- (void)check {
      // 判断是否是模拟器
        if ([[UIDevice deviceVersion] isEqualToString:@"iPhone Simulator"]) {
            [self showInfo:@"请用真机进行测试, 此模块不支持模拟器测试"];
            return NO;
        }
        
        // 判断是否有摄像头
        if(![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
            [self showInfo:@"您的设备没有摄像头或者相关的驱动, 不能进行直播"];
            return NO;
        }
        
        // 判断是否有摄像头权限
        AVAuthorizationStatus  authorizationStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        if (authorizationStatus == AVAuthorizationStatusRestricted|| authorizationStatus == AVAuthorizationStatusDenied) {
            [self showInfo:@"app需要访问您的摄像头。\\n请启用摄像头-设置/隐私/摄像头"];
            return NO;
        }
        
        // 开启麦克风权限
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
            [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                if (granted) {
                    return YES;
                }
                else {
                    [self showInfo:@"app需要访问您的麦克风。\\n请启用麦克风-设置/隐私/麦克风"];
                    return NO;
                }
            }];
        }
}