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I'm trying to make a simple game in Flash. So far, I've added a bunch of objects to the stage using addChild(objName);. However, now I'm trying to remove the objects completely. I don't want to have to cycle through every object's name and I'm sure there must be a more efficient way to select each object (maybe by index on the stage) and removeChildAt(index); it. However, when I try this, Flash only removes the objects that were manually placed by me on the stage. It doesn't remove the ones that were placed through code. I've done some searching and I tried multiple methods, all of which yield the same result. The one that most people agree on is this one:

while (numChildren > 0) 
{
   removeChildAt(0);
}

Can you help me figure out why this isn't removing anything that was coded onto the stage?

Thanks in advance :D

Edit: Here is my code for the frames:

Frame 1 (Randomly generates and displays the dots):

import flash.events.MouseEvent;
import fl.motion.easing.Linear;

var dotList = new Array(); var level:int = 3; var invisoDotList = new Array();
var loop:int;
var line:Line = new Line();
line.x = 274;
line.y = 187;
addChild(line);
for(loop = 0; loop < level; loop++)
{
    var dot:Dot = new Dot();
    var invisoDot:InvisoDot = new InvisoDot();
    var tester:Boolean = true;
    var xval:int = Math.floor(Math.random()*(1+520))+14;
    var looper:int = 0;
    while(looper < dotList.length)
    {
        if(Math.abs(xval - dotList[looper].x) > 30)//minimum spacing
        {
            looper++;
        }
        else
        {
            looper = 0;
            xval = Math.floor(Math.random()*(1+520))+14;
        }
    }
    dot.x = xval;
    dot.y = 187;
    invisoDot.x = xval;
    invisoDot.y = 187;
    invisoDot.alpha = 0;
    dotList[loop] = dot;
    invisoDotList[loop] = invisoDot;
    addChild(invisoDot);
    addChild(dot);
}
//trace(dotList); test to ensure that dots are added to the array
var nb1:NextButton = new NextButton();
nb1.x = 0;
nb1.y = 0;
nb1.alpha = 0;
addChild(nb1);
nb1.addEventListener(MouseEvent.CLICK, hideDots);

function hideDots(e:MouseEvent)
{
    for(var loop:int = 0; loop < dotList.length; loop++)
    {
        dotList[loop].alpha = 0;//make dots disappear
    }
    line.alpha = 0;
    nextFrame();
}
stop();

Frame 2 (Displays further instructions and contains a couple of methods that will be used later on):

import flash.events.MouseEvent;
removeChild(nb1);
var nb2:NextButton = new NextButton();
nb2.x = 0;
nb2.y = 0;
nb2.alpha = 0;
addChild(nb2);
nb2.addEventListener(MouseEvent.CLICK, next);

function next(e:MouseEvent)
{
    nextFrame();
}
function clearStage()
{
    while (numChildren > 0) 
    {
        trace("before" + numChildren);
        removeChildAt(0);
        trace("after" + numChildren);
    }
}
stop();

Frame 3 (Makes the dots disappear when they are clicked and keeps an accuracy count):

import flash.events.MouseEvent;
import flash.utils.Timer;
line.alpha = 1;
removeChild(nb2);
//setChildIndex(line,0);
var clicks:int = -1;
var passed:int = 0;
var fromLine:Boolean = false;
//trace(dotList.length);
stage.addEventListener(MouseEvent.CLICK, clickCount);
for(var loopvar:int = 0; loopvar < dotList.length; loopvar++)
{
    //trace("loop");
    dot = dotList[loopvar];
    invisoDot = invisoDotList[loopvar];
    dot.addEventListener(MouseEvent.CLICK, onClick);
    invisoDot.addEventListener(MouseEvent.CLICK, onClick);
    //trace("event");
}
//trace(dotList.length);
function onClick(e:MouseEvent)
{
    //e.currentTarget.alpha = .5;
    for(var hitcheck:int = 0; hitcheck < dotList.length; hitcheck++)
    {
        if(dotList[hitcheck].x == e.currentTarget.x)
        {
            dotList[hitcheck].alpha = 1;
        }
    }
    //trace("check");
}
var numChanged:int = 0;
function clickCount(e:MouseEvent)
{
    clicks++;
    //trace(clicks);
    numChanged = 0;
    for(var index:int = 0; index < dotList.length; index++)//check whether the user has gotten all the dots
    {
        if(dotList[index].alpha == 1)
        {
            numChanged++;
        }
    }
    if(numChanged == level)//if the user has gotten all the dots
    {
        /*trace("next screen for sucess");
        trace(clicks);*/
        line.visible = false;
        for(loop = 0; loop < dotList.length; loop++)
        {
            dotList[loop].alpha = 0;//make dots disappear
        }
        if((clicks - level) == 1)
        {
            passed = 2
        }
        else if((clicks - level) == 0)
        {
            passed = 1;
        }
        passed = 1;
        fromLine = true;
        nextFrame();
    }
    else if((clicks - numChanged) >= 2)//this ends the session as soon as 2 mistakes are made
    {
        /*trace("next screen for failed number of clicks");
        trace(clicks);*/
        line.visible = false;
        for(loop = 0; loop < dotList.length; loop++)
        {
            dotList[loop].alpha = 0;//make dots disappear
        }
        passed = 3;
        fromLine = true;
        nextFrame();
    }
    /*else if((clicks - level) >= 2)//if the user has made too many mistakes. This ends the session after the maximum number of tries have been used
    {
        trace("next screen too many clicks");
        trace(clicks);
    }*/

}
//trace("end");
stop();

Frame 4 (Generates the results table. A sidenote: there is a bug where "Okay" is never a result because in Frame 3, the value of passed never equals 2. Not sure why though):

import flash.text.TextFormat;
import flash.text.TextField;

var failFormat:TextFormat = new TextFormat();
failFormat.color = 0xFF0000;
failFormat.font = "Arial";
failFormat.size = 18;
var passFormat:TextFormat = new TextFormat();
passFormat.color = 0x00FF00;
passFormat.font = "Arial";
passFormat.size = 18;
var okayFormat:TextFormat = new TextFormat();
okayFormat.color = 0x808000;
okayFormat.font = "Arial";
okayFormat.size = 18;
var normalFormat:TextFormat = new TextFormat();
normalFormat.color = 0x000000;
normalFormat.font = "Arial";
normalFormat.size = 18;

var lineResults = new Array();
var squareResults = new Array();
trace(passed);
if(fromLine == true)
{
    if(passed == 1)
    {
        lineResults[lineResults.length] = "Pass";
    }
    else if(passed == 2)
    {
        lineResults[lineResults.length] = "Okay";
    }
    else if(passed == 3)
    {
        lineResults[lineResults.length] = "Fail";
    }

}
fromLine = false;
lineResults = lineResults.reverse();
squareResults = squareResults.reverse();
var loopLength:int = (lineResults.length >= squareResults.length) ? lineResults.length : squareResults.length;
var loopStart:int = 0;
if(loopLength > 11)
{
    loopStart = loopLength - 12
}
var cb:CellBlock = new CellBlock();
cb.x = 283.05;
cb.y = 20.35;
addChild(cb);
var col1Head:TextField = new TextField();
col1Head.defaultTextFormat = normalFormat;
col1Head.text = "# of Dots";
col1Head.x = 114.95
col1Head.y = 8.3;
addChild(col1Head);
var col2Head:TextField = new TextField();
col2Head.defaultTextFormat = normalFormat;
col2Head.text = "Line";
col2Head.x = 259.95
col2Head.y = 8.3;
addChild(col2Head);
var col3Head:TextField = new TextField();
col3Head.defaultTextFormat = normalFormat;
col3Head.text = "Square";
col3Head.x = 381.95
col3Head.y = 8.3;
addChild(col3Head);

for(loop = loopStart; loop < loopLength; loop++)
{
    var block:CellBlock = new CellBlock();
    block.x = 283.05;
    block.y = 20.35 + (loop - loopStart + 1)*33;
    addChild(block);
    var col2:TextField = new TextField();
    var col3:TextField = new TextField();
    var col1:TextField = new TextField();
    /*col2.defaultTextFormat = passFormat;
    col3.defaultTextFormat = okayFormat;*/
    col1.defaultTextFormat = normalFormat;
    switch(lineResults[loop])
    {
        case "Pass":
        col2.defaultTextFormat = passFormat;
        break;
        case "Okay":
        col2.defaultTextFormat = okayFormat;
        break;
        case "Fail":
        col2.defaultTextFormat = failFormat;
        break;
    }
    switch(squareResults[loop])
    {
        case "Pass":
        col3.defaultTextFormat = passFormat;
        break;
        case "Okay":
        col3.defaultTextFormat = okayFormat;
        break;
        case "Fail":
        col3.defaultTextFormat = failFormat;
        break;
    }
    //col2.text = "Pass";
    col2.text = lineResults[loop];
    col2.x = 260.95;
    col2.y = block.y - 12;
    addChild(col2);
    //col3.text = "Okay";
    try
    {
        col3.text = squareResults[loop];
    }
    catch(e:Error)
    {

    }
    col3.x = 386.95;
    col3.y = block.y - 12;
    addChild(col3);
    col1.text = String(loop + 1);
    col1.x = 133.95;
    col1.y = block.y - 12;
    addChild(col1);
}
var nb4:NextButton = new NextButton();
nb4.x = 0;
nb4.y = 0;
nb4.alpha = 0;
addChild(nb4);
nb4.addEventListener(MouseEvent.CLICK, clearStage);
stop();

Frame 5 (Next frame which is a test to make sure that everything gets erased, which it doesn't):

removeChild(nb4);
stop();
4

2 回答 2

1

这个错误：

ArgumentError：错误 #1063：Game_fla::MainTimeline/clearStage() 上的参数计数不匹配。预期 0，得到 1。 clearStage()

发生是因为您的clearStage()方法已添加为按钮的单击事件处理程序。如果您的clearStage()函数将用作事件处理程序，则它需要接受“事件”参数。所以你应该像这样定义函数：

function clearStage(event:Event)
{
    while (numChildren > 0) 
    {
        trace("before" + numChildren);
        removeChildAt(0);
        trace("after" + numChildren);
    }
}

作为旁注，这意味着如果您还想clearStage()手动调用，即使用它而不将其添加为事件处理程序，您将需要包含此event参数......但您可以只传入一个 null，因为您的代码不需要实际使用event参数：

clearStage(null);

我不确定我是否看到其他任何问题。我将首先将该事件参数添加到您的clearStage()函数中，如上所示。

我还应该补充一点，我主要在 Flex 或纯 AS3 中工作，并且在 Flash CS6 和时间轴编程方面不是超级熟练 :)

于 2013-06-02T18:48:02.433 回答
0

From memory, I don't think Flash re-orders when you remove a child. If you remove a child at index 0, every other child is still numbered 1 to x. childAt(0) is just null now. Keep that in mind with this sort of process.

于 2013-06-01T02:04:30.533 回答