【Flex】自定义组件-combobox组件

1包结构

2 Test.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:local="*">
<fx:Declarations>
<!-- 将非可视元素（例如服务、值对象）放在此处 -->
</fx:Declarations>

<local:UnitedStates width="300">

</local:UnitedStates>
</s:Application>

3UnitedStates.mxml（新建-组件）

<?xml version="1.0" encoding="utf-8"?>
<mx:ComboBox xmlns:fx="http://ns.adobe.com/mxml/2009" 
             xmlns:s="library://ns.adobe.com/flex/spark" 
             xmlns:mx="library://ns.adobe.com/flex/mx"
             dataProvider="{this.statesCollection}"
             >
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
        <s:ArrayCollection id="statesCollection">
            <fx:Object stateCode="AK" label="Alaska"/>
            <fx:Object stateCode="AL" label="Alabama"/>
            <fx:Object stateCode="JS" label="江苏"/>
        </s:ArrayCollection>
    </fx:Declarations>
    
</mx:ComboBox>

 4任何没有直接包含在显示列表中的对象都必须在<fx:Declarations>标签中指定。在组件头声明数据来源

5引用的时候也可以是

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:control="*">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    
    <control:UnitedStates width="300">
        
    </control:UnitedStates>
</s:Application>

主要是绑定数据的声明问题。要保持一致。