NavController lifecycle events interfaces

Short description of the problem:

NavController’s lifecycle events should have interfaces.

What behavior are you expecting?

Provide interfaces, which compel us to implement the corresponding methods like OnInit in Angular2, in order to benefit from typing and editor tooling.

Which Ionic Version? 1.x or 2.x 2.x

[ysgk]

These interfaces assure that a component implements the hooks correctly; it eliminates the possibility of typos. Even if the methods should be renamed in the future, we could detect that change.

Besides, we could benefit from an IDE. Without these interfaces, we have to refer to the doc page to remember the name of the methods every time. But some IDEs are intelligent enough to suggest apposite candidates in an import sentence.

For example, we only have to type On in the curly brackets below to see the list of the lifecycle interfaces provided by Angular2: OnInit, OnChanges, and OnDestroy.

import { } from '@angular/core';

We only have to choose one of them and declare it in order to know which methods should be implemented if interfaces are provided.

I think it would be nice that ionic could provide such features. Thanks. 😃

[manucorporat]

@jvbianchi @fknop @ValterSantosMatos @ysgk please feedback!! https://github.com/driftyco/ionic/pull/10649