Angular 2: BehaviorSubject/Subject does not work outside constructor - ionic2

Question

Hi I need pass the data from one component to another, for this I am using the class BehavorSubject(I tried too with Subject class, but doesnt works for me). This is my code:
Home page has a filter, and when is selected a filter, it called the service and it service should change a variable of homePage
HomePage.ts
#Component({
providers: [PatientService],
})
export class HomePage {
subscription: Subscription;
constructor( public auth: AuthService,
public patientService: PatientService) {
this.subscription = this.patientService.nameGiven.subscribe(
nameGiven => {
this.patientsByElement = nameGiven.toString();
});
------ more code---
}
Filtro.ts
export class FiltroPage {
showFilter(filter : FiltroT): void{
... code ...
clearTimeout(this.timeout);
this.timeout = setTimeout(() => {
this.PatientService.getPatientsByTags(this.token,this.filterSelected);
} , 1000);
}
}
patient-service.ts
import { Subject } from 'rxjs/Subject';
import { Observable ,BehaviorSubject } from 'rxjs/Rx';
#Injectable()
export class PatientService {
nameSource = new BehaviorSubject("asd");
nameGiven = this.nameSource.asObservable();
this.nameSource.next('hi!!!'); //**it works but only in the constructor**
this.nameGiven.subscribe(()=>{
console.log("it changed");
});
getPatientsByTags(token: String, tags: Array<string>){
return new Promise(resolve => {
this.http.get(ConnectionParams.DevEnv + ProceduresNames.TagsByPatient + ProceduresNames.TagIdEtiqueta + tags, options)
.map(res => res.json())
.subscribe(data => {
if(data.data.poAnicuRegistros){
console.log("here")
this.nameSource.next('hi TON :/'); // <-- ***here is the problem. It doesnt work***
}
else
console.log("XX");
resolve( this.data);
});
});
}
}

Answer 1

Finally i didn't use the BehaviorSubject/Subject, i pass the data from the filter to Homepage of this way :
HomePage.ts
public popoverCtrl: PopoverController
//code ...
showFilter(myEvent) {
let popover = this.popoverCtrl.create(FiltroPage, {
showConfirm: (x) => {
//do something with the data received from the filter
}
});
popover.present({
ev: myEvent
});
}
Filter.ts
//code...
params: NavParams;
showConfirm() {// function that return the data to homePage
this.params.get('showConfirm')(this.patientsBytag);
}