我无法访问UIViewController中的相机

Question

我真的希望我不是在做一个重复--但我读了一吨不同的相机-问题在这里，并执行他们的所有答案，结果是一样的：什么都没有发生！

没有错误，应用程序没有崩溃，没有任何问题--只是没有任何迹象的摄像头，它应该被激活！我的目标是在ViewDidIncure或viewDidLoad中激活它，但我也尝试过通过将代码连接到一个按钮来测试它--结果是一样的；什么都没有。在我自己的设备上和模拟器上都是：什么都没有！

我在这个简单的代码中犯了什么错误？？-或者我需要更改哪个设置？我试着玩过“数据保护”：什么都没有！

class CreateNewPerson: UIViewController, UITextFieldDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

func viewDidAppear () {
    let imagePicker = UIImagePickerController()

    imagePicker.delegate = self
    imagePicker.sourceType = .camera
    present(imagePicker, animated: true, completion: nil)
}

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

希望有人能帮助我！

谢谢！

Answer 1

您需要在info.plist文件中添加一个Camara使用说明，并请求允许您的应用程序访问相机。

将此添加到plist文件：

Privacy - Camera Usage Description

有一些文本，比如

AVCaptureDevice.requestAccess(for: AVMediaType.video) { granted in
    if granted {
        // show the image picker 
    } else {
        // show an error 
    }
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated) 

    checkCameraPermissions() 
}

private func checkCameraPermissions() {
    let status = AVCaptureDevice.authorizationStatus(for: .video)
    switch status {
       case .authorized: 
          self.presentPicker()
       case .notDetermined:
           self.requestPermissions()
       case .denied:
          // user denied access
          self.permissionDenied()   
    }
}

private func requestAccess() {
    AVCaptureDevice.requestAccess(for: AVMediaType.video) { granted in
        if !granted {
            // show an error 
        }
        // call it again in to recheck now that permissions have changed.
        checkCameraPermissions
    }
}

private func presentPicker() {
    // permissions are all set, continue as planned.
}

private func permissionDenied() {
    // show an alert and link to app settings to turn on

    // usually I would show a view which explains they have denied permission to the camera so this functionality isn't available until they manually change the setting in the app settings.
}