从内存中删除 Object  (二)

从内存中删除Object (二)
jackgun_at_126.com


看看来自 Essential.ActionScript.3.0 的一段：

To avoid unnecessary code execution in discarded objects, a program should always
deactivate objects before discarding them. Deactivating an object means putting the
object in an idle state where nothing in the program can cause it to execute code. For
example, to deactivate an object, we might perform any or all of the following tasks:

    • Unregister the object’s methods for events
    • Stop all timers and intervals
    • Stop the playhead of timelines (for instances of movie clips created in the Flash authoring tool)
    • Deactivate any objects that would become unreachable if the object, itself, became unreachable

这样先前的代码改成:

Test 类 加一个停止 Timer 的 function

package { 
      import flash.display.Sprite; 
      import flash.utils.Timer; 
      import flash.events.TimerEvent; 

      public class Test extends Sprite { 

          private var time : Timer; 
          private var i : int = 0; 

          public function Test() : void { 
                 time = new Timer(500, 0); 
                 time.addEventListener("timer", runmovie); 
                 time.start(); 
           } 

           private function runmovie(event : TimerEvent) : void { 
                 i++; 
                 trace("---testing....." + i); 
          } 

           //加一个停止 Timer 的function 
           public function stopTimer() : void { 
                 time.stop(); 
           } 
      }
}


移除 testobj 前先停止 Timer

package { 
      import flash.display.MovieClip; 
      import flash.utils.Timer; 
      import flash.system.System; 
      import flash.events.TimerEvent; 

      public class MainDocumentClass extends MovieClip { 
           public var testobj : Test; 
           private var time : Timer; 
           private var i:int=0; 

           public function MainDocumentClass() : void { 
                 testobj = new Test(); 
                 addChild(testobj); 
                 time = new Timer(500, 0); 
                 time.addEventListener("timer", runmovie); 
                 time.start(); 
           } 

           private function runmovie(_event : TimerEvent) : void { 
                i++; 
                if(i==6){ 
                     //删除 testobj 时先停止 Test 的 Timer 
                      testobj.stopTimer(); 
                      trace("移除 testobj"); 
                      removeChild(testobj); 
                     testobj=null; 
                 } 
                 trace("==" + System.totalMemory); 
           } 
      }
}

    这样就可以等待回收机制把它干掉了，至于什么时候干掉…天知道…
要反复使用同一个类时最好用单例模式。

[本日志由 jack 于 2007-09-04 06:59 PM 编辑]
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Tags: as3as3 内存内存 删除删除 回收回收
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