detect the completion of a camera shoot

I implemented the camera using the UIImagePickerController, but how do I detect that the camera shooting is over?Can't I use the UIImagePickerController?"When I tried to use the article ""How to use AVCaptureStillImageOutput"" on the following site, I was able to detect that the camera shooting was over, but it is no longer the default camera UI for iOS."
http://dev.classmethod.jp/smartphone/ios-camera-intro/

If possible, I would like to use the default camera, so would it be possible to implement it with the UIImagePickerController?
Please let me know if anyone knows.I'm sorry, but I appreciate your cooperation.