Symbolizer is the easiest way of converting vector graphics to bitmap graphics. Drag a vector graphic to Symbolizer and it'll show a detailed preview of the image. On the righthand side there's a list of preconfigured icon sizes ready for use in Xcode. Drag a size from there to the target folder and you're done. Symbolizer will automatically take care of naming the file.
Supported file formats:
Yes you read that right: Text. Drop some formatted text on Symbolizer and export the rendered glyph like any other graphic. This feature requires the appropriate font to be installed, which means it will NOT work with text of a Web-Font from the web browser.