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Q:
How do you pass data from one view to another in Ionic applications?

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Ionic v.1 uses AngularJS and UI-router. It means you can use Angular services or UI-router’s state resolve to pass data from one view to another. Since Angular services are singletons, data stored in services can be accessed across other Angular controllers.

As mentioned, UI-router provides a resolve configuration. For example:

$stateProvider

  .state('todos', {

    url: '/todos',

    controller: 'TodosCtrl',

    templateUrl: 'todos.html',

    resolve: {

      todos: function(TodosService) {

        return TodosService.getTodos()

      }

    }

  })

One advantage of resolve over stateful services is better testing: as resolve injects dependencies in the controller, it is easy to test them.

When using Ionic v.4 you have 3 options:

Using Query Params (bad)

Service and Resolve Function (legit)

Using Router Extras State (new since Angular 7.2)

 openDetailsWithState() {

    let navigationExtras: NavigationExtras = {

      state: {

        user: this.user

      }

    };

    this.router.navigate(['details'], navigationExtras);

  }
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