使用SDK 4.1，我能够从一个自定义皮肤访问自定义按钮组件的自定义属性。我目前工作的项目需要SDK 4.5，我无法访问属性。这里有一个例子：

自定义按钮组件

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; S：ButtonBase的xmlns：FX =htt​​p://ns.adobe.com/mxml/2009
          XMLNS：S =库：//ns.adobe.com/flex/spark
          的xmlns：MX =库：//ns.adobe.com/flex/mx
          的skinClass =components.skins.ButtonIcon_Skin
          ＆GT;
    ＆LT; FX：声明＆GT;
        ＆LT; FX：字符串ID =iconCustom/＆GT;
    ＆LT; / FX：声明＆GT;
＆所述; /秒：ButtonBase＆GT;
 

自定义按钮外观

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; S：SparkButtonSkin的xmlns：FX =htt​​p://ns.adobe.com/mxml/2009
             XMLNS：S =库：//ns.adobe.com/flex/spark
             的xmlns：FB =htt​​p://ns.adobe.com/flashbuilder/2009
             =了minWidth21=了minHeight21
             中用alpha.disabled =0.5＆GT;
    ＆LT; FX：元数据＆GT; [HostComponent（components.ButtonIcon）＆LT; / FX：元数据＆GT;

...

    ＆LT; S：标签ID =测试{hostComponent.iconCustom}
             horizo​​ntalCenter =0底部=10/＆GT;

＆所述; /秒：SparkButtonSkin＆GT;
 

在code提示显示 hostComponent.iconCustom 但随后给出了错误：

 可能未定义的属性iconCustom通过与静态类型spark.components.supportClasses参考访问：ButtonBase。 ButtonIcon_Skin.mxml
 

解决方案

刚刚替换SparkButtonSkin一个普通的皮肤，你会就好了：

 ＆LT; S：皮肤的xmlns：FX =htt​​p://ns.adobe.com/mxml/2009
        XMLNS：S =库：//ns.adobe.com/flex/spark＆GT;

    ＆LT; FX：元数据＆GT;
        [HostComponent（components.ButtonIcon）]
    ＆LT; / FX：元数据＆GT;

    ＆LT; S：国家＆GT;
        ＆LT; S：国名=已禁用/＆GT;
        ＆LT; S：国名=向下/＆GT;
        ＆LT; S：国名=而不是/＆GT;
        ＆LT; S：国名=向上/＆GT;
    ＆LT; / S：国家＆GT;

    ＆LT; S：标签文本=测试{hostComponent.iconCustom}
             horizo​​ntalCenter =0底部=10/＆GT;

＆LT; / S：皮肤＆GT;
 

Using SDK 4.1 I was able to access custom properties of a custom button component from a custom skin. The project I'm currently working requires SDK 4.5 and I'm unable to to access the properties. Here's an example:

Custom Button Component

<?xml version="1.0" encoding="utf-8"?>
<s:ButtonBase xmlns:fx="http://ns.adobe.com/mxml/2009" 
          xmlns:s="library://ns.adobe.com/flex/spark" 
          xmlns:mx="library://ns.adobe.com/flex/mx"
          skinClass="components.skins.ButtonIcon_Skin"
          >
    <fx:Declarations>
        <fx:String id="iconCustom" />
    </fx:Declarations>
</s:ButtonBase>

Custom Button Skin

<?xml version="1.0" encoding="utf-8"?>
<s:SparkButtonSkin xmlns:fx="http://ns.adobe.com/mxml/2009" 
             xmlns:s="library://ns.adobe.com/flex/spark" 
             xmlns:fb="http://ns.adobe.com/flashbuilder/2009"
             minWidth="21" minHeight="21" 
             alpha.disabled="0.5">
    <fx:Metadata>[HostComponent("components.ButtonIcon")]</fx:Metadata>

...

    <s:Label id="test" {hostComponent.iconCustom}" 
             horizontalCenter="0" bottom="10" />

</s:SparkButtonSkin>

The code hint shows hostComponent.iconCustom but then gives the error :

Access of possibly undefined property iconCustom through a reference with static type spark.components.supportClasses:ButtonBase. ButtonIcon_Skin.mxml

Just replace that SparkButtonSkin with a regular Skin and you'll be just fine:

<s:Skin xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark">

    <fx:Metadata>
        [HostComponent("components.ButtonIcon")]
    </fx:Metadata>

    <s:states>
        <s:State name="disabled" />
        <s:State name="down" />
        <s:State name="over" />
        <s:State name="up" />
    </s:states>

    <s:Label text="test {hostComponent.iconCustom}" 
             horizontalCenter="0" bottom="10" />

</s:Skin>