ionic2 自定义返回按钮

<ion-navbar hideBackButton="true">

    <ion-buttons left>

      <button ion-button icon-only (click)="goBack()">

        <ion-icon ios="ios-arrow-back" md="md-arrow-back"></ion-icon>

      </button>

    </ion-buttons>

<ion-title>title</ion-title>

</ion-navbar>

goBack(){

        this.navCtrl.pop();

    }