Flutter - Create a countdown widget

Question

I am trying to build a countdown widget. Currently, I got the structure to work. I only struggle with the countdown itself. I tried this approach using the countdown plugin:

Answer 1

Why not use a simple TweenAnimationBuilder its easy to use and you don't need to manage any stream controllers or worry about using streams and disposing them off etc;

TweenAnimationBuilder(
                duration: Duration(seconds: 10),
                tween: Tween(begin: 100.0, end: 0.0),
                onEnd: () {
                  print('Countdown ended');
                },
                builder: (BuildContext context, double value, Widget child) {
                  return Padding(
                      padding: const EdgeInsets.symmetric(vertical: 5),
                      child: Text('${value.toInt()}',
                          textAlign: TextAlign.center,
                          style: TextStyle(
                              color: Colors.black,
                              fontWeight: FontWeight.bold,
                              fontSize: 40)));
                }),

here's the dartpad example to playaround output:

originally answered here