Document Ionic root page & page navigation

[brodycj]

From #594 (comment) by @rodineijf:

Hi @brodybits, by default the attribution of rootPage on ionic 2 is on declaration of var rootPage. I can solve my problem moving the rootPage attribution to the platformReady on app.component

initializeApp() {
this.platform.ready().then(() => {

  this.rootPage = MyPage;
  StatusBar.styleDefault();
  Splashscreen.hide();
});
}

With a quick search I think the following resources may be relevant:

• https://www.joshmorony.com/a-simple-guide-to-navigation-in-ionic-2/
• https://www.gajotres.net/ionic-2-a-page-anatomy-part-1-the-root-component/
• https://forum.ionicframework.com/t/go-back-to-the-root-page-ionic-2-typescript/49861
• https://stackoverflow.com/questions/36664412/setting-root-page-in-ionic2-and-angular2-app-based-on-an-asynchronous-event

I think the root cause is the requirement to wait for the deviceready event in Cordova. This has been a stumbling block in so many cases and is especially bad for working with Ionic and other Angular apps.

[josebailo]

Totally true. Assigning the root page inside the platform ready event has fixed my problem with sqlite plugin.

I agree with @brodybits. I guess if you assign the root page before the platform ready event is fired, and you use the plugin inside the page, it crashes.

[tomaziMegys]

Actually, I'm getting this problem and was not solved by assigning the root page inside the platform ready. It just build with no erros sometimes, and if I get a error, a need to try saving many times 'til it builds it correctly. And no changes are made in the code to it simply work.

As example, I just tried to tap a "space" and save de project, the SQLite worked.
Few seconds after, I did the same, and the SQLite plugin acused the error.