if (camera == nil) {
        
        
        
        self.cameraView.touchViewDelegate=self;
        
        //视频预览页面增加手势识别，使摄像头能够上，下，左，右，变焦。
        
        UIPinchGestureRecognizer  *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAction:)];
        [self.cameraView addGestureRecognizer:pinch];
        
        //视频预览页面需要一个view来接收
        
        camera = [TGDCamera cameraWithView:self.cameraView];
        
        
        
        
    }
    

    //登录到摄像头，获取取视频流
    [camera loginWithIpAddress:@"192.168.1.245" userName:@"admin" password:@"skyinno1"];

    
    
}