I know this is more of an angular 2 issue, but it says in the angular 2 documenation for CurrencyPipe that it is only supported in Chrome and Opera based browsers.
It says you can add a polyfil js library to fix the issue or use this npm package.
https://www.npmjs.com/package/intl
Will/can this be included by default in the next ionic release to make it easier to build iOS apps
Thanks