Swift3 如何通过操作快门按钮自动拍照

通过设置计时器，了解iphone具有自动拍照功能。在此之后，按下快门按钮开始

我想做类似的事情。因此，如何在相机启动后以编程方式处理快门按钮

- implement: UINavigationControllerDelegate, UIImagePickerControllerDelegate 

class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate  {

var imagePicker: UIImagePickerController!


}

//-- launch the camera

  @IBAction func takePhoto(_ sender: UIButton) {

        imagePicker =  UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = .camera
        present(imagePicker, animated: true, completion: nil)
    }

那么，在相机启动后，如何以编程方式处理快门按钮，比如单击它拍照

那么，在相机启动后，如何以编程方式处理快门按钮，比如单击它拍照

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告诉UIImagePickerController在哪里执行此操作？内部的按钮功能？请告诉我这是怎么做的？谢谢