强制MXProgressBar的更新呈现？-ForcingupdaterenderingofMXProgressBar?

In Flex, the screen is never updating while Actionscript code is running. It basically works like this:

在Flex中,当Actionscript代码运行时,屏幕永远不会更新。它基本上是这样的:

1. Execute all runnable Actionscript code.

执行所有可运行的Actionscript代码。

2. Update the screen.

更新屏幕。

3. Repeat continuously.

To learn more details, google for [flex elastic racetrack]. But the above is the nut of what you need to understand.

要了解更多详情,请访问[flex elastic racetrack]。但以上是您需要了解的内容。

If you don't want a long-running piece of code to freeze the screen, you'll have to break it up into chunks and execute them across multiple frames, perhaps within a FRAME_ENTER event handler.

如果您不希望长时间运行的代码冻结屏幕,则必须将其分解为块并在多个帧中执行它们,可能在FRAME_ENTER事件处理程序中。

I am not sure what exactly is the problem. I tried the following code and it works without any need to validateNow.

我不确定究竟是什么问题。我尝试了以下代码,它无需验证即可运行。

  protected function button2_clickHandler(event:MouseEvent):void
  {
        for(var n:int = 0; n <100; n = n+20){
        progressBar.setProgress(n, 100);
        progressBar.label = "Hello World " + n;
        // progressBar.validateNow(); 
        }
  }