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import PhotosUI
class ViewController: UIViewController {
    @IBOutlet weak var imageView: UIImageView!
    @IBAction func selectButtonTouchUpInside(_ sender: Any) {
        // ライブラリ権限取得 別途Privacy - Photo Library Usage Descriptionの設定を行なってください
        if PHPhotoLibrary.authorizationStatus() != .authorized {
            PHPhotoLibrary.requestAuthorization { status in
                switch status {
                case .notDetermined, .denied:
                    self.appearChangeStatusAlert()
                case .authorized:
                    self.showPicker()
                default:
                    break
                }
            }
        }
        else {
            showPicker()
        }
    }
    private func appearChangeStatusAlert() {
        // アクセス権限が取れなかった場合に表示
        let alert = UIAlertController(title: "ライブラリが開けませんでした", message: "設定からフォトライブラリへのアクセスを許可してください", preferredStyle: .alert)
        let settingAction = UIAlertAction(title: "設定", style: .default, handler: { (_) in
            guard let settingUrl = URL(string: UIApplication.openSettingsURLString) else { return }
            UIApplication.shared.open(settingUrl, options: [:], completionHandler: nil)
        })
        let closeAction = UIAlertAction(title: "キャンセル", style: .cancel, handler: nil)
        alert.addAction(settingAction)
        alert.addAction(closeAction)
        self.present(alert, animated: true, completion: nil)
    }
    private func showPicker() {
        // PHPickerViewControllerを表示
        DispatchQueue.main.async {
            var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
            configuration.filter = .videos
            configuration.selectionLimit = 1
            configuration.preferredAssetRepresentationMode = .current
            let picker = PHPickerViewController(configuration: configuration)
            picker.delegate = self
            self.present(picker, animated: true, completion: nil)
        }
    }
}

extension ViewController: PHPickerViewControllerDelegate {
    func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
        guard let provider = results.first?.itemProvider else { return }
        guard let typeIdentifier = provider.registeredTypeIdentifiers.first else { return }
        picker.dismiss(animated: true, completion: nil)
        if provider.hasItemConformingToTypeIdentifier(typeIdentifier) {
            provider.loadFileRepresentation(forTypeIdentifier: typeIdentifier) { (url, error) in
                if let error = error { print("*** error: \(error)") }
                if let url = url {
                    // サムネイル生成
                    let avAsset = AVAsset(url: url)
                    let generator = AVAssetImageGenerator(asset: avAsset)
                    generator.appliesPreferredTrackTransform = true
                    generator.requestedTimeToleranceAfter = .zero
                    generator.requestedTimeToleranceBefore = .zero
                    let duration = avAsset.duration
                    let seconds = 5.0 // 5秒で指定
                    let time = CMTime(seconds: seconds, preferredTimescale: duration.timescale)
                    let capturedImage = try! generator.copyCGImage(at: time, actualTime: nil)
                    let image = UIImage(cgImage: capturedImage)
                    DispatchQueue.main.async {
                        // 取得したimageを表示
                        self.imageView.image = image
                    }
                }
            }
        }
    }
}