- (void)check {
      // 判斷是否是模擬器
        if ([[UIDevice deviceVersion] isEqualToString:@"iPhone Simulator"]) {
            [self showInfo:@"請用真機進行測試, 此模塊不支持模擬器測試"];
            return NO;
        }
        
        // 判斷是否有攝像頭
        if(![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){
            [self showInfo:@"您的設備沒有攝像頭或者相關的驅動, 不能進行直播"];
            return NO;
        }
        
        // 判斷是否有攝像頭權限
        AVAuthorizationStatus  authorizationStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
        if (authorizationStatus == AVAuthorizationStatusRestricted|| authorizationStatus == AVAuthorizationStatusDenied) {
            [self showInfo:@"app需要訪問您的攝像頭。\\n請啟用攝像頭-設置/隱私/攝像頭"];
            return NO;
        }
        
        // 開啟麥克風權限
        AVAudioSession *audioSession = [AVAudioSession sharedInstance];
        if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
            [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                if (granted) {
                    return YES;
                }
                else {
                    [self showInfo:@"app需要訪問您的麥克風。\\n請啟用麥克風-設置/隱私/麥克風"];
                    return NO;
                }
            }];
        }
}