iOS 用户打开相机拒绝

让用户设置打开照相机，不打开不让进

- (void)checkOpenAuthorityOfTheCamera{
    
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    if(authStatus == AVAuthorizationStatusAuthorized){
//跳转目的页面，允许打开相机
    }
    else if (authStatus == AVAuthorizationStatusDenied){//跳到应用设置相机的地方
  UIAlertController * alertVC = [UIAlertController alertControllerWithTitle:@"提示" message:@"xxxxx需要访问你的照相机，请打开照相机权限" preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction * cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction * okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication]canOpenURL:url]) {
            [[UIApplication sharedApplication]openURL:url];
        }
    }];
    [alertVC addAction:cancelAction];
    [alertVC addAction:okAction];
    [self presentViewController:alertVC animated:YES completion:nil];
    
    }
    else if (authStatus == AVAuthorizationStatusNotDetermined){
//跳转目的页面，用户未选择
    }
    
}