如何在photoLibrary UIimgaePickerController swift中筛选扩展

我只想在图书馆里有一种类型的视频。使用默认库。我的应用程序当前正在使用UIImagePickerController.photoLibrary从应用程序文档目录拍摄图像和视频。我只想显示一种视频类型

import AVFoundation
import MobileCoreServices
import Photos
import UIKit

 class CameraLibraryTestViewController: UIViewController {
        @IBOutlet weak var imgView: UIImageView!

        let picker = UIImagePickerController()


        override func viewDidLoad() {
            super.viewDidLoad()


        }

        @IBAction func bAction(_ sender: Any) {
            picker.mediaTypes = ["public.image", "public.mp4"] // filter extesion mp4 didn't work, 
            picker.sourceType = .photoLibrary
            picker.allowsEditing = false
            picker.delegate = self

            present(picker, animated: true)
        }
    }



    extension CameraLibraryTestViewController: UINavigationControllerDelegate, UIImagePickerControllerDelegate {
        public func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            dismiss(animated: true, completion: nil)
        }

        func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
            viewController.navigationItem.title = "Jeri Library"
            picker.setEditing(false, animated: true)
            print("test or check: \(viewController.debugDescription)")
        }

        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
            let assetPath = info[UIImagePickerControllerReferenceURL] as! NSURL

            if (assetPath.absoluteString?.hasSuffix("MOV"))! {
                print("MOV")
                dismiss(animated: true) {
                    self.navigationController?.pushViewController(EmojiReadViewController(), animated: true)
                }
            }
            else if (assetPath.absoluteString?.hasSuffix("MP4"))! {
                print("MP4")
                dismiss(animated: true) {
                    self.navigationController?.pushViewController(EmojiReadViewController(), animated: true)
                }
            }
            else if (assetPath.absoluteString?.hasSuffix("M4V"))! {
                print("M4V")
                dismiss(animated: true) {
                    self.navigationController?.pushViewController(EmojiReadViewController(), animated: true)
                }
            }
            else {
                print("Unknown")
                dismiss(animated: true, completion: nil)
            }
        }
    }

我尝试使用mediaType[kUTTypeMPEG4 as String]，但仍然不起作用，这是在didFinishPickingMediaWithInfo中，它仅用于从库中选择后的过滤器

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如果我使用kUTTypeMovie，它会获取本地存储中的所有视频

这将只显示视频

picker.mediaTypes = [ "public.movie"]

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你解决了吗？@EssamMohamed在2018年解决了，谢谢让_extension=posibleVideoURL.pathExtension.lowercased如果_extension==mov | | | u extension==mp4{}在哪里写这些行？他只要求mp4视频！