源为savedPhotosAlbum的UIImagePickerController不会显示实时照片？

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UIImagePickerController实例
        let imagePicker = UIImagePickerController()
        
        // 设置sourceType为camera
        imagePicker.sourceType = .camera
        
        // 设置delegate
        imagePicker.delegate = self
        
        // 显示UIImagePickerController
        present(imagePicker, animated: true, completion: nil)
    }
    
    // UIImagePickerControllerDelegate回调方法
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        // 处理所选照片或拍摄的照片
        let image = info[.originalImage] as? UIImage
        // 进行后续操作...
        
        // 关闭UIImagePickerController
        picker.dismiss(animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // 用户取消选择照片或拍摄照片
        // 进行相应处理...
        
        // 关闭UIImagePickerController
        picker.dismiss(animated: true, completion: nil)
    }
}