Question

我做了一个自定义类，我想创建一个movieclip的x实例。但以下不起作用：

package {



import flash.display.MovieClip;
public class CustomClass extends MovieClip {

    public function CustomClass(amount:uint) {  
        var Collector:Array = new Array(); 

        //Add and position Tiles to stage.
        for (var i:uint = 1; i <= amount; i++){ 
            var newMovieClip:MovieClip = new MovieClip;
            newMovieClip.y = amount * 10;
            Collector.push(newMovieClip); 
        }
        addChild(Collector);
    }
}

import flash.display.MovieClip; public class CustomClass extends MovieClip { public function CustomClass(amount:uint) { var Collector:Array = new Array(); //Add and position Tiles to stage. for (var i:uint = 1; i <= amount; i++){ var newMovieClip:MovieClip = new MovieClip; newMovieClip.y = amount * 10; Collector.push(newMovieClip); } addChild(Collector); } }

我想用

将它们放在时间轴上

var customClass_mc:CustomClass = new CustomClass(10);
addChild(customClass_mc);

//try to trace the x position of one of the instances. 
trace(customClass_mc.Collector[5].x);

我一直收到错误：场景1，图层'第1层'，第1帧，第5行1119：通过静态类型CustomClass的引用访问可能未定义的属性收集器。

Answer 1

首先，您需要将Collector声明为public：

public var Collector:Array = new Array();

您的收集器是一个数组，而不是显示对象，因此无法将其添加到显示树中。相反，您可以将每个newMovieClip推送到Custom类的显示上，并将它们放在for循环中。然后你根本不需要收集器，因为你可以使用getChildAt()：

来定位动画片段

trace(customClass_mc.getChildAt(5).x);

Answer 2

我自己找到了另一个答案，我觉得它更好！

根本不需要容器。

使用以下

时

package {

    import flash.display.MovieClip;
    public class CustomClass extends MovieClip {

        public function CustomClass(amount:uint) {  

            //Add and position Tiles to stage.
            for (var i:uint = 1; i <= amount; i++){ 
                var newMovieClip:MovieClip = new MovieClip;
                newMovieClip.y = amount * 10;
                newMovieClip.name = "clip"+i;
                addChild(newMovieClip); 
            }
        }
    }
}

不，我可以使用以下方式访问动画片段：

var customClass_mc:CustomClass = new CustomClass(10);
addChild(customClass_mc);

//try to trace the x position of the fifth instance. 
trace(customClass_mc.getChildByName("child5").y);

Answer 3

变量'Collector'仅在构造函数中以您拥有它的方式可用。必须公开收藏家才能从时间线外访问。最好的办法是制作一个公共getter方法来访问它。如下所示：

import flash.display.MovieClip;
public class CustomClass extends MovieClip {

    private var Collector:Array = new Array(); 

    public function get Collector():Array
    {
        return Collector;
    }

    public function CustomClass(amount:uint) {  

        //Add and position Tiles to stage.
        for (var i:uint = 1; i <= amount; i++){ 
            var newMovieClip:MovieClip = new MovieClip;
            newMovieClip.y = amount * 10;
            Collector.push(newMovieClip); 
        }
        addChild(Collector);
    }
}

AS 3.0动态实例名称

3 个答案: