如何让按钮之间的间距占据 Flutter/Dart 中所有可用的屏幕空间？答案

【问题标题】：How to let spacing between buttons take up all available screen space in Flutter/Dart?如何让按钮之间的间距占据 Flutter/Dart 中所有可用的屏幕空间？
【发布时间】：2022-07-06 21:14:01
【问题描述】：

现在我的屏幕是这样的：

这是我的代码的一部分：

class MyStatelessWidget extends StatelessWidget {
  const MyStatelessWidget({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
          const SizedBox(height: 30),
          ClipRRect(
            borderRadius: BorderRadius.circular(4),
            child: Stack(
              children: <Widget>[
                Positioned.fill(
                  child: Container(
                    decoration: const BoxDecoration(
                      gradient: LinearGradient(
                        colors: <Color>[
                          Color(0xFF0D47A1),
                          Color(0xFF1976D2),
                          Color(0xFF42A5F5),
                        ],
                      ),
                    ),
                  ),
                ),
                TextButton(
                  style: TextButton.styleFrom(
                    padding: const EdgeInsets.all(16.0),
                    primary: Colors.white,
                    textStyle: const TextStyle(fontSize: 20),
                  ),
                  onPressed: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => const NewGameRoute()),
                    );
                  },
                  child: const Text('New Game'),
                ),
              ],
            ),
          ),
          const SizedBox(height: 30),
          ClipRRect(
            borderRadius: BorderRadius.circular(4),
            child: Stack(
              children: <Widget>[
                Positioned.fill(
                  child: Container(
                    decoration: const BoxDecoration(
                      gradient: LinearGradient(
                        colors: <Color>[
                          Color(0xFF0D47A1),
                          Color(0xFF1976D2),
                          Color(0xFF42A5F5),
                        ],
                      ),
                    ),
                  ),
                ),
                TextButton(
                  style: TextButton.styleFrom(
                    padding: const EdgeInsets.all(16.0),
                    primary: Colors.white,
                    textStyle: const TextStyle(fontSize: 20),
                  ),
                  onPressed: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => const NewGameRoute()),
                    );
                  },
                  child: const Text('Continue Game'),
                ),
              ],
            ),
          ),
          const SizedBox(height: 300), //300 as example
          ClipRRect(
            borderRadius: BorderRadius.circular(4),
            child: Stack(
              children: <Widget>[
                Positioned.fill(
                  child: Container(
                    decoration: const BoxDecoration(
                      gradient: LinearGradient(
                        colors: <Color>[
                          Color(0xFF0D47A1),
                          Color(0xFF1976D2),
                          Color(0xFF42A5F5),
                        ],
                      ),
                    ),
                  ),
                ),
                TextButton(
                  style: TextButton.styleFrom(
                    padding: const EdgeInsets.all(16.0),
                    primary: Colors.white,
                    textStyle: const TextStyle(fontSize: 20),
                  ),
                  onPressed: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => const NewGameRoute()),
                    );
                  },
                  child: const Text('Button 3'),
                ),
              ],
            ),
          ),
          const SizedBox(height: 30),
          ClipRRect(
            borderRadius: BorderRadius.circular(4),
            child: Stack(
              children: <Widget>[
                Positioned.fill(
                  child: Container(
                    decoration: const BoxDecoration(
                      gradient: LinearGradient(
                        colors: <Color>[
                          Color(0xFF0D47A1),
                          Color(0xFF1976D2),
                          Color(0xFF42A5F5),
                        ],
                      ),
                    ),
                  ),
                ),
                TextButton(
                  style: TextButton.styleFrom(
                    padding: const EdgeInsets.all(16.0),
                    primary: Colors.white,
                    textStyle: const TextStyle(fontSize: 20),
                  ),
                  onPressed: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => const NewGameRoute()),
                    );
                  },
                  child: const Text('Button 4'),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

按钮之间的大距离是由于：

const SizeBox(height: 300), //300 as example

但我希望它是相对的。也就是说，这两组按钮之间的距离应该是最大的，即占据了它们之间的所有空闲空间。

怎么做？

【问题讨论】：

标签： flutter dart flutter-layout

【解决方案1】：

使用Spacer()代替sizedBox

还设置一个绑定到专利容器，如

Container(
height: MediaQuery.of(context).size.height,
width : MediaQuery.of(context).size.width,
Column(
  children : [
     //First set of buttons here
     Spacer(),
    //Second set of buttons here
   ]
)
)

【讨论】：

【解决方案2】：

替换

const SizeBox(height: 300),

与

const Spacer(),

并删除

mainAxisSize: MainAxisSize.min,

【讨论】：