在 swift 4 中访问相机和照片库

我正在尝试使用以下代码访问 swift4 中的相机和照片库

let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

但它不起作用。即使我确保 plist 具有相机和照片库授权，我也没有收到访问授权请求。我对代码进行了一些修改，如下所示

AVCaptureDevice.requestAccess(for: AVMediaType.video) { response in
    }
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
        })
    }

    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

现在我收到了相机和照片库的授权请求，我可以看到 AlertView，但是当我按下相机或相册时，如图所示，什么也没有发生。

我尝试了相机的设备和模拟器。

以下是在 iOS 中从照片和相机加载图像的代码。

ο 你需要创建你的UIImageView的一个outlet

⁠ 然后在图像视图上添加点击手势

‐ 然后将点击手势与 didTapOnImageView 函数连接。

⁠ 然后将以下扩展添加到您的视图控制器中。

//MARK:- Image Picker
extension YourViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    //This is the tap gesture added on my UIImageView.
    @IBAction func didTapOnImageView(sender: UITapGestureRecognizer) {
        //call Alert function
        self.showAlert()
    }

    //Show alert to selected the media source type.
    private func showAlert() {

        let alert = UIAlertController(title: "Image Selection", message: "From where you want to pick this image?", preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
            self.getImage(fromSourceType: .camera)
        }))
        alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
            self.getImage(fromSourceType: .photoLibrary)
        }))
        alert.addAction(UIAlertAction(title: "Cancel", style: .destructive, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }

    //get image from source type
    private func getImage(fromSourceType sourceType: UIImagePickerController.SourceType) {

        //Check is source type available
        if UIImagePickerController.isSourceTypeAvailable(sourceType) {

            let imagePickerController = UIImagePickerController()
            imagePickerController.delegate = self
            imagePickerController.sourceType = sourceType
            self.present(imagePickerController, animated: true, completion: nil)
        }
    }

    //MARK:- UIImagePickerViewDelegate.
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        self.dismiss(animated: true) { [weak self] in

            guard let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else { return }
            //Setting image to your image view
            self?.profileImgView.image = image
        }
    }

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

}

注意：不要忘记在 info.plist 中添加隐私设置

隐私 - 相机使用说明

隐私 - 照片库使用说明