NSString *mediaType = AVMediaTypeVideo; // Or AVMediaTypeAudio
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
// This status is normally not visible—the AVCaptureDevice class methods for discovering devices do not return devices the user is restricted from accessing.
if(authStatus == AVAuthorizationStatusRestricted){
NSLog(@"Restricted");
}
// The user has explicitly denied permission for media capture.
else if(authStatus == AVAuthorizationStatusDenied){
NSLog(@"Denied");
}
// The user has explicitly granted permission for media capture, or explicit user permission is not necessary for the media type in question.
else if(authStatus == AVAuthorizationStatusAuthorized){
NSLog(@"Authorized");
}
// Explicit user permission is required for media capture, but the user has not yet granted or denied such permission.
else if(authStatus == AVAuthorizationStatusNotDetermined){
[AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
// Make sure we execute our code on the main thread so we can update the UI immediately.
//
// See documentation for ABAddressBookRequestAccessWithCompletion where it says
// "The completion handler is called on an arbitrary queue."
//
// Though there is no similar mention for requestAccessForMediaType, it appears it does
// the same thing.
//
dispatch_async(dispatch_get_main_queue(), ^{
if(granted){
// UI updates as needed
NSLog(@"Granted access to %@", mediaType);
}
else {
// UI updates as needed
NSLog(@"Not granted access to %@", mediaType);
}
});
}];
}
else {
NSLog(@"Unknown authorization status");
}