swift - AVCaptureDevice.requestAccessForMediaType 从不弹出窗口，始终返回 false

Question

我在询问用户有关相机的权限时遇到了一些问题。 authorizationStatus 始终为 NotDetermined。当我尝试向用户请求许可时，AVCaptureDevice.requestAccessForMediaType 永远不会弹出对话框，并且 granted 总是返回 false。我也无法在设置-隐私-相机中找到我的应用程序。

有人可以帮我吗？非常感谢

let availableCameraDevices = AVCaptureDevice.devicesWithMediaType(AVMediaTypeVideo)
    for device in availableCameraDevices{

        if (device.position == .Back){
            backCameraDevice = device
        }else{
            if (device.position == .Front){
                frontCameraDevice = device
            }
        }
    }

    let authorizationStatus = AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo)
    switch authorizationStatus {
    case .NotDetermined:
        // permission dialog not yet presented, request authorization
        AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo,
            completionHandler: { (granted:Bool) -> Void in
                if (granted == false) {
                    print(granted)
                }
                else {
                    print(granted)
                }
        })
    case .Authorized: break
        // go ahead
    case .Denied, .Restricted: break
        // the user explicitly denied camera usage or is not allowed to access the camera devices
    }

Answer 1

问题解决了。似乎当我们从 iOS 8 升级到 iOS 9 时，它在 info.plist 中有一个新属性，即 Bundle Display Name。 name 为 null 则设置为你的产品名称，否则系统将永远不知道哪个应用程序正在请求权限