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当我尝试访问我的SparkSkin类(null reference)中的hostComponent的元素时出现错误。SparkSkin HostComponent - 空资源问题
我的itemRenderer：
<?xml version="1.0" encoding="utf-8"?>
<mx:VBox xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
horizontalAlign="center"
creationComplete="main()">
<fx:Script>
<![CDATA[
[Bindable]
public var progress:Number;
public function getProgress():Number
{
return [email protected];
}
//Define a property for returning the new value to the cell.
public var result:Boolean=false;
public function main():void{
progress = Number([email protected]);
editor.setProgress(Number([email protected]), 100);
}
]]>
</fx:Script>
<fx:Style source="../css/progressbar.css" />
<!-- Moving Progress Bar -->
<mx:ProgressBar id="editor" width="100%" height="20"
mode="manual" labelPlacement="center"
label="{Number([email protected]).toString()+'%'}"
barSkin="startkit.skin.CustomProgressBarSkin"
maskSkin="startkit.skin.CustomProgressBarSkin"/>
</mx:VBox>
我SparkSkin：
<?xml version="1.0" encoding="utf-8"?>
<s:SparkSkin name="CustomProgressBarSkin"
xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="main()">
<fx:Metadata>
<![CDATA[
[HostComponent("startkit.renderer.ProgressBarRenderer")]
]]>
</fx:Metadata>
<fx:Script>
<![CDATA[
import mx.controls.ProgressBar;
import mx.core.UIComponent;
import spark.components.supportClasses.ItemRenderer;
import startkit.renderer.ProgressBarRenderer;
override protected function initializationComplete():void {
useChromeColor = true;
super.initializationComplete();
}
public function main():void
{
trace(hostComponent.progress);
}
]]>
</fx:Script>
<!-- layer 1: fill -->
<s:Rect left="2" right="2" top="2" bottom="2" >
<s:fill>
<s:SolidColor color="#00FF00" />
</s:fill>
</s:Rect>
<!-- layer 2: border -->
<s:Rect left="2" right="2" top="2" bottom="2" >
<s:stroke>
<s:LinearGradientStroke rotation="90">
<s:GradientEntry color="0xFFFFFF" alpha="0.9" />
<s:GradientEntry color="0xFFFFFF" alpha="0.5" />
</s:LinearGradientStroke>
</s:stroke>
</s:Rect>
<!-- layer 3: right edge -->
<s:Rect right="1" top="2" bottom="2" width="1" >
<s:fill>
<s:SolidColor color="0x000000" alpha="0.55" />
</s:fill>
</s:Rect>
</s:SparkSkin>
当我尝试跟踪 “进步” 属性的 “hostComponent” 资源我得到这个错误：
TypeError: Error #1009: Il est impossible d'accéder à la propriété ou à la méthode d'une référence d'objet nul.
at startkit.skin::CustomProgressBarSkin/main()[C:\Documents and Settings\hduborper\Adobe Flash Builder 4.5\kit_demarrage\src\startkit\skin\CustomProgressBarSkin.mxml:28]
at startkit.skin::CustomProgressBarSkin/___CustomProgressBarSkin_SparkSkin1_creationComplete()[C:\Documents and Settings\hduborper\Adobe Flash Builder 4.5\kit_demarrage\src\startkit\skin\CustomProgressBarSkin.mxml:5]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\hero_private\frameworks\projects\framework\src\mx\core\UIComponent.as:13128]
at mx.core::UIComponent/set initialized()[E:\dev\hero_private\frameworks\projects\framework\src\mx\core\UIComponent.as:1818]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:842]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\hero_private\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1180]
我不知道会发生什么...请帮助我:)
您是否在调试模式下执行代码？问题是访问hostComponent变量还是进度变量？ – JeffryHouser
是的，我执行了我的cod ein调试模式，并且hostComponent是NULL。 我虽然定义hostComponent区域类型等认为： <！[CDATA [ [HostComponent（ “startkit.renderer.ProgressBarRenderer”）] ]]> –
ZuG