[feat] Allow for customizing the alert's dismissal

[iignatov]

Short description of the problem:

Currently it's not possible to configure Alert's dismissal although it's supported by the ViewController.

What behavior are you expecting?

To be able to pass NavOptions to Alert.dimiss() in order to configure how an alert is dismissed.

// https://github.com/driftyco/ionic/blob/2.0/src/components/alert/alert.ts
class AlertCmp {
  // ...
  dismiss(role: any): Promise<any> {
    return this._viewCtrl.dismiss(this.getValues(), role);
  }
  // ...
}

// https://github.com/driftyco/ionic/blob/2.0/src/components/nav/view-controller.ts
export class ViewController {
  //...
  dismiss(data?: any, role?: any, navOptions: NavOptions = {}) {
    let options = merge({}, this._leavingOpts, navOptions);
    return this._nav.remove(this._nav.indexOf(this), 1, options).then(() => {
      this._onDismiss && this._onDismiss(data, role);
      return data;
    });
  }
  // ...
}

Other information: (e.g. stacktraces, related issues, suggestions how to fix, stackoverflow links, forum links, etc)

https://forum.ionicframework.com/t/2-0-0-beta8-modal-animation-issue/54332

Which Ionic Version? 2.x

[jgw96]

Hello, thanks for opening an issue with us! This is actually already in the framework as you can see here. Thanks for using Ionic!