Understanding @EnvironmentObject in SwiftUI

When and How to Use It

Photo by USGS on Unsplash

SwiftUI is a declarative approach to building UI for Apple programs (notably iOS and MacOS) that simplifies state management across views.

One way we can manage state is through the @EnvironmentObject property wrapper, as we can share data easily across multiple views without the repetitive passing of data through every view layer.

So here is what @EnvironmentObject is, when it should be used, and how it can streamline data handling in any given SwiftUI app,

What is it?

EnvironmentObject is a property wrapper (so a type that wraps a given value in order to attach additional logic to it) that enables sharing of data from an object stored in the SwiftUI environment so data can be shared across a wide range of views.

So data can be managed in a way that makes it accessible and observable by multiple views, such as user preferences or app sessions.

Why Use @EnvironmentObject?

When EnvironmentObject is injected into a parent view, all views referencing this object will automatically update when the object’s properties change.

This has several advantages.