Photoshop script to resize images for iOS app

iOS Images

try {

    doc = app.activeDocument;

    if (doc == null)
    {
        throw "Something is wrong with the current active document.  Make sure it's a valid PSD file.";
    }

    var fileName = prompt("Enter file name please", doc.name);

    // Trim all pransparent pixels
    doc.trim(TrimType.TRANSPARENT);

    // Save as 2x
    var sfw = new ExportOptionsSaveForWeb();
    sfw.format = SaveDocumentType.PNG;
    sfw.PNG8 = false; // use PNG-24
    sfw.transparency = true;
    doc.info = null;  // delete metadata
    var destFileName = fileName + "@2x.png";
    doc.exportDocument(new File("~/Desktop/" + destFileName), ExportType.SAVEFORWEB, sfw);

    // Resize to 1x
    doc.resizeImage(doc.width/2, doc.height/2);
    destFileName = fileName + ".png";
    doc.exportDocument(new File("~/Desktop/" + destFileName), ExportType.SAVEFORWEB, sfw);

    doc.close(SaveOptions.DONOTSAVECHANGES);
} catch (exception) {
    if ((exception != null) && (exception != ""))
        alert(exception);
} finally {

}