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ユーザーがiOSで既にカメラアクセスを拒否した後に、カメラアクセスを要求する方法はありますか？

私はこのコードを使用していますが、残念ながら機能しません。

ユーザーがカメラへのアクセスを拒否した後、次にカメラを読み込もうとするときにカメラを再び使用する許可を求めます（この場合、カメラビューを使用するバーコードスキャナーです）。私は常にAVAuthorizationStatusDeniedを取得し、その後コードで再度要求しても、grantedは常に自動的にNOを返します。

私のユーザーの多くは、「バーコードスキャンをしようとすると画面が真っ黒になります」と電子メールを送っています。これは、何らかの理由でカメラへのアクセスを拒否しているためです。拒否は間違いだった可能性が高いため、再度プロンプトを表示できるようにします。

これを行う方法はありますか？

    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if(authStatus == AVAuthorizationStatusAuthorized)
    {
        NSLog(@"%@", @"You have camera access");
    }
    else if(authStatus == AVAuthorizationStatusDenied)
    {
        NSLog(@"%@", @"Denied camera access");

        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
            if(granted){
                NSLog(@"Granted access to %@", AVMediaTypeVideo);
            } else {
                NSLog(@"Not granted access to %@", AVMediaTypeVideo);
            }
        }];
    }
    else if(authStatus == AVAuthorizationStatusRestricted)
    {
        NSLog(@"%@", @"Restricted, normally won't happen");
    }
    else if(authStatus == AVAuthorizationStatusNotDetermined)
    {
        NSLog(@"%@", @"Camera access not determined. Ask for permission.");

        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
            if(granted){
                NSLog(@"Granted access to %@", AVMediaTypeVideo);
            } else {
                NSLog(@"Not granted access to %@", AVMediaTypeVideo);
            }
        }];
    }
    else
    {
        NSLog(@"%@", @"Camera access unknown error.");
    }
iosobjective-ciphonecamera
56
Ethan Allen

いくつかの調査の後、あなたは私が望むことをすることができないように見えます。 iOS 8以降の場合、ダイアログをポップし、設定アプリを自動的に開くためにコーディングした代替手段を次に示します。

いくつかのメモ：

  • IOS 10以降、Info.plistでNSCameraUsageDescriptionキーを指定してカメラアクセスを要求する必要があります。そうしないと、実行時にアプリがクラッシュします。
  • ユーザーがアプリの権限を変更すると、アプリが強制終了されます。ユーザーがその「実行」ボタンを押す前に、それに応じて処理し、必要なデータを保存します。
  • IOS 8と11の間のある時点で、Appleは、カメラの設定にアクセスして変更するために、ユーザーが設定アプリのプライバシーセルをタッチする必要がなくなりました。使用しているiOSのバージョンに基づいて、ユーザーが設定アプリで何を行うべきかについての指示。以下のコメントを残して、変更された正確なiOSのバージョンをすべて教えてくれたら、それは素晴らしいことです。

Swift 4：

View Controllerの上部で：

import AVFoundation

カメラビューを開く前に：

@IBAction func goToCamera()
{
    let status = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    switch (status)
    {
    case .authorized:
        self.popCamera()

    case .notDetermined:
        AVCaptureDevice.requestAccess(for: AVMediaType.video) { (granted) in
            if (granted)
            {
                self.popCamera()
            }
            else
            {
                self.camDenied()
            }
        }

    case .denied:
        self.camDenied()

    case .restricted:
        let alert = UIAlertController(title: "Restricted",
                                      message: "You've been restricted from using the camera on this device. Without camera access this feature won't work. Please contact the device owner so they can give you access.",
                                      preferredStyle: .alert)

        let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
        alert.addAction(okAction)
        self.present(alert, animated: true, completion: nil)
    }
}

完了ブロック付きの拒否アラート：

func camDenied()
{
    DispatchQueue.main.async
        {
            var alertText = "It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Close this app.\n\n2. Open the Settings app.\n\n3. Scroll to the bottom and select this app in the list.\n\n4. Turn the Camera on.\n\n5. Open this app and try again."

            var alertButton = "OK"
            var goAction = UIAlertAction(title: alertButton, style: .default, handler: nil)

            if UIApplication.shared.canOpenURL(URL(string: UIApplicationOpenSettingsURLString)!)
            {
                alertText = "It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Touch the Go button below to open the Settings app.\n\n2. Turn the Camera on.\n\n3. Open this app and try again."

                alertButton = "Go"

                goAction = UIAlertAction(title: alertButton, style: .default, handler: {(alert: UIAlertAction!) -> Void in
                    UIApplication.shared.open(URL(string: UIApplicationOpenSettingsURLString)!, options: [:], completionHandler: nil)
                })
            }

            let alert = UIAlertController(title: "Error", message: alertText, preferredStyle: .alert)
            alert.addAction(goAction)
            self.present(alert, animated: true, completion: nil)
    }
}

目的C：

View Controllerの上部で：

#import <AVFoundation/AVFoundation.h>

カメラビューを開く前に：

- (IBAction)goToCamera
{
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if(authStatus == AVAuthorizationStatusAuthorized)
    {
        [self popCamera];
    }
    else if(authStatus == AVAuthorizationStatusNotDetermined)
    {
        NSLog(@"%@", @"Camera access not determined. Ask for permission.");

        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted)
        {
            if(granted)
            {
                NSLog(@"Granted access to %@", AVMediaTypeVideo);
                [self popCamera];
            }
            else
            {
                NSLog(@"Not granted access to %@", AVMediaTypeVideo);
                [self camDenied];
            }
        }];
    }
    else if (authStatus == AVAuthorizationStatusRestricted)
    {
        // My own Helper class is used here to pop a dialog in one simple line.
        [Helper popAlertMessageWithTitle:@"Error" alertText:@"You've been restricted from using the camera on this device. Without camera access this feature won't work. Please contact the device owner so they can give you access."];
    }
    else
    {
        [self camDenied];
    }
}

拒否アラート：

- (void)camDenied
{
    NSLog(@"%@", @"Denied camera access");

    NSString *alertText;
    NSString *alertButton;

    BOOL canOpenSettings = (&UIApplicationOpenSettingsURLString != NULL);
    if (canOpenSettings)
    {
        alertText = @"It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Touch the Go button below to open the Settings app.\n\n2. Turn the Camera on.\n\n3. Open this app and try again.";

        alertButton = @"Go";
    }
    else
    {
        alertText = @"It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Close this app.\n\n2. Open the Settings app.\n\n3. Scroll to the bottom and select this app in the list.\n\n4. Turn the Camera on.\n\n5. Open this app and try again.";

        alertButton = @"OK";
    }

    UIAlertView *alert = [[UIAlertView alloc]
                          initWithTitle:@"Error"
                          message:alertText
                          delegate:self
                          cancelButtonTitle:alertButton
                          otherButtonTitles:nil];
    alert.tag = 3491832;
    [alert show];
}

UIAlertViewの呼び出しを委任します。

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (alertView.tag == 3491832)
    {
        BOOL canOpenSettings = (&UIApplicationOpenSettingsURLString != NULL);
        if (canOpenSettings)
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }
}
86
Ethan Allen

カメラへのアクセスを拒否すると、ユーザーは[設定]でアプリのカメラの使用を承認できます。設計上、独自のコードでこれをオーバーライドすることはできません。

次のサンプルコードでこのケースを検出し、ユーザーに修正方法を説明できます。 iOS 7 UIImagePickerController Camera No Image

NSString *mediaType = AVMediaTypeVideo; // Or AVMediaTypeAudio

AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];

// The user has explicitly denied permission for media capture.
else if(authStatus == AVAuthorizationStatusDenied){
    NSLog(@"Denied");
}
9
StilesCrisis

Swift 3.0

これにより、ユーザーは許可を変更するための設定に進みます。

func checkCameraAuthorise() -> Bool {
    let status = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
    if status == .restricted || status == .denied {
        let dialog = ZAlertView(title: "", message: "Please allow access to the camera in the device's Settings -> Privacy -> Camera", isOkButtonLeft: false, okButtonText: "OK", cancelButtonText: "Cancel", okButtonHandler:
            { _ -> Void in UIApplication.shared.openURL(URL(string: UIApplicationOpenSettingsURLString)!)}, cancelButtonHandler: { alertView in alertView.dismissAlertView() })
        dialog.show()
        return false
    }
    return true
}
2
ak_ninan

カメラアクセスとフォトライブラリアクセスの完全なコード

import AVFoundation

カメラアクションを処理するには、以下のコードを使用します。メソッド呼び出し

func openCameraOrLibrary(){
    let imagePicker = UIImagePickerController()
    let alertController : UIAlertController = UIAlertController(title: "Select Camera or Photo Library".localized, message: "", preferredStyle: .actionSheet)
    let cameraAction : UIAlertAction = UIAlertAction(title: "Camera".localized, style: .default, handler: {(cameraAction) in

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.camera) == true {
            if self.isCamAccessDenied() == false { **//Calling cam access method here**
                imagePicker.sourceType = .camera
                imagePicker.delegate = self
                self.present(imagePicker, animated: true, completion: nil)
            }

        }else{
            self.present(self.showAlert(Title: "", Message: "Camera is not available on this Device or accesibility has been revoked!".localized), animated: true, completion: nil)
            self.showTabbar()

        }

    })

    let libraryAction : UIAlertAction = UIAlertAction(title: "Photo Library", style: .default, handler: {(libraryAction) in

        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary) == true {

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

        }else{
            self.showTabbar()
            self.present(self.showAlert(Title: "", Message: "Photo Library is not available on this Device or accesibility has been revoked!".localized), animated: true, completion: nil)
        }
    })

    let cancelAction : UIAlertAction = UIAlertAction(title: "Cancel".localized, style: .cancel , handler: {(cancelActn) in
        self.showTabbar()
    })

    alertController.addAction(cameraAction)

    alertController.addAction(libraryAction)

    alertController.addAction(cancelAction)

    alertController.popoverPresentationController?.sourceView = view
    alertController.popoverPresentationController?.sourceRect = view.frame

    self.present(alertController, animated: true, completion: nil)
    self.hideTabbar()

}

カメラアクセス機能を処理する方法

func isCamAccessDenied()-> Bool
{
    let status = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    if status == .restricted || status == .denied {
    DispatchQueue.main.async
        {
            var alertText = "It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Close this app.\n\n2. Open the Settings app.\n\n3. Scroll to the bottom and select this app in the list.\n\n4. Turn the Camera on.\n\n5. Open this app and try again."

            var alertButton = "OK"
            var goAction = UIAlertAction(title: alertButton, style: .default, handler: nil)

            if UIApplication.shared.canOpenURL(URL(string: UIApplicationOpenSettingsURLString)!)
            {
                alertText = "It looks like your privacy settings are preventing us from accessing your camera to do barcode scanning. You can fix this by doing the following:\n\n1. Touch the Go button below to open the Settings app.\n\n2. Turn the Camera on.\n\n3. Open this app and try again."

                alertButton = "OK"

                goAction = UIAlertAction(title: alertButton, style: .default, handler: {(alert: UIAlertAction!) -> Void in
                    UIApplication.shared.open(URL(string: UIApplicationOpenSettingsURLString)!, options: [:], completionHandler: nil)
                })
            }

            let alert = UIAlertController(title: "Error", message: alertText, preferredStyle: .alert)
            alert.addAction(goAction)
            self.present(alert, animated: true, completion: nil)
        }
        return true
    }
    return false
}
0
Alok