如何让按钮之间的间距占用颤音/飞镖中的所有可用屏幕空间？

Question

现在我的屏幕看起来像这样：

​

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'),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

​由于：

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

但是我希望它是相对的。换句话说，这些按钮的两组之间的距离应为最大值，即占据它们之间的所有自由空间。

怎么做？

edi11 。现在，使用Prabhakaran的代码看起来像这样。这很酷。但是如何使这个距离尽可能大呢？

Answer 1

而不是大小的盒子使用spacer（）

还将绑定到专利容器（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
   ]
)
)

Answer 2

带有堆栈的按钮小部件是不必要的。您可以用另一列包裹按钮，并使用类似的父属性的mainaxisalignment。我为您创建了一个按钮小部件。因此，您的代码看起来很干净，最小化。

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

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisSize: MainAxisSize.max,
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: <Widget>[
          Column(
            children: [
              GradientButton(label: 'New Game', onTap: () {print('New Game');}),
              GradientButton(label: 'Continue Game', onTap: () {print('Continue Game');}),
            ],
          ),
          Column(
            children: [
              GradientButton(label: 'Button 1', onTap: () {print('Button 1');}),
              GradientButton(label: 'Button 2', onTap: () {print('Button 2');}),
            ],
          )
        ],
      ),
    );
  }
}

class GradientButton extends StatelessWidget {
  const GradientButton({Key? key, required this.label, required this.onTap}) : super(key: key);
  final String label;
  final Function onTap;

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: const EdgeInsets.symmetric(vertical: 15),
      child: GestureDetector(
        onTap: () => onTap(),
        child: Container(
          padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
          decoration: const BoxDecoration(
            borderRadius: BorderRadius.all(Radius.circular(4)),
            gradient: LinearGradient(
              colors: <Color>[
                Color(0xFF0D47A1),
                Color(0xFF1976D2),
                Color(0xFF42A5F5),
              ],
            ),
          ),
          child: Text(label, style: const TextStyle(fontSize: 20, color: Colors.white, fontWeight: FontWeight.normal, decoration: TextDecoration.none),),
        ),
      ),
    );
  }
}

Answer 3

替换

const SizeBox(height: 300), 

并

const Spacer(),

删除

mainAxisSize: MainAxisSize.min,