title: Add custom loading animation Ionic 4
body: <p>I want to create a custom loading spinner for my ionic 4 app with a GIF or SVG animation. There is no "content" property to fill with html, so how do I replace the bubbles SVG in this case with a custom SVG or GIF?</p>
  
  <pre><code>async presentLoading() {
      const loading = await this.loadingController.create({
      spinner: 'bubbles',
      duration: 2000
      });
  return await loading.present();
  }
  </code></pre>