deviceReady how to

ionic-v1
4

Thank you jough but I still cant get it work:(

For example I have a controller:

.controller('infoCtrl', function($scope) {
  ionic.Platform.ready(function() {
    var device = ionic.Platform.device();
    alert(device.platform);
  });
});

and it returns undefined when I run it on iPhone.

p.s. I have installed org.apache.cordova.device and my config.xml is

<feature name="Device">
    <param name="ios-package" value="CDVDevice" />
</feature>