Flutter scroll slowly to the bottom of a dynamic Listview - flutter

Question

I have a list view that its item may vary each time. I want to make auto scroll for it.
I tried this code
scrollController.animateTo(
scrollController.position.maxScrollExtent,
duration: Duration(seconds: 10),
curve: Curves.easeOut);
It works perfectly for small list view but when the list view items are 100 or more it start moving so fast.
I also tried to make the duration longer when the list view have more items but it mess up

Answer 1

The issue was caused from the animation itself not the duration.
I solved it by increasing the duration and setting
curve: Curves.linear.

Answer 2

// Declaring the controller and the item size
ScrollController _scrollController;
final itemSize = 100.0;
// Initializing
#override
void initState() {
_scrollController = ScrollController();
_scrollController.addListener(_scrollListener);
super.initState();
}
// Your list widget (must not be nested lists)
ListView.builder(
controller: _scrollController,
itemCount: <Your list length>,
itemExtent: itemSize,
itemBuilder: (context, index) {
return ListTile(<your items>);
},
),
// With the listener and the itemSize, you can calculate which item
// is on screen using the provided callBack. Something like this:
void _scrollListener() {
setState(() {
var index = (_scrollController.offset / itemSize).round() + 1;
});
}

Answer 3

import 'dart:async';
import 'package:flutter/material.dart';
class Home extends StatefulWidget {
#override
_HomeState createState() => _HomeState();
}
class _HomeState extends State<Home> {
final _controller = ScrollController();
#override
void dispose() {
_controller.dispose();
super.dispose();
}
#override
Widget build(BuildContext context) {
Timer(
Duration(seconds: 2),
() => _controller.animateTo(
_controller.position.maxScrollExtent,
duration: Duration(seconds: 2),
curve: Curves.fastOutSlowIn,
),
);
return Scaffold(
body: ListView.builder(itemBuilder:(context, index) {
return Text('hi');
},
controller: _controller,
)
);
}
}