动作脚本 3.0。如何从另一个类访问 MovieClips 对象？答案

【问题标题】：Action Script 3.0. How to access MovieClip object from another class?动作脚本 3.0。如何从另一个类访问 MovieClips 对象？
【发布时间】：2014-06-19 01:23:31
【问题描述】：

所以我有 2 个类 Main 和 Enemy。在 Enemy 类中，我需要使用在 Main 类中声明的变量。

这是我的 Main 类：

   public class Script extends MovieClip {
       var hero:MovieClip;
       var enemy:MovieClip; //These variables are only for example

       public function Game() {
                   hero.x = 100;
                   enemy.x = 200; // that's only example
   }
       function collisionDetected() {
                   enemy.hitBack(); // this is how I call hitBack function from Enemy class
   }

}

这是我的Enemy类：

public class Enemy extends MovieClip {
        private var count = 0;

        public function hitBack() {
            count = 0;
            this.addEventListener(Event.ENTER_FRAME, myEnterFrame);
        }

    private function myEnterFrame(e:Script)
    {
       if (count == 20) this.removeEventListener(Event.ENTER_FRAME, myEnterFrame);
       else 
       {
          count++;
          if (hero.x < enemy.x) { //here I need to use variables from Main class
            this.x -= 4;  
          }
           else {
            this.x += 4;  

          }
       }

    }

我收到以下错误：

1120: Access of undefined property hero.
1120: Access of undefined property enemy.

【问题讨论】：

标签： actionscript-3 flash class actionscript movieclip

【解决方案1】：

您需要将该计算移到 Main 类，或者您也可以将变量传递给敌人类。由于您的示例已被精简，我不确定在您的情况下什么是最好的，但我倾向于将计算移出，假设您有多个敌人试图这样做。

public class Script extends MovieClip {
       var hero:MovieClip;
       var enemy:MovieClip; //These variables are only for example

       public function Game() {
                   hero.x = 100;
                   enemy.x = 200; // that's only example
                   this.addEventListener(Event.ENTER_FRAME, enterFrame);
       }

       function collisionDetected() {
                   enemy.hitBack(); // this is how I call hitBack function from Enemy class
       }

       function enterFrame(e:Event){
            theEnemyMovieclipClass.myEnterCheck(hero,enemy);
       }




public class Enemy extends MovieClip {
        private var count = 0;

        public function hitBack() {
            count = 0;
        }

    public function myEnterCheck(hero,enemy)
    {
       if (count == 20) {
            // DO SOMETHING
       }
       else 
       {
          count++;
          if (hero.x < enemy.x) { //here I need to use variables from Main class
            this.x -= 4;  
          }
           else {
            this.x += 4;  

          }
       }

    }
}

这样，如果你有多个，你可以遍历所有这些并调用相同的方法 onEnterFrame。

【讨论】：