ios - 分享视频到 Facebook - Swift IOS

Question

我正在编写一个应用程序来尝试将视频发布到 Facebook。理想情况下，我想从 Parse 中提取视频，并将其转换为 NSURL。现在我正在尝试使用 ImagePicker 来选择要分享的照片。

现在我显示了 ImagePicker，但出现了两个错误。 1)只有照片出现在滚动中，并且 2)我在 didFinishPickingMediaWithInfo 函数中得到“在展开可选值时发现 nil”。对于问题 1，我已将 UIImagePickerControllerSourceType 更改为 .PhotoLibrary，但它仍然省略了视频。

  override func viewWillAppear(animated: Bool) {
     let profileButton = UIBarButtonItem(image: img, style: .Done, target: self, action: "videoBtnClicked")
     self.navigationItem.setRightBarButtonItem(profileButton, animated: true)

  func videoBtnClicked(){
      if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
          print("Video capture")
          imagePicker.delegate = self
          imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
          imagePicker.allowsEditing = false
          self.presentViewController(imagePicker, animated: true, completion: nil)
        }
    }

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
      let video : FBSDKShareVideo = FBSDKShareVideo()
          //error occurs line below here       
          video.videoURL = info[UIImagePickerControllerMediaURL] as! NSURL
      let content : FBSDKShareVideoContent = FBSDKShareVideoContent()
      content.video = video
    }

Answer 1

1. 只有照片的问题

func videoBtnClicked(){
  if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
      print("Video capture")
      imagePicker.delegate = self
      imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum
      **imagePicker.mediaTypes = ["public.movie"]**
      imagePicker.allowsEditing = false
      self.presentViewController(imagePicker, animated: true, completion: nil)
    }
}

1. 对于第二个问题，你应该先检查url

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {      
  let video : FBSDKShareVideo = FBSDKShareVideo()
      //error occurs line below here       
  if let url = video.videoURL{
      video.videoURL = info[UIImagePickerControllerMediaURL] as? NSURL
      let content : FBSDKShareVideoContent = FBSDKShareVideoContent()
      content.video = video
  }
}