【Xcode】カメラを起動する機能を実装してみる

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, 
UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    @IBAction func camera(_ sender: UIButton) {
        let sourceType = UIImagePickerController.SourceType.camera
        // 端末でカメラが利用可能か調べる
        if UIImagePickerController.isSourceTypeAvailable(sourceType) {
            let pickerController = UIImagePickerController()
            pickerController.delegate = self
            pickerController.sourceType = sourceType
            // 利用可能な全てのmediaTypeが選択できる
            pickerController.mediaTypes = 
　　　　　　　　UIImagePickerController.availableMediaTypes(for: sourceType) ?? []

            // 動画を高画質で保存する
            pickerController.videoQuality = .typeHigh
            present(pickerController, animated: true, completion: nil)
        }
    }
    
    /*
          * 動画の撮影が完了して戻ってきたとき
          */
    func imagePickerController(_ picker: UIImagePickerController, 
　　　　　didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        picker.dismiss(animated: true, completion: nil)

        if let url = info[UIImagePickerController.InfoKey.mediaURL] as? NSURL {
                // 端末のカメラロールに保存する
            UISaveVideoAtPathToSavedPhotosAlbum(url.path!, self, nil, nil)
            }
        
        if let uiImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage {
                    // 写真ライブラリに画像を保存
            UIImageWriteToSavedPhotosAlbum(uiImage, nil,　nil,　nil)
                }
        }
}