flex小技巧综合

flex 小技巧
1. 将组件放到最上层
  父容器.setChildIndex(你要的TitleWindow,父容器.numChildren- 1);

2.array的赋值：
  1.可以长度不一致
  2.可以变量
  3.可以push空数组 push([])
  e.g.
                               

     var aa:int = 1;
 				var a:Array = [aa,2,3];
 				var b:Array = [2,3];
 				var c:Array = [1,2,3,4];
 				array.push(a);
 				array.push(b);
 				array.push(c);
 				array.push([aa,aa,aa]);
 				array.push([]);

3.禁止下拉框
  verticalScrollPolicy="off" horizontalScrollPolicy="off"

4.变量的访问ArrayCollection中的值
  ArrayCollection["name"]

5.画点
 

				var circle :Sprite = new Sprite();
				var comp:UIComponent = new UIComponent();
				circle.graphics.beginFill(0xDC143C);
				circle.graphics.drawCircle(x,y,r);
				comp.addChild(circle);
				worldmap.addChild(comp);

6.画边界

    			var bounds:Sprite = new Sprite();
    			bounds.graphics.beginFill(0x000000);
    			bounds.graphics.drawRect(x1,y1,w1,h1);
    			bounds.graphics.drawRect(x2,y2,w2,h2);
    			bounds.graphics.endFill();
    			var comp:UIComponent = new UIComponent();
    			comp.addChild(bounds);
    			panel.addChild(comp);

7.arrayCollection排序

             import mx.collections.SortField;  
             import mx.collections.Sort;  
             import mx.collections.ArrayCollection;  
             private var acSort:ArrayCollection=  
             new ArrayCollection([{id:0,userName:"zhangSan",age:21},  
                                 {id:2,userName:"liSi",age:24},  
                                {id:1,userName:"wangWu",age:31}]);  
               
               
             private function sortAc():ArrayCollection{  
                 var sort:Sort=new Sort();  
                 //按照ID升序排序  
                 sort.fields=[new SortField("id")];  
                   
                 //按照userName降序排序  
                 sort.fields=[new SortField("userName",true,true)];  
                   
                 //先按ID升序,再按userName降序  
                 sort.fields[new SortField("id"),new SortField("userName",true,true)];  
                 acSort.sort=sort;  
                 acSort.refresh();//更新  
                 return acSort;  
             }  

7.设置Alert的字体样式

    <mx:Style>
        Alert{
            titleStyleName: "alertTitle";
            messageStyleName: "alertMessage";
            buttonStyleName: "alertButton";
            cornerRadius: 10;
            embedFonts: true;
        }
        .alertTitle {
            letterSpacing: 0;
            fontSize: 14;
            color: red;
        }
        .alertMessage {
            letterSpacing: 2;
            fontSize: 14;
            fontWeight: bold;
            color: #000000;
        }
        .alertButton {
            letterSpacing: 0;
            fontSize: 12;
            fontWeight: normal;
            color: black;
        }
    </mx:Style>

8.读JSON串的键值

                var obj:Object = JSON.decode(jsonString);
                for each(var key:String in obj){
                    trace("key:"+key+" value:"+obj[key]);
                }