Since the event is not notified as usual, print is not performed either.

"ThumbnailCell.m" and "ThumbnailView.m" -(void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event -(void) touchesBegan: (NSSet *) touches withEvent: (UIEvent *) event -(void) touchesMoved: (NSSet *) touches withEvent: (UIEvent *) event -(void) touchesCancelled: (NSSet *) touches withEvent: (UIEvent *) event A breakpoint is set in, and the thumbnail displayed on the actual iPad (iOS 15.1) is touched for testing. While "ThumbnailCell.m" can get notifications of touch events, Touch event notifications cannot be obtained with "ThumbnailView.m".

It's old code https://github.com/naonya3/LMImagesPickerController It will be the code created by diverting. You can check the operation in this project.