颤振:屏幕打开时自动滚动到底部

问题描述：

我正在使用onpressed()向下滚动到列表视图的底部，但是我想无需按下该按钮来实现该目标，

I'm using onpressed() to scroll down to bottom of the List view, but i want to achieve that without Pressing the botton,

它必须在每次打开屏幕时自动滚动. 我试图将其放在initState()中它的不起作用，但是如果我按下按钮，它就会变

It must autoscroll for every screen opening. I tried to put it inside initState() its not working but if i press the button it wokrks

如何使其自动滚动?

工作代码:

 floatingActionButton: new FloatingActionButton(child: 
 Icon(Icons.arrow_downward),onPressed:_hola,)



_hola(){
  print("inti state started successfully");
controller1.animateTo(
controller1.position.maxScrollExtent,
  duration: const Duration(milliseconds: 10),
   curve: Curves.easeOut,);
}

非工作代码: //此代码可以成功打印，但不能真正调用该函数

Non Working Code: //This code prints successfully,but not really calling the function

class HomeState extends State<MyNewMessages> {
  @override
  void initState() 
{
 super.initState();
  print("hola is scrolling");
  _hola;
}
);
}

按下浮动按钮之前 按下浮动按钮后

答

在构建ListView或添加项目时(不确定您的操作方式)，请使用SchedulerBinding.instance.addPostFrameCallback更改下一帧的滚动位置.

When building your ListView or adding an item (not sure how you're doing it), use SchedulerBinding.instance.addPostFrameCallback to change the scroll position on the next frame.

SchedulerBinding.instance.addPostFrameCallback((_) {
  controller1.animateTo(
    controller1.position.maxScrollExtent,
    duration: const Duration(milliseconds: 10),
    curve: Curves.easeOut,);
  });
}

颤振:屏幕打开时自动滚动到底部

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