Illustrator automation script for exporting an icon artboard to all the sizes needed for iOS apps.

SaveIconsForiOSIcons.jsx

var destFolder = null;
destFolder = Folder.selectDialog( 'Select the folder where you want to save the exported files.', app.activeDocument.path );

var baseDestName = app.activeDocument.name;

if (baseDestName.indexOf('.') < 0) 
{
    //nothing
} else {
    var dot = baseDestName.lastIndexOf('.');
    baseDestName = baseDestName.substring(0, dot);
}

var activeArtboard = app.activeDocument.artboards[app.activeDocument.artboards.getActiveArtboardIndex()];

if (destFolder != null)
{
	exportFileToPNG24(29,"Icon-Small");
	exportFileToPNG24(29*2,"Icon-Small@2x");	
	exportFileToPNG24(29*3,"Icon-Small@3x");	
	exportFileToPNG24(40,"Icon-Small-40");
	exportFileToPNG24(40*2,"Icon-Small-40@2x");	
	exportFileToPNG24(40*3,"Icon-Small-40@3x");	
	exportFileToPNG24(50,"Icon-Small-50");
	exportFileToPNG24(50*2,"Icon-Small-50@2x");	
	exportFileToPNG24(50*3,"Icon-Small-50@3x");		
	exportFileToPNG24(57,"Icon");
	exportFileToPNG24(57*2,"Icon@2x");	
	exportFileToPNG24(60,"Icon-60");
	exportFileToPNG24(72,"Icon-72");
	exportFileToPNG24(76,"Icon-76");	
	exportFileToPNG24(76*2,"Icon-76@2x");	
	exportFileToPNG24(120,"Icon-60@2x");
	exportFileToPNG24(144,"Icon-72@2x");	
	exportFileToPNG24(180,"Icon-60@3x");	
	exportFileToPNG24(512,"iTunesArtwork");
	exportFileToPNG24(512*2,"iTunesArtwork@2x");	
}

function exportFileToPNG24(iconSize, name) 
{ 
	var scale = iconSize / activeArtboard.artboardRect[2] * 100;
	
	if ( app.documents.length > 0 ) 
	{
		var exportOptions = new ExportOptionsPNG24();
		var type = ExportType.PNG24;
		var fileSpec = new File ("" + destFolder + "/" + name );
		exportOptions.verticalScale = scale;
		exportOptions.horizontalScale = scale;
		exportOptions.antiAliasing = true;
		exportOptions.transparency = true;
		exportOptions.artBoardClipping = true;
		app.activeDocument.exportFile (fileSpec, type, exportOptions);
	}
}