エラー＃2007：パラメータantiAliasTypeがnullでない必要があります

Question

ItemRendererにこの奇妙なエラーメッセージが表示されています。私は何が間違っているのか分かりませんか？ 助けてください！

TypeError：Error＃2007：パラメータantiAliasTypeはnullでなくてはなりません。 でflash.text ::のTextField /設定antiAliasType（）

package xxx 
{ 
    import spark.components.LabelItemRenderer; 
    import spark.components.supportClasses.StyleableTextField; 

    public class NewsItemRenderer extends LabelItemRenderer 
    { 

     private var date:StyleableTextField; 
     private var title:StyleableTextField; 

     public function NewsItemRenderer() 
     { 
      super(); 
      super.styleName = "NewsItemRenderer"; 
     } 

     override protected function createChildren():void { 
      date = StyleableTextField(createInFontContext(StyleableTextField)); 
      date.editable = false; 
      date.selectable = false; 
      date.styleName = "newsItemDate"; 
      date.width = 200; 
      date.height = 20; 
      date.styleDeclaration = styleManager.getMergedStyleDeclaration(".newsItemDate"); 
      addChild(date); 
      date.commitStyles(); 

      title = StyleableTextField(createInFontContext(StyleableTextField)); 
      title.editable = false; 
      title.selectable = false; 
      title.styleName = "newsItemTitle"; 
      title.width = 200; 
      title.height = 60; 
      title.styleDeclaration = styleManager.getMergedStyleDeclaration(".newsItemTitle"); 
      addChild(title); 
      title.commitStyles(); 
     } 

     override protected function layoutContents(unscaledWidth:Number, unscaledHeight:Number):void 
     { 
      super.layoutContents(unscaledWidth, unscaledHeight); 
      // Hide the default label display 
      if (labelDisplay) { 
       labelDisplay.visible = false; 
      } 
      setElementPosition(date, 5, 5); 
      setElementPosition(title, 5, 20); 
      setElementSize(date, measuredWidth, 20); 
      setElementSize(title, measuredWidth, 60); 
     } 

     override protected function drawBackground(unscaledWidth:Number, 
              unscaledHeight:Number):void 
     { 
      // nada -> transparent 
     } 

     override protected function measure():void 
     { 
      measuredHeight = 80; 
      measuredWidth = 300; 
      measuredMinWidth = 200; 
      measuredMinHeight = measuredHeight; 
     } 

     override public function set data(value:Object):void 
     { 
      trace(value); 
      super.data = value; 
      if(value != null) 
      { 
       var xml:XML = XML(value); 
       date.text = xml.@pubDate[0]; 
       title.text = xml.@title[0]; 
      } 
     } 
    } 
} 

    TypeError: Error #2007: Parameter antiAliasType must be non-null. 
      at flash.text::TextField/set antiAliasType() 
      at spark.components.supportClasses::StyleableTextField/commitStyles()[E:\dev\4.y\frameworks\projects\mobilecomponents\src\spark\components\supportClasses\StyleableTextField.as:1068] 
      at xxx::NewsItemRenderer/createChildren()[C:\workspaces\flexm\FlexMobile\src\xxx\NewsItemRenderer.as:27] 
      at mx.core::UIComponent/initialize()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:7634] 
      at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:7495] 
      at mx.core::UIComponent/addChild()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:7176] 
      at spark.components::DataGroup/initializeTypicalItem()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\DataGroup.as:326] 
      at spark.components::DataGroup/ensureTypicalLayoutElement()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\DataGroup.as:384] 
      at spark.components::DataGroup/measure()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\DataGroup.as:1467] 
      at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::measureSizes()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8506] 
      at mx.core::UIComponent/validateSize()[E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:8430] 
      at mx.managers::LayoutManager/validateSize()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:665] 
      at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:816] 
      at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.y\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180] 

.newsItemDate { 
    color: black; 
    fontSize: 20; 
    fontWeight: normal; 
} 
.newsItemTitle { 
    color: white; 
    fontSize: 20; 
    fontWeight: normal; 
} 

Answer 1

date.styleName = this; 
title.styleName = this; 

これは