This style gets messy very soon and you end up with huge Widget classesĪs explained above, the ViewModel has Input and Output parameters. Other dart projects cannot reuse the business logic since it’s intertwined with Flutter-dependent View logicģ. The problem is that view logic, view state, and business logic are mixed up. Without any specific architecture, the business logic and the current state are part of the widget. The button is disabled and the user sees an error if the email is invalid: Let’s look at an example – We’ll implement a Newsletter signup-form with an email textfield and a submit button. You don’t need to reinvent and write the logic twice. We can create a Mobile App and a website that both share the same ViewModel. It contains no dependencies to Flutter and can, therefore, be easily reused e.g. The ViewModel is totally platform-independent. The business logic sits in a separate ViewModel-class. In Flutter, the Widget represents the View of MVVM. It simply offers output states that the View observes: The ViewModel does NOT KNOW the View (a difference to forms of MVP and MVC). It is a humble view that simply renders the ViewModel’s output states. In contrast to popular MVC approaches the Fragment/Activity/UIViewController does not contain business logic in MVVM. button-clicks, text-changes, screen touches)
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