actionscript問題

Question

package com.rubenswieringa.interactivemindmap { 

    import flash.display.DisplayObject; 
    import flash.filters.BlurFilter; 
    import flash.text.TextField; 
    import flash.text.TextFieldAutoSize; 

    import mx.flash.UIMovieClip; 

    public class NodeRendererBase extends UIMovieClip { 

     private var _transparent:Boolean = false; 
     private var _text:String = ""; 

     private static const NUM_DEPTHS:uint = 5; 

     public function NodeRendererBase():void { 
      this.cacheAsBitmap = true; 
      // set settings for all TextFields: 
      var i:int; 
      var textField:TextField; 
      for (i=1; i<=NodeRendererBase.NUM_DEPTHS; i++){ 
       textField = this.getChildByName("textField"+i) as TextField; 
       textField.autoSize = TextFieldAutoSize.CENTER; 
      } 
     } 

     public function setSkinByID (id:String):Boolean { 
      this.gotoAndStop(id); 
      if (this.currentLabel != id){ 
       return false; 
      } 
      this.applyText(); 
      return true; 
     } 

     public function setSkinByDepth (depth:int):Boolean { 
      return this.setSkinByID("depth"+depth); 
     } 

     public function get text():String { 
      return this._text 
     } 
     public function set text (value:String):void { 
      if (this._text == value){ 
       return; 
      } 
      this._text = value; 
      this.applyText(); 
     } 

     /** 
     * 
     */ 
     private function applyText():void { 
      var i:int; 
      // this method is not needed if the item-renderer is not displaying a certain depth: 
      if (this.currentLabel.slice(0, 5) != "depth"){ 
       return; 
      } 
      // textField (TextField): 
      var textField:TextField; 
      for (i=1; i<=NodeRendererBase.NUM_DEPTHS; i++){ 
       textField = this.getChildByName("textField"+i) as TextField; 
       if (i.toString() == this.currentLabel.slice("depth".length)){ 
        textField.text = this._text; 
       }else{ 
        textField.text = ""; 
       } 
      } 
      // background (MovieClip): 
      var background:DisplayObject; 
      //for (i=1; i<=NodeRendererBase.NUM_DEPTHS; i++){ 
      for (i=1; i<=NodeRendererBase.NUM_DEPTHS; i++){ 
       background = this.getChildByName("background_mc"+i); 
       if (i.toString() == this.currentLabel.slice("depth".length)){ 
        textField = this.getChildByName("textField"+i) as TextField; 
        background.height = textField.height + (textField.y - background.y) * 2; 
       }else{ 
        background.visible = false; 
       } 
      } 
     } 

     public function setColor (index:int):void { 
      var background:DisplayObject = this.getChildByName("background_mc"+this.currentLabel.slice("depth".length)); 
      background['gotoAndStop'](index); 
     } 

     public function get transparent():Boolean { 
      return this._transparent; 
     } 
     public function set transparent (value:Boolean):void { 
      if (this._transparent == value){ 
       return; 
      } 
      this._transparent = value; 
      // set visuals: 
      var newFilters:Array = (value) ? [new BlurFilter(3, 3)] : []; 
      this.filters = newFilters; 
     } 

    } 

} 

如果我將private static const NUM_DEPTHS:uint = 5;更改爲5以外的任何值（我試圖增加它的值），則腳本將失敗。任何投入爲什麼？

Answer 1

我認爲這個問題就出在這裏：

for (i=1; i<=NodeRendererBase.NUM_DEPTHS; i++){ 
    textField = this.getChildByName("textField"+i) as TextField; 
    textField.autoSize = TextFieldAutoSize.CENTER; 
} 

基本上，當你增加NUM_DEPTHS的價值，你告訴這個循環中，將有超過5個文本框。大概情況並非如此，或者你創建了更多並且沒有正確命名它們（textField6,textField7等），因此在第五次迭代之後，對getChildByName()的調用將失敗。