256_visible             | float | [0,1]                        | Visibility of the 256 facial keypoints.                  |
| out_of_screen                | bool  | true/false                   | Whether the face is outside of the screen view.                       |
| left_eye_high_vis_ratio      | float | [0,1]                               | The percentage of keypoints with high visibility for the left eye.                                    |
| right_eye_high_vis_ratio     | float | [0,1]                               | The percentage of keypoints with high visibility for the right eye.                                   |
| left_eyebrow_high_vis_ratio  | float | [0,1]                        | The percentage of keypoints with high visibility for the left eyebrow.                   |
| right_eyebrow_high_vis_ratio | float | [0,1]                        | The percentage of keypoints with high visibility for the right eyebrow.                   |
| mouth_high_vis_ratio         | float | [0,1]                               | The percentage of keypoints with high visibility for the mouth.                                     |
**/
- (void)onYTDataEvent:(id _Nonnull)event;