TextField

TextField(
              controller: TextEditingController.fromValue(TextEditingValue(
                text: rssUrl,selection: TextSelection.collapsed(offset: rssUrl.length),
              )),
              onSubmitted: (String input){
                rssUrl = input;
                //TODO 输入了rss地址
              },
              onChanged: (String input){
                rssUrl = input;
              },
              maxLines: 1,
              decoration: InputDecoration(
                contentPadding: const EdgeInsets.all(16.0),
                hintText: '请输入',
                hintStyle: TextStyle(fontSize: 16.0,height: 1.0,color: itemTextColor),
                focusedBorder: OutlineInputBorder(
                  borderSide: BorderSide(color: Theme.of(context).primaryColor ),
                  borderRadius: BorderRadius.circular(8.0),
                ),
                enabledBorder: OutlineInputBorder(
                  borderSide: BorderSide(color:itemTextColor ),
                  borderRadius: BorderRadius.circular(8.0),
                ),
              ),
              style: TextStyle(fontSize: 16.0,height: 1.0,color: itemTextColor),
            ),

SizedBox(
  width: 200.0,
  child: TextField(
    onChanged: (input){
        _accountInput(context,input);
    },
    onSubmitted: (input){
        _accountInput(context,input);
    },
    textInputAction: TextInputAction.done,//键盘显示完成按钮
    style: TextStyle(color: Colors.black87, fontSize: 14.0),//输入的文字颜色
    textAlign: TextAlign.center,//文字位置
    maxLines: 1,//最大行
    keyboardType: TextInputType.number,//可输入的键盘类型
    decoration: InputDecoration(
      hintText: "请输入11位手机号码",//hint
      hintStyle: TextStyle(color: Colors.grey, fontSize: 14.0),//hint央视
      contentPadding: EdgeInsets.all(10.0),//文本padding
      enabledBorder: UnderlineInputBorder(//默认的装饰线OutlineInputBorder
        borderSide: BorderSide(width: 0.8, color: Colors.green),
      ),
      focusedBorder: UnderlineInputBorder(//获得焦点之后的装饰线
        borderSide: BorderSide(width: 0.8, color: Colors.green),
      ),
    ),
  ),
),