UIImagePickerController 未启动下一个功能

Question

我正在使用 Swift 5 并将 MessageKit 集成到我的应用程序中。这是预期的功能：

User selects the image via picker

uploadImage function is initiated

Image is uploaded and displayed

实际情况：

User selects the image via picker

Nothing happens from there.

我没有收到任何错误消息。我已经输入打印语句以查看它是否甚至进入了 uploadImage() 函数，但它没有启动。我已将 uipickerimagecontroller 代码更改为我应用程序其他地方的确切代码，这些代码正在运行，甚至没有启动该功能。我知道我的代码不漂亮，但我仍在学习（请不要评判大声笑）。谁能帮忙：

变量设置

private var isSendingPhoto = true {
  didSet {
    DispatchQueue.main.async {
      self.messageInputBar.leftStackViewItems.forEach { item in
        item.inputBarAccessoryView?.isUserInteractionEnabled = !self.isSendingPhoto
      }
    }
  }
}

ViewDidLoad

    messagesCollectionView.messagesDataSource = self
    messagesCollectionView.messagesLayoutDelegate = self
    messageInputBar.delegate = self as? InputBarAccessoryViewDelegate
    messagesCollectionView.messagesDisplayDelegate = self
    title = "MaybeDrinks"

    // 1
    let cameraItem = InputBarButtonItem(type: .system)
    cameraItem.tintColor = .primary
    cameraItem.image = #imageLiteral(resourceName: "camera")

    // 2
    cameraItem.addTarget(
      self,
      action: #selector(cameraButtonPressed),
      for: .primaryActionTriggered
    )
    cameraItem.setSize(CGSize(width: 60, height: 30), animated: false)

    messageInputBar.leftStackView.alignment = .center
    messageInputBar.setLeftStackViewWidthConstant(to: 50, animated: false)
    messageInputBar.setStackViewItems([cameraItem], forStack: .left, animated: false) // 3
}

    private func sendPhoto(_ image: UIImage) {
          isSendingPhoto = true

          uploadImage(image) { [weak self] url in
            guard let `self` = self else {
              return
            }
            self.isSendingPhoto = false

            guard let url = url else {
              return
            }

            var message = Message(messageuser: self.sender, image: image)
            message.downloadURL = url

            self.save(message)
            self.messagesCollectionView.scrollToBottom()
          }
        }
    func imagePickerController(_ picker: UIImagePickerController,
                                   didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
          picker.dismiss(animated: true, completion: nil)

          // 1
          if let asset = info[.phAsset] as? PHAsset {
            let size = CGSize(width: 500, height: 500)
            PHImageManager.default().requestImage(
              for: asset,
              targetSize: size,
              contentMode: .aspectFit,
              options: nil) { result, info in
                print("I'm in image picker")
              guard let image = result else {
                return
              }

              self.sendPhoto(image)
            }

          // 2
          } else if let image = info[.originalImage] as? UIImage {
            sendPhoto(image)
          }
        }

        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
          picker.dismiss(animated: true, completion: nil)
        }
        // MARK: - Actions

        @objc private func cameraButtonPressed() {
          let picker = UIImagePickerController()
            picker.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate
          picker.allowsEditing = true

          if UIImagePickerController.isSourceTypeAvailable(.camera) {
            picker.sourceType = .camera
          } else {
            picker.sourceType = .photoLibrary
          }

          present(picker, animated: true, completion: nil)
        }

上传图片功能

private func uploadImage(_ image: UIImage, completion: @escaping (URL?) -> Void) {
  print("im in upload")

  // STEP 1. Declare URL, Request and Params
  let url = URL(string: "https://localhost/messagepost.php")!

  // declaring reqeust with further configs
  var request = URLRequest(url: url)

  // POST - safest method of passing data to the server
  request.httpMethod = "POST"

         // values to be sent to the server under keys (e.g. ID, TYPE)
  let params = ["sender_id": user_id, "uuid": uuid, "sender": me, "recipient_id": rid, "recipient": recipient, "puuid": puuid]

  // body
  let boundary = "Boundary-\(UUID().uuidString)"
  request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

  // Compressing image and converting image to 'Data' type
  guard let scaledImage = image.scaledToSafeUploadSize,
    let data = scaledImage.jpegData(compressionQuality: 0.4) else {
    return
  }

  // assigning full body to the request to be sent to the server
  request.httpBody = createBodyWithParams(params, filePathKey: "file", imageDataKey: data, boundary: boundary)
    print(request.httpBody as Any, "\(puuid).jpg")

  URLSession.shared.dataTask(with: request) { (data, response, error) in
      DispatchQueue.main.async {

          // error occured
          if error != nil {
              Helper().showAlert(title: "Server Error", message: error!.localizedDescription, in: self)
              return
          }


          do {

              // save mode of casting any data
              guard let data = data else {
                  Helper().showAlert(title: "Data Error", message: error!.localizedDescription, in: self)
                  return
              }

              // fetching JSON generated by the server - php file
              let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as? NSDictionary

              // save method of accessing json constant
              guard let parsedJSON = json else {
                  return
              }

              // uploaded successfully
              if parsedJSON["status"] as! String == "200" {
                let newurl = parsedJSON["path"]
                print("did you upload", newurl as Any)
                print("did you upload", parsedJSON["message"] as Any)
                self.isSendingPhoto = true
                  guard let url = newurl else {
                    return
                  }
                  //uploadImage(image)
                var message = Message(messageuser: self.sender, image: image)
                message.downloadURL = url as? URL

                    self.save(message)
                    self.messagesCollectionView.scrollToBottom()


              } else {

                  // show the error message in AlertView
                  if parsedJSON["message"] != nil {
                      let message = parsedJSON["message"] as! String
                      Helper().showAlert(title: "Error", message: message, in: self)
                    print("where am i", parsedJSON["message"] as Any)
                  }

              }

          } catch {
              Helper().showAlert(title: "JSON Error", message: error.localizedDescription, in: self)
            print("where am i 2")
          }

      }
  }.resume()

  let imageName = [UUID().uuidString, String(Date().timeIntervalSince1970)].joined()


}

private func save(_ message: Message) {


    self.messagesCollectionView.scrollToBottom()

}

Answer 1

确保您的视图控制器在 class 声明中声明符合 UIImagePickerControllerDelegate 和 UINavigationControllerDelegate：

class DirectMessageViewController: MessagesViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    [...]
}

或在一个或多个扩展中：

extension DirectMessageViewController: UIImagePickerControllerDelegate {
    [...]
}

extension DirectMessageViewController: UINavigationControllerDelegate {
    [...]
}

UIImagePickerController 未启动下一个功能

UIImagePickerController not initiating next function

uiimagepickercontroller

swift

messagekit

swift5