Flex4中动态生成RadioButton，绑定数据源

代码如下：

<?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"> 
    <s:layout> 
        <s:BasicLayout/> 
    </s:layout> 
  
    <fx:Script> 
        <![CDATA[ 
            import mx.controls.Alert; 
            import mx.events.FlexEvent; 
  
            protected function button1_clickHandler(event:MouseEvent):void
            { 
                Alert.show(radiogroup1.selectedValue.toString()); 
            } 
  
  
            protected function radiobutton1_creationCompleteHandler(event:FlexEvent):void
            { 
                      
                    var rb:RadioButton =event.currentTarget as RadioButton; 
                    if(rb==radiogroup1.getRadioButtonAt(0)) 
                    { 
                        rb.selected = true; 
                    } 
            } 
  
        ]]> 
    </fx:Script> 
  
  
    <fx:Declarations> 
          
        <fx:Array id="arr"> 
            <fx:Object label="北京" data="010" /> 
            <fx:Object label="上海" data="021" /> 
            <fx:Object label="天津" data="022" /> 
            <fx:Object label="重庆" data="023" /> 
            <fx:Object label="广州" data="020" /> 
        </fx:Array> 
              
        <s:RadioButtonGroup id="radiogroup1"  /> 
    </fx:Declarations> 
      
    <s:Button x="336" y="316" label="按钮" click="button1_clickHandler(event)"/> 
        <mx:VBox x="100" y="200" height="200" width="200" borderVisible="true" borderStyle="outset"> 
        <mx:Repeater dataProvider="{arr}"  id="radioRepeater" x="52" y="38"> 
            <s:RadioButton label="{radioRepeater.currentItem.label}" value="{radioRepeater.currentItem.data}" groupName="radiogroup1" creationComplete="radiobutton1_creationCompleteHandler(event)" /> 
        </mx:Repeater> 
        </mx:VBox> 
</s:Application>

1.首先先用fx:Array生成数据对象，fx:Array需要放在fx:Declarations声明部分

2.添加一个s:RadioButtonGroup，也需要放在fx:Declarations声明部分

3.添加一个mx:Repeater组件，并在mx:Repeater组件内添加一个s:RadioButton组件

给mx:Repeater组件设置数据源，那么数据源有几条数据，就会生成几个RadioButton

由于mx:Repeater组件必须包在基于Halo的容器中，所以还需要在mx:Repeater组件外包一个mx:VBox组件

4.通过radiogroup1.selectedValue.toString()，可以获取当前选择项的value值

5.如果需要默认绑定第一个RadioButton，可以在RadioButton组件添加creationComplete事件，监测如果是第一项，就选中