What is the equivalent for ionViewDidEnter in directives?

Hi, I’m creating a directive and I need something like ionViewDidEnter for the directive. I know I can use the Angular2 events for that, but before I do that I would like to ask if there is something on Ionic side. That is my directive:

import {Component} from "@angular/core";
import {IONIC_DIRECTIVES} from "ionic-angular";

    selector: "round-slider",
    directives: [IONIC_DIRECTIVES],
    templateUrl: "build/pages/learning/components/round-slider/round.slider.html"
export class RoundSlider {
    // ionViewDidEnter???