Flutter 如何在颤振中使用堆栈、行和类似元素独立定位元素

Flutter 如何在颤振中使用堆栈、行和类似元素独立定位元素,flutter,widget,css-position,positioning,Flutter,Widget,Css Position,Positioning,我一直在尝试使用Stack、Posited、Row和类似的相关小部件在Flatter中复制这两个设计,但是,我一次又一次地陷入相同的阶段。我要么无法将文本居中,要么无法正确定位“后退”按钮。此外,我尽量不使用固定大小/位置,因为这在一定程度上可以适应不同的屏幕大小。 有人能告诉我正确的方向,如何创建这个或类似的布局,这些布局将在其他屏幕中重用吗 例1: 例2: 对于您的第1个示例,我提供了以下解决方案: class DetailScreen extends StatefulWidget {

我一直在尝试使用Stack、Posited、Row和类似的相关小部件在Flatter中复制这两个设计,但是,我一次又一次地陷入相同的阶段。我要么无法将文本居中,要么无法正确定位“后退”按钮。此外,我尽量不使用固定大小/位置,因为这在一定程度上可以适应不同的屏幕大小。 有人能告诉我正确的方向,如何创建这个或类似的布局,这些布局将在其他屏幕中重用吗

例1:

例2:


对于您的第1个示例,我提供了以下解决方案:

class DetailScreen extends StatefulWidget {
  @override
  _DetailScreenState createState() => _DetailScreenState();
}

class _DetailScreenState extends State<DetailScreen> {
  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.white,
      child: SafeArea(
        child: Stack(
          fit: StackFit.expand,
          children: [
            Container(
              margin: const EdgeInsets.all(5),
              decoration: BoxDecoration(
                color: Color(0xFF0B2746),
                borderRadius: BorderRadius.circular(15),
              ),
              child: Container(
                margin: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(10),
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    Padding(
                      padding: const EdgeInsets.symmetric(vertical: 18),
                      child: Text(
                        'Glossary',
                        style: TextStyle(
                          fontWeight: FontWeight.w800,
                          fontSize: 20,
                        ),
                      ),
                    )
                  ],
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Card(
                    margin: const EdgeInsets.only(left: 0),
                    child: Padding(
                      padding: const EdgeInsets.all(12),
                      child: Icon(Icons.arrow_back_ios),
                    ),
                    elevation: 6,
                  ),
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}
class DetailScreen扩展了StatefulWidget{
@凌驾
_DetailScreenState createState()=>\u DetailScreenState();
}
类_DetailScreenState扩展状态{
@凌驾
小部件构建(构建上下文){
退货(
颜色:颜色,白色,
儿童:安全区(
子:堆栈(
fit:StackFit.expand,
儿童:[
容器(
边距:常数边集所有(5),
装饰:盒子装饰(
颜色:颜色(0xFF0B2746),
边界半径:边界半径。圆形(15),
),
子:容器(
边距:常数边集全部(8),
装饰:盒子装饰(
颜色:颜色,白色,
边界半径:边界半径。圆形(10),
),
子:列(
crossAxisAlignment:crossAxisAlignment.center,
儿童:[
填充物(
填充:常量边集。对称(垂直:18),
子:文本(
“词汇表”,
样式:TextStyle(
fontWeight:fontWeight.w800,
尺寸:20,
),
),
)
],
),
),
),
填充物(
填充:仅限常量边集(顶部:20),
子:列(
crossAxisAlignment:crossAxisAlignment.start,
儿童:[
卡片(
边距:仅限常量边集(左:0),
孩子:填充(
填充:常量边集。全部(12),
子:图标(图标、箭头、背面),
),
标高:6,
),
],
),
)
],
),
),
);
}
}
结果如下:

对于第二个示例,我必须添加额外的逻辑:

class DetailScreen extends StatefulWidget {
  @override
  _DetailScreenState createState() => _DetailScreenState();
}

class _DetailScreenState extends State<DetailScreen> {
  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.white,
      child: SafeArea(
        child: Stack(
          fit: StackFit.expand,
          children: [
            Container(
              margin: const EdgeInsets.all(5),
              decoration: BoxDecoration(
                color: Color(0xFF0B2746),
                borderRadius: BorderRadius.circular(15),
              ),
              child: Column(
                children: [
                  Container(
                    height: 64.0,
                    width: double.infinity,
                    margin: const EdgeInsets.only(left: 54, right: 8, top: 8),
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.circular(10),
                    ),
                    child: Row(
                      children: <Widget>[
                        SizedBox(width: 20),
                        Icon(Icons.train, size: 35),
                        Expanded(
                          child: Padding(
                            padding: const EdgeInsets.symmetric(vertical: 18),
                            child: Text(
                              'Metro',
                              textAlign: TextAlign.center,
                              style: TextStyle(
                                fontWeight: FontWeight.w800,
                                fontSize: 20,
                              ),
                            ),
                          ),
                        ),
                        Icon(Icons.arrow_drop_down, size: 35),
                        SizedBox(width: 20),
                      ],
                    ),
                  ),
                  Expanded(
                    child: Container(
                        margin: const EdgeInsets.all(8),
                        decoration: BoxDecoration(
                          color: Colors.white,
                          borderRadius: BorderRadius.circular(10),
                        )),
                  )
                ],
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Card(
                    margin: const EdgeInsets.only(left: 0),
                    child: Padding(
                      padding: const EdgeInsets.all(12),
                      child: Icon(Icons.arrow_back_ios),
                    ),
                    elevation: 6,
                  ),
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}
class DetailScreen扩展了StatefulWidget{
@凌驾
_DetailScreenState createState()=>\u DetailScreenState();
}
类_DetailScreenState扩展状态{
@凌驾
小部件构建(构建上下文){
退货(
颜色:颜色,白色,
儿童:安全区(
子:堆栈(
fit:StackFit.expand,
儿童:[
容器(
边距:常数边集所有(5),
装饰:盒子装饰(
颜色:颜色(0xFF0B2746),
边界半径:边界半径。圆形(15),
),
子:列(
儿童:[
容器(
身高:64.0,
宽度:double.infinity,
边距:仅限常量边集(左:54,右:8,顶:8),
装饰:盒子装饰(
颜色:颜色,白色,
边界半径:边界半径。圆形(10),
),
孩子:排(
儿童:[
尺寸箱(宽度:20),
图标(Icons.train,尺寸:35),
扩大(
孩子:填充(
填充:常量边集。对称(垂直:18),
子:文本(
“地铁”,
textAlign:textAlign.center,
样式:TextStyle(
fontWeight:fontWeight.w800,
尺寸:20,
),
),
),
),
图标(图标。箭头下拉,尺寸:35),
尺寸箱(宽度:20),
],
),
),
扩大(
子:容器(
边距:常数边集全部(8),
装饰:盒子装饰(
颜色:颜色,白色,
边界半径:边界半径。圆形(10),
)),
)
],
),
),
填充物(
填充:仅限常量边集(顶部:20),
子:列(
crossAxisAlignment:crossAxisAlignment.start,
儿童:[
卡片(
边距:仅限常量边集(左:0),
孩子:填充(
填充:常量边集。全部(12),
子:图标(图标、箭头、背面),
),
标高:6,
),
],
),
)
],
),
),
);
}
}
结果如下:


对于您的第1个示例,我提供了以下解决方案:

class DetailScreen extends StatefulWidget {
  @override
  _DetailScreenState createState() => _DetailScreenState();
}

class _DetailScreenState extends State<DetailScreen> {
  @override
  Widget build(BuildContext context) {
    return Material(
      color: Colors.white,
      child: SafeArea(
        child: Stack(
          fit: StackFit.expand,
          children: [
            Container(
              margin: const EdgeInsets.all(5),
              decoration: BoxDecoration(
                color: Color(0xFF0B2746),
                borderRadius: BorderRadius.circular(15),
              ),
              child: Container(
                margin: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(10),
                ),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    Padding(
                      padding: const EdgeInsets.symmetric(vertical: 18),
                      child: Text(
                        'Glossary',
                        style: TextStyle(
                          fontWeight: FontWeight.w800,
                          fontSize: 20,
                        ),
                      ),
                    )
                  ],
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.only(top: 20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Card(
                    margin: const EdgeInsets.only(left: 0),
                    child: Padding(
                      padding: const EdgeInsets.all(12),
                      child: Icon(Icons.arrow_back_ios),
                    ),
                    elevation: 6,
                  ),
                ],
              ),
            )
          ],
        ),
      ),
    );
  }
}
class DetailScreen扩展了StatefulWidget{
@凌驾
_DetailScreenState createState()=>\u详细信息