iOS 相机权限：相机在 iphone 和 ipad 上显示为黑色（UIImagePickerController 问题 iOS 9）

Question

在我的应用程序中，我使用以下代码访问相机以更改用户的个人资料图片。但我无法访问相机。

 if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
    {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.delegate = self;
        picker.allowsEditing = YES;
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
 if(isIOS8SystemVersion)
        {
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
                [self presentViewController:picker animated:YES completion:NULL];
            }];
        }
        else
        {
            [self presentViewController:picker animated:YES completion:NULL];
        }

此代码在 iOS 7.x 的 iPhone 4(16gb) 上运行良好。但在 iOS 9 中，呈现的 viewController 显示为黑屏，我无法拍照。同样是photoLibrary 的情况。相同的代码适用于我在同一设备上的其他应用程序。

我在 Stack Overflow 中遇到了很多问题并尝试了很多解决方案。但它们对我不起作用。比如为 UIImagePIcker 控制器等制作单例。

在settings->privacy->camera->我看不到我的应用列在这个部分。

为了让 iOS 应用程序可以访问相机和照片，需要做哪些事情？我错过了什么吗？

Answer 1

只需延迟您的功能以打开相机，它就会正常工作：D 使用以下代码：

[self performSelector:@selector(showCamera) withObject:nil afterDelay:1.0];


-(void)showCamera
{
if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    if(isIOS8SystemVersion)
    {
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self presentViewController:picker animated:YES completion:NULL];
        }];
    }
    else
    {
        [self presentViewController:picker animated:YES completion:NULL];
    }
}

Answer 2

首先调用该方法并判断摄像头的权限

-(void)PermissionForCamera
{
    NSString *mediaType = AVMediaTypeVideo;
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];

    if(authStatus == AVAuthorizationStatusAuthorized)
    {
        NSLog(@"AVAuthorizationStatusAuthorized");
        // run your code for camera
        ImagePicker = [[UIImagePickerController alloc] init];
        [ImagePicker setDelegate:self];
        ImagePicker = UIImagePickerControllerSourceTypeCamera;

        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self ImagePicker animated:YES completion:nil];
        }];
    }
    else if(authStatus == AVAuthorizationStatusNotDetermined)
    {
        NSLog(@"AVAuthorizationStatusNotDetermined");
        // run your code for camera
        ImagePicker = [[UIImagePickerController alloc] init];
        [ImagePicker setDelegate:self];
        ImagePicker = UIImagePickerControllerSourceTypeCamera;

        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self ImagePicker animated:YES completion:nil];
        }];
    }
    else
    {
        // turn on the camera permission from settings
    }


}