动态附加的文本区域抛出错误#1009 - 但类似的标签和文本输入不会

Question

我场景中的这段代码与评论完美配合：

import state;
import fl.controls.TextInput;
import fl.controls.TextArea;
import flash.events.TextEvent;

state.data.newNotice = new Object();
state.data.newNotice.title='';
state.data.newNotice.text='';

var noticeTitleInput:TextInput = new TextInput();
noticeTitleInput.width = noticeTitleEditor.width;
noticeTitleInput.height = noticeTitleEditor.height;
noticeTitleInput.text = '';
noticeTitleInput.setStyle("textFormat", state.data.fontFormat);
noticeTitleEditor.addChild(noticeTitleInput);

noticeTitleInput.addEventListener(TextEvent.TEXT_INPUT, onInput);

/*var noticeTextInput:TextArea = new TextArea();
noticeTextInput.wordWrap = true;
noticeTextInput.width = noticeEditor.width;
noticeTextInput.height = noticeEditor.height;
noticeTextInput.text = '';
noticeTextInput.setStyle("textFormat", state.data.fontFormat);
noticeEditor.addChild(noticeTextInput);

noticeTextInput.addEventListener(TextEvent.TEXT_INPUT, onInput);*/

function onInput(event:TextEvent):void {
    state.data.newNotice.title = noticeTitleInput.text;
//  state.data.newNotice.text = noticeTextInput.text;
}

虽然取消注释，但文本区域会抛出错误：

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at fl.controls::TextArea/drawLayout()
    at fl.controls::TextArea/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/drawNow()
    at fl.controls::ScrollBar/draw()
    at fl.controls::UIScrollBar/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::LabelButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/drawNow()
    at fl.controls::ScrollBar/draw()
    at fl.controls::UIScrollBar/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::LabelButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()
TypeError: Error #2007: Parameter child must be non-null.
    at flash.display::DisplayObjectContainer/addChildAt()
    at fl.controls::BaseButton/drawBackground()
    at fl.controls::BaseButton/draw()
    at fl.core::UIComponent/callLaterDispatcher()

我不明白为什么这不适用于文本区域，因为同样的模式对我适用于标签和文本输入。有什么问题吗？

Answer 1

Flash 组件需要 2 个东西：组件类和当您从其面板拖动组件时添加到库中的组件图形。有些组件需要一些额外的资产，因此如果它们出于某种原因（被错误删除或其他原因）不在库中，可能会导致运行时错误 and/or 非功能性组件。

开发者应始终保持库井井有条！

动态附加的文本区域抛出错误#1009 - 但类似的标签和文本输入不会

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actionscript-3