表单操作的组件

开关

Switch(
  value: false,
  onChanged: (value) {},
),

复选框

Checkbox(
  value: false,
  activeColor: Colors.red,
  onChanged: (value) {},
)

输入框

TextEditingController _unameController = TextEditingController(); // 定义一个controller

TextField(
  autofocus: true,
  controller: _unameController, // 设置输入框controller
  decoration: InputDecoration(
      labelText: "用户名",
      hintText: "用户名或邮箱",
      prefixIcon: Icon(Icons.person)),
),
TextField(
  decoration: InputDecoration(
      labelText: "密码",
      hintText: "您的登录密码",
      prefixIcon: Icon(Icons.lock)),
  obscureText: true,
  onChanged: (value) { // 监听文本变化
    print(value);
  },
),

print(_unameController.text); // 获取输入框内容