Previously a css class generated from the JS class name, was
automatically being added to the page element. However, the JS class
name returned is not consistent among all browsers. Instead of
automatically applying a css classname, we now recommend adding a
`selector` to each page component.
BREAKING CHANGES:
- Overlay components, such as Alert or Modals, should now be created
using its injected provider.
- Overlays now have the `present()` method on the overlay’s instance,
rather than using `nav.present(overlayInstance)`.
- All overlays now present on top of all app content, to include menus.
- Below is an example of the change to `Alert`, but the pattern is the
same for all overlays: ActionSheet, Loading, Modal, Picker, Popover,
Toast
WAS:
```
import { NavController, Alert } from ‘ionic-angular’;
constructor(private nav: NavController) {
}
doAlert() {
let alert = Alert.create({
title: 'Alert',
});
this.nav.present(alert);
}
```
NOW:
```
import { AlertController } from ‘ionic-angular’;
constructor(private alertCtrl: AlertController) {
}
doAlert() {
let alert = this.alertCtrl.create({
title: 'Alert'
});
alert.present();
}
```
