ionViewCanEnter no work

[ionitron-bot]

Original issue by @davidoween on 2018-03-17T18:47:58Z

Ionic version: (check one with "x")
[ ] 1.x (For Ionic 1.x issues, please use https://github.com/ionic-team/ionic-v1)
[ ] 2.x
[x ] 3.x

I'm submitting a ... (check one with "x")
[x ] bug report
[ ] feature request
[ ] support request => Please do not submit support requests here, use one of these channels: https://forum.ionicframework.com/ or http://ionicworldwide.herokuapp.com/

Current behavior:
Before running the guard, load the page for a few moments

Expected behavior:
I should not load until I run guard.

Code:

async ionViewCanEnter(): Promise<any> {

    const token = await this.storage.get('token')

    if (token) {
      return true;
    }
    Observable.fromPromise(this.navCtrl.setRoot('LoginPage'));

  }

version of ionic is 3.2.0