从DatePicker中删除时间

Question

我想从DatePicker中删除时间，我尝试过此操作，但是遇到此错误“ getter day被调用为null”，我正在使用firbase profile.date中的初始日期。

DateFormat和TextEditingController：

 <div id = "sectionControls">
  <h1>Display Sections</h1>
  <div class = "leftCol">
  <p id ="96BackpackBlowerText">Backpack Blower</p>
  <p>Handheld and Backpack Blowers</p>
  <p>Chainsaw</p>
  <p>Hedge Trimmer</p>
  <p>Trimmer</p>
  <p>Accessories</p>
  <p>PAS</p>
  <p>Cordless</p>
</div>

<div class = "rightCol">
  <input type="button" class = "section-info-button" value="i" id = "backpackBlowerSectionInfoBtn" onclick ="showBackpackBlowerSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addBackpackBlowerSectionBtn" onclick="addBackpackBlowerSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeBackpackBlowerSectionBtn" onclick="removeBackpackBlowerSection()">

  <br>

  <input type="button" class = "section-info-button" value="i" id = "handheldAndBackpackBlowerSectionInfoBtn" onclick ="showHandheldAndBackpackBlowerSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addHandheldAndBackpackBlowerSectionBtn" onclick="addHandheldAndBackpackBlowerSection()">
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeHandheldAndBackpackBlowerSectionBtn" onclick="removeHandheldAndBackpackBlowerSection()">

  <br>

  <input type="button" class = "section-info-button" value="i" id = "chainsawSectionInfoBtn" onclick ="showChainsawSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addChainsawSectionBtn" onclick="addChainsawSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeChainsawSectionBtn" onclick="removeChainsawSection()"> 

  <br>

  <input type="button" class = "section-info-button" value="i" id = "hedgeTrimmerSectionInfoBtn" onclick ="showHedgeTrimmerSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addHedgeTrimmerSectionBtn" onclick="addHedgeTrimmerSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeHedgeTrimmerSectionBtn" onclick="removeHedgeTrimmerSection()"> 


  <br>

  <input type="button" class = "section-info-button" value="i" id = "trimmerSectionInfoBtn" onclick ="showTrimmerSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addTrimmerSectionBtn" onclick="addTrimmerSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeTrimmerSectionBtn" onclick="removeTrimmerSection()"> 

  <br>

  <input type="button" class = "section-info-button" value="i" id = "accessoriesSectionInfoBtn" onclick ="showAccessoriesSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addAccessoriesSectionBtn" onclick="addAccessoriesSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeAccessoriesSectionBtn" onclick="removeAccessoriesSection()"> 

  <br>

  <input type="button" class = "section-info-button" value="i" id = "pasSectionInfoBtn" onclick ="showPasSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addPasSectionBtn" onclick="addPasSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removePasSectionBtn" onclick="removePasSection()"> 

  <br>

  <input type="button" class = "section-info-button" value="i" id = "cordlessSectionInfoBtn" onclick ="showCordlessSectionInfo()">
  <input type="button" class = "section-button" value="+" id = "addCordlessSectionBtn" onclick="addCordlessSection()"> 
  <input type="button" class = "section-button section-remove-button" value="-" id = "removeCordlessSectionBtn" onclick="removeCordlessSection()"> 
</div>
</div>

这是调用对话框的地方：

var myFormat = DateFormat('d-MM-yyyy');
TextEditingController _datecontroller = new TextEditingController();

和selectDate函数：

ListTile(
  title: Text('Select DOB'),
  leading: Icon(Icons.calendar_today),
  subtitle: TextField(
    controller: _datecontroller,
    decoration: InputDecoration(
      hintText: ('${myFormat.format(_profile?.dob)}'),
    ),
  ),
  onTap: () => _selectDate(context),
),