Can you post the code that you're using?

Also see - http://docs.unity3d.com/Documentation/ScriptReference/index.Script_compilation_28Advanced29.html to review calling between C# and JS.

and - http://answers.unity3d.com/questions/228518/desktopios-and-android-script-differences.html

Be sure to use explicit typing.

You're welcome - so you got it working on iPhone?

Thanks David and Nalin for giving me your precious time. I posted the code earlier but somehow its not visible as you can see my previous post was blank.

The problem and the main difference between android and ios is (what i think) that Ios takes pragma strict more seriously than android. And that was the case here. The java script could easily call the c sharp script that handles the behaviour but in Iphone it had problems accessing variables c sharp script.

Thanks for pointing that out David.

This is the javascript that downloads and instantiates the object and makes it a child of Empty GameObject "Parent"

 #pragma strict

var www : WWW;

var download : WWW;

var url : String;

var guiOffset = 20;

var assetBundle : AssetBundle;

var instanced : GameObject;

var customGUIstyledownload : GUISkin;

private var goParent : GameObject;

function StartDownload () {

www = new WWW ("file:///mnt/sdcard/AssetBundles/selected.txt");

        yield www;

        url = www.text;

if (Application.platform==RuntimePlatform.Android)

download = WWW.LoadFromCacheOrDownload("file:///mnt/sdcard/AssetBundles/"+url,1);

yield download;

assetBundle = download.assetBundle;

if (assetBundle != null)

{ var go : GameObject = assetBundle.mainAsset;

goParent = GameObject.Find("Parent");

if (go != null)

{

instanced = Instantiate(go);

instanced.transform.parent = goParent.transform;

instanced.transform.localPosition = new Vector3(0.0f,0.125f,0.0f);

instanced.transform.localScale= new Vector3(0.5f,0.5f,0.5f);

instanced.transform.localRotation = Quaternion.identity;

}

else

Debug.Log("Couldnt load resource");

}

else

{

Debug.Log("Couldnt load resource");

}

}

function Destroydownload()

{

                Destroy(instanced);

// Dispose the WWW class

download.Dispose();

download = null;

// Unload the whole asset bundles and any loaded assets

assetBundle.Unload (true);

assetBundle = null;

        }

function OnGUI()

{

if (download == null)

{

if (GUI.Button(Rect(40,20,200,40),"Download ",customGUIstyledownload.button))

{StartDownload();

 Debug.Log("Start Download");

}

}

else

{

if (download.error == null)

{

var progress = parseInt(download.progress * 100);

GUILayout.Label(progress + "%");

if (download.isDone && GUI.Button(Rect(40,20,200,40),"Unload Resource",customGUIstyledownload.button))

{

Destroydownload();

}

}

else

{

GUILayout.Label(download.error);

}

}

}

and further I am making the Empty GameObject a child of DataSetTrackableBehaviour.gameObject as posted earlier. This setupt works fine in android but for Ios I've applied a workaround by observing a value that changes in OnTrackingFound() and OnTrackingLost() and making my gameObject visible/invisible accordingly.

Thanks for the info.I'll try that.

Not sure what this problem is, but best practice is to sync up Unity versions between PC and MAC, so you might want to give it a try.  It's also possible to install multiple Unity Versions on a mac by just renaming the existing installation in the Applications directory prior to installing.

N

The only odd thing is that my script for instantiating the object from assetBundle is written in js. And in it I am not making the downloaded model a child of trackable instead I am making it a child of Empty GameObject and then in another script I am making the Empty GameObject the child of Trackable. Something like this...

1.Downloaded Model(Child of)---2.Empty GameObject(Child of)----Trackable. The first part is wriiten in js and the second part is written in cs.

This setup works fine in Android but why not in Ios? Although this is more of a Unity Question but I wanted to know the difference in Both of these Platforms. 

Or is it totally different? I am really confused...for now I've applied a workaround for this problem but would really wanna know what is the core problem. Is it something related to the version of Unity?

Please have your thoughts over it....