returnObject 不返回任何内容

发布于 2024-11-06 13:39:11 字数 479 浏览 2 评论 0原文

我正在使用最新的 SDK 4.5.0.20967。我之前曾使用过 SDK Hero。一切工作正常，但我的返回对象有问题。这是唯一不起作用的事情。

所以我有一个页面，我在其中创建 returnObject:

override public function createReturnObject():Object
        {
            return m_parameters;
        }

当我调试时，我看到我的 navigator.poppedViewReturnedObject = null。

var poppedViewReturnedObject:ViewReturnObject = navigator.poppedViewReturnedObject;

有人知道我做错了什么或有解决方案吗？

亲切的问候，

蒂博·海伦

原文

I'm working with the latest SDK 4.5.0.20967. I worked before with the SDK Hero.
Everything is working fine but I have a problem with my returndObject. That's the only thing that isn't working.

So I have a page where I make my returnObject:

override public function createReturnObject():Object
        {
            return m_parameters;
        }

When I debug I see that my navigator.poppedViewReturnedObject = null.

var poppedViewReturnedObject:ViewReturnObject = navigator.poppedViewReturnedObject;

Does anybody knows what I'm doing wrong or has a solution?

Kind regards,

Thibault Heylen

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幻梦 2024-11-13 13:39:11

poppedViewReturnedObject 仅在最初推送包含覆盖的 createReturnObject 方法的新视图的视图的 addHandler 中可用。

poppedViewReturnedObject 什么时候可用，即不为 null？当然，当调用 popview() 时。

如果您尝试在其他情况下访问 poppedViewReturnedObject，例如在 viewActivated 处理程序中，它将为 null。

代码示例：

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    add="addHandler(event)"
    viewActivate="viewActivateHandler(event)"
>
<fx:Script>
    <![CDATA[
        import mx.events.FlexEvent;

        import spark.events.ViewNavigatorEvent;

        protected function addHandler(event:FlexEvent):void
        {
            if (navigator.poppedViewReturnedObject==null){
                // do something
                var poppedViewReturnedObject:ViewReturnObject = navigator.poppedViewReturnedObject;
            }
        }
        protected function viewActivateHandler(event:ViewNavigatorEvent):void
        {
            // here , navigator.poppedViewReturnedObject is null
        }


    ]]>
</fx:Script>

poppedViewReturnedObject is available only in the addHandler of the view which originally pushed your new view containing the overriden createReturnObject method.

When will poppedViewReturnedObject be available, i.e., not null? When popview() is invoked of course.

If you try to access poppedViewReturnedObject in other circumstances, for instance in a viewActivated handler, it will be null.

Code sample:

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    add="addHandler(event)"
    viewActivate="viewActivateHandler(event)"
>
<fx:Script>
    <![CDATA[
        import mx.events.FlexEvent;

        import spark.events.ViewNavigatorEvent;

        protected function addHandler(event:FlexEvent):void
        {
            if (navigator.poppedViewReturnedObject==null){
                // do something
                var poppedViewReturnedObject:ViewReturnObject = navigator.poppedViewReturnedObject;
            }
        }
        protected function viewActivateHandler(event:ViewNavigatorEvent):void
        {
            // here , navigator.poppedViewReturnedObject is null
        }


    ]]>
</fx:Script>

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