/**
 * 大部分屬性同TextFiled
 *
 * TextFormField({
    Key key,
    this.controller,//控制正在編輯的文本。如果為空，這個(gè)小部件將創(chuàng)建自己的TextEditingController并使用initialValue初始化它的TextEditingController.text
    String initialValue,//初始值
    FocusNode focusNode,
    InputDecoration decoration = const InputDecoration(),//輸入器裝飾
    TextInputType keyboardType,//彈出鍵盤的類型
    TextCapitalization textCapitalization = TextCapitalization.none,//戶輸入中的字母大寫的選項(xiàng),TextCapitalization.sentences每個(gè)句子的首字母大寫,TextCapitalization.characters:句子中的所有字符都大寫，TextCapitalization.words : 將每個(gè)單詞的首字母大寫。
    TextInputAction textInputAction,//更改TextField的textInputAction可以更改鍵盤右下角的操作按鈕,搜索，完成
    TextStyle style,
    TextDirection textDirection,//文字顯示方向
    TextAlign textAlign = TextAlign.start,//文字顯示位置
    bool autofocus = false,//自動(dòng)獲取焦點(diǎn)
    bool obscureText = false,//是否隱藏輸入，true密碼樣式顯示，false明文顯示
    bool autocorrect = true,
    bool autovalidate = false,//是否自動(dòng)驗(yàn)證值
    bool maxLengthEnforced = true,
    int maxLines = 1,//編輯框最多顯示行數(shù)
    int maxLength,//輸入最大長度，并且默認(rèn)情況下會(huì)將計(jì)數(shù)器添加到TextField
    VoidCallback onEditingComplete,//當(dāng)用戶提交時(shí)調(diào)用
    ValueChanged<String> onFieldSubmitted,
    FormFieldSetter<String> onSaved,//當(dāng)Form表單調(diào)用保存方法save時(shí)回調(diào)
    FormFieldValidator<String> validator,//Form表單驗(yàn)證
    List<TextInputFormatter> inputFormatters,
    bool enabled = true,
    Brightness keyboardAppearance,
    EdgeInsets scrollPadding = const EdgeInsets.all(20.0),
    bool enableInteractiveSelection = true,
    })
 */

body: Container(
          padding: EdgeInsets.all(12.0),
          color: Color(0xfff1f1f1),
          child: Form(
            key: _globalKey,
            child: Column(
              children: <Widget>[
                TextFormField(
                  decoration: InputDecoration(
                      labelText: "請(qǐng)輸入用戶名",
                      labelStyle: TextStyle(
                          color: Colors.green,
                          fontSize: 20.0
                      )
                  ),
                  onSaved: (value) { //formState.save()方法執(zhí)行完之后執(zhí)行onSaved方法
                    print("!!!!!!!!!!!!!!!! onSaved");
                    name = value;
                  },
                  onFieldSubmitted: (value) {
                    print("!!!!!!!!!!!!!!!! onFieldSubmitted:$value");
                  },
                  onEditingComplete: () {
                    print("!!!!!!!!!!!!!!!! onEditingComplete");
                  },
                ),
                TextFormField(
                  decoration: InputDecoration(
                      labelText: "請(qǐng)輸入密碼"
                  ),
                  onSaved: (value) {
                    passWord = value;
                  },
                  obscureText: true,
                  autovalidate: true,
                  validator: (value) {
                    return value.length < 4 ? "密碼長度不夠4位" : null;
                  },
                ),
                Container(
                  margin: EdgeInsets.only(top: 20.0),
                  width: 200,
                  height: 40,
                  child: RaisedButton(
                    onPressed: dologin,
                    child: Text("登錄"),
                  ),
                )
              ],
            ),
          ),
        ),

/**
 * 表單
 *
 * const Form({
    Key key,
    @required this.child,
    this.autovalidate = false,//是否自動(dòng)提交表單
    this.onWillPop,
    this.onChanged,//當(dāng)FormFiled值改變時(shí)的回調(diào)函數(shù)
    })
 */

碼云地址：https://gitee.com/xgljh/Flutter.git