For those who are wondering why the sound does not work in the application with the ionic representation for the iOS device , but it works in the iOS emulator, like me:
The ion view app comes with a fixed set of cordova plugins. If your application needs a plugin that the ion viewer application does not support, your application will not work in the ion view application. The sound plugin that I used in the emulator was not supported in the application with an ionic representation.
Edit: a list of supported applications with ionic representation can be found here: http://docs.ionic.io/docs/view-usage
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