如何快速实现相机

Question

当我按下相机按钮时，我的应用程序总是崩溃。当我按下相机按钮时，我试图让相机出现在我的屏幕上。

@IBAction func ACPressed(_ sender: Any) {
    let picker = UIImagePickerController()

    picker.delegate = self
    picker.sourceType = .camera

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

private func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String :AnyObject] ){        
    camera.image = info [UIImagePickerControllerOriginalImage] as? UIImage; dismiss(animated: true, completion: nil)
}

Answer 1

这可能是模拟器问题。如果您想添加代码来处理这种情况，您可以执行以下操作：

    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) {
        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.camera
        imagePicker.allowsEditing = false
        self.present(imagePicker, animated: true, completion: nil)
    }

通过将其包装在“isSourceTypeAvailable”中，它将避免崩溃。您可以在其中添加一条 else 语句并显示一条通知该问题的警报消息。

Answer 2

请勿使用模拟器测试相机。使用真实设备。 您将看到异常的另一种方式：

*** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“源类型 1 不可用”

class ViewController:UIViewController, UIImagePickerControllerDelegate {

    private var imagePicker    : UIImagePickerController!
    private var photo: UIImage?

    @IBAction func ACPressed(_ sender: Any) {
        imagePicker            = UIImagePickerController()
        imagePicker.delegate   = self
        imagePicker.sourceType = .camera
        present(imagePicker, animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        imagePicker.dismiss(animated: true, completion: nil)
        photo = info[UIImagePickerControllerOriginalImage] as? UIImage

    }
}

不要忘记在您的 Info.plist

我不知道为什么我的答案被否决了，但在真实设备上尝试此代码，您会发现代码完美运行！