卡片宽度与父级匹配：flutter

Question

我是 Flutter 新手，所以我想知道如何设置宽度以匹配父布局宽度

new Scaffold(
    body: new Container(
  decoration: new BoxDecoration(color: AppColors.hoBlue),
  child: Padding(
    padding: EdgeInsets.all(20.0),
    child: new Center(
        child: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Stack(
          children: <Widget>[
            Row(
              children: <Widget>[
                Expanded(
                  child: Padding(
                    padding: EdgeInsets.all(20.0),
                    child: Card(
                      child: Padding(
                          padding: EdgeInsets.fromLTRB(20, 0.0, 20.0,20.0),
                          child: Column(
                            children: <Widget>[
                               Card(
                                    elevation: 10.0,
                                    child: Padding(
                                      padding: EdgeInsets.all(20.0),
                                      child:
                                      Text("Sign Up Here"),
                                    ),
                                  ),
                              TextField(
                                decoration: InputDecoration(
                                  labelText: "Email",
                                  hintText: "example@mail.com",
                                ),
                                autofocus: true,
                              ),
                              TextField(
                                decoration: InputDecoration(
                                  labelText: "Password",
                                ),
                                autofocus: true,
                              ),
                              SizedBox(
                                width: double.infinity,
                                // height: double.infinity,
                                child: new RaisedButton(
                                  color: AppColors.hoBlue,
                                  child: Text(
                                    "Sign In",
                                    style: TextStyle(
                                      color: Colors.white,
                                      fontFamily: 'Raleway',
                                      fontSize: 22.0,
                                    ),
                                  ),
                                  onPressed: () => print('Sign In'),
                                ),
                              )
                            ],
                          )),
                    ),
                  ),
                ),
              ],
            )
          ],
        ),
      ],
    )),
  ),
));

上面代码的结果

我需要帮助与父母一起制作卡片叠像 我想要的结果

我已经尝试使用堆栈，但结果卡父卡与第一张卡重叠。

我对 Expanded 标签有一点了解，但是将视图扩展到两个方向，我不知道该怎么做。知道的帮忙看看，先谢谢了。

Answer 1

您不需要Stack获得该视图 - 可以使用Column &Material小部件来完成。

return Scaffold(
        body: new Container(
      decoration: new BoxDecoration(color: Colors.blue),
      child: new Center(
          child: MergeSemantics(
            child: Padding(
              padding: const EdgeInsets.all(16.0),
              child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: <Widget>[
              Card(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: <Widget>[
                    Material(
                      elevation: 24.0,
                      child: Padding(
                        padding: const EdgeInsets.all(20.0),
                        child: Text("Sign Up Here"),
                      ),
                    ),
                    Padding(
                        padding: EdgeInsets.fromLTRB(20, 10.0, 20.0, 20.0),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.stretch,
                          children: <Widget>[
                            TextField(
                              decoration: InputDecoration(
                                labelText: "Email",
                                hintText: "example@mail.com",
                              ),
                              autofocus: true,
                            ),
                            TextField(
                              decoration: InputDecoration(
                                labelText: "Password",
                              ),
                              autofocus: true,
                            ),
                            SizedBox(
                              width: double.infinity,
                              // height: double.infinity,
                              child: new RaisedButton(
                                color: Colors.blue,
                                child: Text(
                                  "Sign In",
                                  style: TextStyle(
                                    color: Colors.white,
                                    fontFamily: 'Raleway',
                                    fontSize: 22.0,
                                  ),
                                ),
                                onPressed: () => print('Sign In'),
                              ),
                            )
                          ],
                        )),
                  ],
                ),
              ),
        ],
      ),
            ),
          )),
    ));

输出：

Answer 2

只需将卡放入容器中即可

Padding(
            padding: EdgeInsets.all(20),
            child: Container(
              height: 50,
              width: double.infinity,
              child: Card(
                child: Align(
                    alignment: Alignment.centerLeft,
                    child: Text("Edit Profile")),
              ),
            ),
          )

Answer 3

如果您想调整卡片视图的大小或更改卡片视图，那么只需将卡片放入容器视图中，然后调整您的容器大小。此链接将帮助您：https : //stackoverflow.com/a/50017126/7418129