An easier way of doing things is to create an injectable params service as below. You can use this to pass params directly to a tab or multiple tabs rather than using the NavController. This is only meant to be a temporary solution until the issue is resolved.
// Require framework
import {Injectable} from "angular2/core";
@Injectable()
export class Params {
public params;
constructor () {
this.params = {};
}
}
Credit due here : http://stackoverflow.com/questions/35162308/ionic-2-passing-tabs-navparams-to-tab