如何检测用户已单击“不允许访问摄像头” [英] How to detect user has clicked Don't Allow access to camera

问题描述

我正在使用 UIImagePicker 向用户展示相机以拍摄将在应用中使用的照片。

I am using a UIImagePicker to present the users with camera to take photos which will be used in the app.

我的问题是，当用户第一次打开图像选择器时，会向他们显示一条提示：'我的应用程序想要使用两个选项访问您的相机，不允许和确定。

My problem is that on the first time a user opens the image picker they are presented with a prompt saying: '"my App" Would like to Access your Camera' with two options, Don't allow and OK.

我的要求是，当用户点击不允许时，图像选择器将被解除，留下黑色视图。有没有办法检测用户选择了不允许？

My requirement is that when the user clicks Don't Allow, the Image picker gets dismissed leaving a black view. Is there a way to detect that the user has chosen Don't allow?

这是我的代码来呈现 UIImagePicker ：

var PhotoPicker:UIImagePickerController = UIImagePickerController()
PhotoPicker.delegate = self
PhotoPicker.sourceType = .Camera
PhotoPicker.cameraFlashMode = .Off
PhotoPicker.showsCameraControls = false
PhotoPicker.cameraDevice = .Rear
self.presentViewController(PhotoPicker, animated: false, completion: nil)

推荐答案

要检测对您图书馆的访问权限：

您需要使用AssetsLibrary。首先，导入资产库框架：

You need to use AssetsLibrary for that. First, import assets library framework:

import AssetsLibrary

然后，请求授权状态，如果未确定，请使用块来捕获这些事件，如下所示：

Then, request authorization status, and if it is not determined, use blocks to catch those events, like this:

if ALAssetsLibrary.authorizationStatus() == ALAuthorizationStatus.NotDetermined {

    let library = ALAssetsLibrary()
    library.enumerateGroupsWithTypes(.All, usingBlock: { (group, stop) -> Void in

        // User clicked ok
    }, failureBlock: { (error) -> Void in

        // User clicked don't allow
        imagePickerController.dismissViewControllerAnimated(true, completion: nil)
    })
}

要检测对相机的访问权限：

您需要使用AVFoundation。首先，导入avfoundation框架：

You need to use AVFoundation for that. First, import avfoundation framework:

import AVFoundation

然后，如前所述，当您转到imagepicker并捕获事件时请求用户权限。

Then, as previously, request user permission when you go to imagepicker and catch the event.

if AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeVideo) == AVAuthorizationStatus.NotDetermined {

    AVCaptureDevice.requestAccessForMediaType(AVMediaTypeVideo, completionHandler: { (videoGranted: Bool) -> Void in

        // User clicked ok
        if (videoGranted) {

        // User clicked don't allow
        } else {
            imagePickerController.dismissViewControllerAnimated(true, completion: nil)
        }
    })
}

希望有所帮助！

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