ActionScript - 补间问题

Question

以下代码返回以下运行时错误。为什么呢？

代码：

package
{
import flash.display.Sprite;
import fl.transitions.Tween;
import fl.transitions.easing.Regular;
import fl.transitions.TweenEvent;

public class Test extends Sprite
    {
    private var myNumber:Number;
    private var myTween:Tween;

    public function Test()
        {
        myNumber = -12;
        myTween = new Tween(this, "myNumber", Regular.easeIn, myNumber, 0, 5, true);
        myTween.addEventListener(TweenEvent.MOTION_CHANGE, tweenChangeEventHandler);
        }

    private function tweenChangeEventHandler(evt:TweenEvent):void
        {
        trace(myNumber)
        }
    }
}

运行时错误：

ReferenceError: Error #1056: Cannot create property myNumber on Test.
    at fl.transitions::Tween/setPosition()
    at fl.transitions::Tween/set position()
    at fl.transitions::Tween()
    at Test()

Answer 1

它认为Tween需要公共变量（或getter / setter）才能更改它们。尝试将变量更改为公共变量。