ionic LoadingController 模块使用

html 代码：

<ion-header>

  <ion-navbar>
    <ion-title>Loading</ion-title>
  </ion-navbar>

</ion-header>

<ion-content class="outer-content">

  <ion-list>
    <ion-list-header>
      Spinner Loading Indicators
    </ion-list-header>
    <button ion-item (click)="presentLoadingIos()">
      <ion-spinner item-start name="ios"></ion-spinner>
      Show iOS
    </button>
    <button ion-item (click)="presentLoadingDots()">
      <ion-spinner item-start name="dots"></ion-spinner>
      Show Dots
    </button>
    <button ion-item (click)="presentLoadingBubbles()">
      <ion-spinner item-start name="bubbles"></ion-spinner>
      Show Bubbles
    </button>
    <button ion-item (click)="presentLoadingCircles()">
      <ion-spinner item-start name="circles"></ion-spinner>
      Show Circles
    </button>
    <button ion-item (click)="presentLoadingCrescent()">
      <ion-spinner item-start name="crescent"></ion-spinner>
      Show Crescent
    </button>
    <button ion-item (click)="presentLoadingDefault()">
      <ion-spinner item-start></ion-spinner>
      Show Default
    </button>
  </ion-list>

  <ion-list>
    <ion-list-header>
      Custom Loading Indicators
    </ion-list-header>
    <button ion-item (click)="presentLoadingCustom()">
      Show Custom
    </button>
    <button ion-item (click)="presentLoadingText()">
      Show Text Only
    </button>
  </ion-list>

</ion-content>

<ion-footer>

  <ion-toolbar>
    <ion-buttons end>
      <button ion-button icon-end (click)="goToPage2()">
        Show Loading and Navigate
        <ion-icon name="arrow-forward"></ion-icon>
      </button>
    </ion-buttons>
  </ion-toolbar>

</ion-footer>

.ts 文件： 

import { Component } from '@angular/core';
import { LoadingController, NavController } from '../../../../../src';
import { PageTwo } from '../page-two/page-two';

@Component({
  templateUrl: 'page-one.html'
})
export class PageOne {
  constructor(public loadingCtrl: LoadingController, public navCtrl: NavController) {}

  presentLoadingIos() {
    let loading = this.loadingCtrl.create({
      spinner: 'ios',
      content: 'This is the "ios" spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingDots() {
    let loading = this.loadingCtrl.create({
      spinner: 'dots',
      content: 'This is the "dots" spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingBubbles() {
    let loading = this.loadingCtrl.create({
      spinner: 'bubbles',
      content: 'This is the "bubbles" spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingCircles() {
    let loading = this.loadingCtrl.create({
      spinner: 'circles',
      content: 'This is the "circles" spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingCrescent() {
    let loading = this.loadingCtrl.create({
      spinner: 'crescent',
      content: 'This is the "crescent" spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingDefault() {
    let loading = this.loadingCtrl.create({
      content: 'This is the mode specific spinner. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  presentLoadingCustom() {
    let loading = this.loadingCtrl.create({
      spinner: 'hide',
      content: `
        <div class="loading-custom-spinner-container">
          <div class="loading-custom-spinner-box"></div>
        </div>
        <div>This is a custom spinner. It will dismiss after 3 seconds.</div>`,
      duration: 3000
    });

    loading.present();
  }

  presentLoadingText() {
    let loading = this.loadingCtrl.create({
      spinner: 'hide',
      content: 'This has no spinner, only text. It will dismiss after 3 seconds.',
      duration: 3000
    });

    loading.present();
  }

  goToPage2() {
    let loading = this.loadingCtrl.create({
      content: 'This will navigate to the next page and then dismiss after 3 seconds.'
    });

    loading.present();

    setTimeout(() => {
      this.navCtrl.push(PageTwo);
    }, 1000);

    setTimeout(() => {
      loading.dismiss();
    }, 4000);
  }
}