swift - 谁能告诉我为什么当我按下摄像头按钮时我的应用程序崩溃了

Question

我有一个我选择删除的类，之后我的添加不断崩溃。

下面是按钮里面的内容

@IBAction func cameraButton_TouchUpInside(_ sender: Any) {
        let imagePickerController = ImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.imageLimit = 1
        present(imagePickerController, animated: true, completion: nil)
    }

func wrapperDidPress(_ imagePicker: ImagePickerController, images: [UIImage]) {

    }
    func doneButtonDidPress(_ imagePicker: ImagePickerController, images: [UIImage]) {
        guard let image = images.first else {
            dismiss(animated: true, completion: nil)
            return
        }


   if let image = info["UIImagePickerControllerOriginalImage"] as? UIImage{
            selectedImage = image
            photo.image = image
            dismiss(animated: true, completion: nil)
//            dismiss(animated: true, completion: {
//                self.performSegue(withIdentifier: "Camera", sender: nil)
//            })
        }

如果我取消注释上面的内容，当我尝试从库中选择时我的应用程序崩溃

更多

//    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
//        if segue.identifier == "filter_segue" {
//            let filterVC = segue.destination as! FilterViewController
//            filterVC.selectedImage = self.selectedImage
//            filterVC.delegate = self
//        }
   // }

//extension CameraViewController: FilterViewControllerDelegate {
//    func updatePhoto(image: UIImage) {
//        self.photo.image = image
//        self.selectedImage = image
//    }
//}

Answer 1

崩溃可能仅仅是因为这些:

• 没有向 info.plist 添加所需的权限(在这种情况下，您将在日志中收到消息，指出 .plist 文件中缺少权限。
• 对象没有连接到正确的 IBOutlet(在这种情况下，文件中 IBOutlet 旁边的圆圈将为空，这意味着它没有连接到任何对象。)

对于您的情况，您的 info.plist 中缺少许可。您应该添加 NSCameraUsageDescription 并且该值是一个字符串，当询问用户打开相机的权限时，该字符串将显示在权限对话框中。它将是这样的: