How to know that application have camera access or

问题:

My application uses the camera. In iOS8 they include a new privacy setting, Camera, where the user can manage use of camera rights for each application.

Problem:
If the user didn't allow my application to use camera then how can i know that My application have no access for camera.
like i can use ALAssetsLibrary authorizationStatus to discover the status of the photolibrary or ABAddressBookGetAuthorizationStatus to know status of phonebook access.

Question:
How i can know whether my application has camera access or not in iOS8, so that I may prompt the user to allow camera access for my application?

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I have below print screen of Photo booth which having same problem as my application have.

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When there is no camera access it will only show black screen no message nothing.

回答1:

Check AVAuthorizationStatus for camera availability and then handle cases accordingly

AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if(status == AVAuthorizationStatusAuthorized) {
  // authorized
} else if(status == AVAuthorizationStatusDenied){
  // denied
} else if(status == AVAuthorizationStatusRestricted){
  // restricted
} else if(status == AVAuthorizationStatusNotDetermined){
  // not determined
  [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {
    if(granted){
  NSLog(@"Granted access");
} else {
  NSLog(@"Not granted access");
}
  }];
}