如何在Flutter中获取AppBar的高度? [英] How to get AppBar height in Flutter?

问题描述

如何在Flutter中获取 AppBar 的高度?
我正在使用MarialApp窗口小部件('package:flutter/material.dart').

我拥有Context的高度，并想扣除应用栏的高度.

How can I get the height of an AppBar in Flutter?
I am using the MarialApp Widget ('package:flutter/material.dart').

I have the height of my Context and would like to deduct the height of the appbar.

final double height = MediaQuery.of(context).size.height;

推荐答案

我认为，这不是理想的方法，但是它可以工作.

This is not an ideal way, I think, but it will work.

首先声明要在Scaffold中使用的AppBar小部件.

Firstly declare the AppBar widget that you will use in your Scaffold.

Widget demoPage() {
  AppBar appBar = AppBar(
    title: Text('Demo'),
  );
  return Scaffold(
    appBar: appBar,
    body: /*
    page body
    */,
  );
}

现在，您可以使用appBar的> 高度:

double height = appBar.preferredSize.height;

您可以使用此高度来降低屏幕高度.

You can use this height to reduce from the screen height.

final double height = MediaQuery.of(context).size.height;

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