flex动态加载使用css文件实例
1、 css_dynaset.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/halo"   minWidth="1024" minHeight="768"   creationComplete="init();"><fx:Script><![CDATA[import mx.styles.StyleManager;import mx.collections.ArrayCollection;/*由于css文件不自动编译成.swf文件，因此每保存好一次记得就要手动编译一次*/private function init():void{var array:Array = new Array();array.unshift({label:"红", selfColor:"red.swf"});    //必须以label为名array.unshift({label:"绿", selfColor:"green.swf"});array.unshift({label:"蓝", selfColor:"blue.swf"});comboBoxID.dataProvider = new ArrayCollection(array);}private function loadStyles(styleURL:String):void{StyleManager.loadStyleDeclarations(styleURL);    //动态加载css的函数}]]></fx:Script><mx:ComboBox id="comboBoxID" x="500" y="50" prompt="Please select a style" change="loadStyles(comboBoxID.selectedItem.selfColor);"/></s:Application>

2、 blue.css

/* CSS file */@namespace s "library://ns.adobe.com/flex/spark";@namespace mx "library://ns.adobe.com/flex/halo";/* blue.css */s|Application{ backgroundColor: haloBlue;}

3、 green.css

/* CSS file */@namespace s "library://ns.adobe.com/flex/spark";@namespace mx "library://ns.adobe.com/flex/halo";/* green.css */s|Application{ backgroundColor: haloGreen;}

4、 red.css

/* CSS file */@namespace s "library://ns.adobe.com/flex/spark";@namespace mx "library://ns.adobe.com/flex/halo";/* red.css */s|Application{ backgroundColor: red;}